CN104017536A - High-transparency high-deep-layer-curing-speed double-component condensed organic silicon potting adhesive - Google Patents
High-transparency high-deep-layer-curing-speed double-component condensed organic silicon potting adhesive Download PDFInfo
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Abstract
The invention relates to a high-transparency high-deep-layer-curing-speed double-component condensed organic silicon potting adhesive which comprises a component A and a component B, wherein the component A comprises hydroxyl-terminated polydimethylsiloxane and low-viscosity hydroxy silicon oil; and the component B comprises a crosslinking agent, a chain extender, a coupling agent and a catalyst. Compared with the existing condensed technique, no water or water-containing substance is added into the two components, the low-viscosity hydroxy silicon oil is condensed and dehydrated under the action of the catalyst when the components A and B are mixed, and the water participates into the reaction between the crosslinking agent and hydroxyl-terminated polydimethylsiloxane, thereby finally forming the crosslinked body; and therefore, the potting adhesive provided by the invention avoids transparency decrease due to the addition of the water or water-containing substance, the light transmittance is up to 90% above, and meanwhile, the water molecules which are generated and uniformly released in the A and B reaction process can enable the quick deep layer curing of the whole system. The potting adhesive provided by the invention is applicable to potting electronic components, is especially suitable for integral potting of LED (light-emitting diode) lamp bars, and has higher assembly efficiency.
Description
Technical field
The present invention relates to a kind of Embedding Material, relate to specifically a kind of preparation and application of high transparent, two component condensed type organic silicon potting adhesives that deep layer curing speed is fast.
Background technology
In recent years, room temperature vulcanized liquid silicone rubber is with its excellent resistant of high or low temperature, moistureproof and waterproof, weathering resistance and electrical insulating property, and be extremely convenient to use technique, deeply be subject to the favor of glue for electronic apparatus, wind energy, sun power industry, generally for sealing and the embedding of LED, electronic devices and components, wind energy motor, photovoltaic module.Room temperature vulcanized liquid silicone rubber can be divided into single-component and two component according to packaging means, according to sulfuration mechanism, can be divided into condensed type and add-on type.Therefore, the main condensation of be divided into single-component, two component condensation and the two component addition three major types type of room temperature vulcanized liquid silicone rubber product in the market.
Because single-component condensed type silica gel can not deep layer solidify, dual composition addition type silica gel causes not solidifying without cementability and meeting when running into bump " poisoning ", and therefore the embedding of LED display module or lamp bar at present generally adopts two component condensed type silica gel.Transparent two component condensed type silicon rubber, not only cementability is good, can moistureproof and waterproof; Intuitively transparent, can see internal structure be convenient to maintenance; And transmittance is high, do not affect brightness.Given this, more and more LED assembly manufacturer selects two component condensed type transparent silica gel.But more two component condensed type transparent silica gel products are more or less also existing some shortcomings aspect transparency, deep layer curing speed and deep layer cured thickness, have affected quality and the production technique efficiency of subassembly product.Due to the curing mechanism of deep layer be in B component linking agent first by " water " be hydrolyzed then could with hydroxy-terminated polysiloxane crosslinking reaction, therefore many products add filler, the additive of micro-moisture or moisture content to carry out deep layer to solidify in A component; But siloxanes and moisture consistency extreme difference, the method that moisture adds directly causes transparency to decline.
The Introduction To Cn Patent of application number 200910239000 a kind of high-intensity pair of component condensed type transparent silica gel, through adding after synthetic voluntarily strengthening agent, the intensity of silicon rubber surpasses 8MPa, but deep layer curing speed and cured thickness are not significantly improved, and the synthesis technique of strengthening agent bothers and complexity; The Introduction To Cn Patent of application number 200910248012 can quick-setting pair of component condensed type transparent silica gel, in the A component of this glue, added amido silicon oil as promotor, accelerated crosslinking reaction, deep layer curing speed is promoted to some extent, but the easy xanthochromia of amido silicon oil, particularly be exposed to for a long time open air accept after temperature, damp and hot and ultraviolet test all the more so, thereby affect the outward appearance of assembly.
Summary of the invention
The object of the invention is: provide a kind of two component condensed type organic silicon potting adhesives of high transparent, deep layer quick solidifying, to overcome the deficiency of the transparent embedding of existing condensed type.
In order to realize foregoing invention object, technical scheme of the present invention is as follows: a kind of high transparent, two component condensed type organic silicon potting adhesives that deep layer curing speed is fast, comprise A component and B two-pack, and it is characterized in that,
Described A component by weight, comprises following component:
Hydroxyl-terminated injecting two methyl siloxane 100
Range of viscosities is 10～200cps low viscosity hydroxy silicon oil 2～10,
Described B component by weight, comprises following component:
Linking agent 10～40
Chainextender 40～80
Coupling agent 3～20
Catalyzer 2～15,
The weight ratio of A component and B component is 10:0.8～10:1.2, after mixing, assembly is carried out to embedding;
Wherein, the range of viscosities of described hydroxyl-terminated injecting two methyl siloxane is 500～20000cps;
Described linking agent is the silane crosslinkers containing three above alkoxy bases, at least comprises a kind of in ethyl polysilicate, tetraethyl silicate, methyl silicate, methyltrimethoxy silane, vinyltrimethoxy silane, vinyltriethoxysilane;
Described chainextender is at least one in dimethyldiethoxysilane, dimethyldimethoxysil,ne, vinyl methyldiethoxysilane;
Described catalyzer is at least one in dibutyl tin dilaurate, dibutyl tin acetate.
The principle of the invention is: the present invention does not add water or hydrate in A component, the substitute is and add a certain amount of low molecule hydroxy silicon oil, after the catalyzer of this material in running into B component, can first carry out condensation reaction, evenly discharge the water of molecular level, then water molecules participates in the reaction of hydroxyl-terminated injecting two methyl siloxane and linking agent, thereby impels colloid rapid deep zone to solidify.The embedding that guarantees any thickness assembly with this all can complete deep layer be solidified in 6 hours, and did not affect transparency.
By selecting the silane crosslinker of three above alkoxy bases, can regulate cross-linking density, thus the hardness of adjustment.Meanwhile, by selecting the linking agent of the alkoxy grp of different quantities and kind can also regulate curing speed.
Add chainextender can regulate the snappiness after colloid solidifies.
Catalyzer of the present invention is at least a kind of in dibutyl tin dilaurate, dibutyl tin acetate.Other organic tin catalyzer also can be realized same function, but considers corrodibility and activity, and the present invention selects above-mentioned two kinds of catalyzer.
Kind and the quantity that can adjust flexibly linking agent in B component, chainextender, catalyzer regulate operable time and curing speed.
Can realize bonding to different substrate materials by adjusting the kind of the coupling agent in B component and quantity.
When described hydroxyl-terminated injecting two methyl siloxane weight part is 100, other each components are specially:
Described range of viscosities is that 10～200cps low viscosity hydroxy silicon oil weight part is 2,3,4,5,6,7,8,9 or 10;
Described linking agent weight part is: 10,15,20,25,30,35 or 40;
Described chainextender weight part is: 40,45,50,55,60,65,70,75 or 80;
Described coupling agent weight part is: 3,7,10,13,17 or 20;
Described catalyst weight part is: 2,5,8,10,12 or 15.
On such scheme basis, for improving mobility, the range of viscosities of described hydroxyl-terminated injecting two methyl siloxane is 1500～5000cps.
On such scheme basis, in described A component, the hydroxy radical content scope of low viscosity hydroxy silicon oil is hydroxy silicon oil 2～10%.The low molecule hydroxy silicon oil that adds different viscosity, different hydroxy radical contents, not only can regulate the viscosity of A component, can also regulate mixed operating time and deep layer set time.The too low hydroxy radical content of hydroxy silicon oil viscosity is too high, and curing speed is excessively slow, affects operating efficiency, and the too high hydroxy radical content of viscosity is too low, and curing speed is too fast, has little time operation.
On such scheme basis, described coupling agent is for containing amino, chloro, epoxy group(ing), the organoalkoxysilane of acyloxy or isocyanato, as be at least: γ-aminopropyl triethoxysilane, γ-aminopropyltrimethoxysilane, N-β-aminoethyl-γ-aminopropyltrimethoxysilane, N-β-aminoethyl-γ-aminopropyl methyl dimethoxysilane, γ-chloropropyl triethoxysilane, γ-glycidyl ether oxygen base propyl trimethoxy silicane, γ-(methacryloxy) propyl trimethoxy silicane, isocyanic acid propyl-triethoxysilicane, N-(normal-butyl) a kind of in-3-aminopropyl trimethoxysilane.The adhesion properties of different coupling agents is had nothing in common with each other, and by selecting above-mentioned coupling agent, realizes effectively bonding to different substrate materials, plays effective water-tight effect.
Preparation technology of the present invention is: under normal temperature and pressure, hydroxyl-terminated injecting two methyl siloxane, low viscosity hydroxy silicon oil are mixed and make A component by weight 100:2～10, then packing; Linking agent, chainextender, coupling agent, catalyzer are mixed and make B component by weight 10～40:40～80:3～20:2～15, then packing.
The present invention is mainly used in embedding, the protection of electronic devices and components, is particularly useful for the whole embedding of LED lamp bar, LED display module, has the performances such as the excellent transparency, water-repellancy, moistureproofness, insulativity, resistance to xanthochromia, anti-aging.
The present invention compared with prior art possesses following advantage:
1. in the present invention, in A component, add low viscous hydroxy silicon oil, refractive index and the lipophilicity of this composition and base polymer are basically identical, and consistency is very good, does not add water and hydrate simultaneously, therefore do not affect high transparent, and transmittance reaches more than 90%;
2. the water molecules that relies on intermediate reaction to produce when A, B mix in the present invention is realized deep layer fast and is solidified, and is not subject to the restriction of embedding thickness;
3. production technique simple and feasible of the present invention, low-carbon energy-saving, and there is higher efficiency of assembling, be applicable to very much industrial production.
Embodiment
embodiment 1
The hydroxy silicon oil that is 6% by 5000cps hydroxyl-terminated injecting two methyl siloxane and hydroxy radical content mixes by weight the ratio of 100:2, stirs after 1 hour, and sealing is stand for standby use afterwards, is A component;
Ethyl polysilicate, dimethyldiethoxysilane, γ-aminopropyl triethoxysilane, dibutyl tin dilaurate are mixed by weight 25:40:10:15, stir after 1 hour, sealing, standing at least 1 hour, standby, be B component.
100gA component and 10gB component are put into plastic cup, with smooth clean iron chopsticks, stir 2 minutes, then vacuum defoamation 3 minutes, and in rapid embedding to LED lamp bar and a LED module, and sample is placed on to 25 ± 3 ℃, in the thermostatic constant wet chamber of RH55 ± 5%, after 3h, deep layer is solidified completely, transmittance 95%.
embodiment 2
The hydroxy silicon oil that is 8% by 1500cps hydroxyl-terminated injecting two methyl siloxane and hydroxy radical content mixes by weight the ratio of 100:3, stirs after 1 hour, and sealing is stand for standby use afterwards, is A component;
Tetraethyl silicate, dimethyldimethoxysil,ne, N-β-aminoethyl-γ-aminopropyltrimethoxysilane, dibutyl tin acetate are mixed by weight 30:50:5:2, stir after 1 hour, sealing, standing at least 1 hour, standby, be B component.
100gA component and 10gB component are put into plastic cup, with smooth clean iron chopsticks, stir 2 minutes, then vacuum defoamation 3 minutes, and in rapid embedding to LED lamp bar and a LED module, and sample is placed on to 25 ± 3 ℃, in the thermostatic constant wet chamber of RH55 ± 5%, after 6h, deep layer is solidified completely, transmittance 94%.
embodiment 3
The hydroxy silicon oil that is 10% by 500cps hydroxyl-terminated injecting two methyl siloxane, 6000cps hydroxyl-terminated injecting two methyl siloxane and hydroxy radical content mixes by weight the ratio of 20:80:8, stirs after 1 hour, and stand for standby use after sealing, is A component;
Methyltrimethoxy silane, dimethyldiethoxysilane, γ-chloropropyl triethoxysilane, dibutyl tin acetate are mixed by weight 10:80:15:6, stir after 1 hour, sealing, standing at least 1 hour, standby, be B component.
100gA component and 10gB component are put into plastic cup, with smooth clean iron chopsticks, stir 2 minutes, then vacuum defoamation 3 minutes, and in rapid embedding to LED lamp bar and a LED module, and sample is placed on to 25 ± 3 ℃, in the thermostatic constant wet chamber of RH55 ± 5%, after 5h, deep layer is solidified completely, transmittance 96%.
embodiment 4
The hydroxy silicon oil that is 8% by 1500cps hydroxyl-terminated injecting two methyl siloxane, 20000cps hydroxyl-terminated injecting two methyl siloxane, hydroxy radical content mixes by weight the ratio of 50:50:3, stirs after 1 hour, and stand for standby use after sealing, is A component;
Vinyltriethoxysilane, vinyl methyldiethoxysilane, γ-glycidyl ether oxygen base propyl trimethoxy silicane, dibutyl tin dilaurate are mixed by weight 20:60:10:10, stir after 1 hour sealing, standing at least 1 hour, standby, be B component.
100gA component and 10gB component are put into plastic cup, with smooth clean iron chopsticks, stir 2 minutes, then vacuum defoamation 3 minutes, and in rapid embedding to LED lamp bar and a LED module, and sample is placed on to 25 ± 3 ℃, in the thermostatic constant wet chamber of RH55 ± 5%, after 5h, deep layer is solidified completely, transmittance 93%.
embodiment 5
The hydroxy silicon oil that is 8.5% by 1500cps hydroxyl-terminated injecting two methyl siloxane, hydroxy radical content mixes by weight the ratio of 100:3, stirs after 1 hour, and stand for standby use after sealing, is A component;
By tetraethyl silicate, dimethyldiethoxysilane, γ-(methacryloxy) propyl trimethoxy silicane, N-(normal-butyl)-3-aminopropyl trimethoxysilane, dibutyl tin dilaurate mix by weight 35:40:10:5:10, stir after 1 hour, sealing, standing at least 1 hour, standby, be B component.
100gA component and 10gB component are put into plastic cup, with smooth clean iron chopsticks, stir 2 minutes, then vacuum defoamation 3 minutes, and in rapid embedding to LED lamp bar and a LED module, and sample is placed on to 25 ± 3 ℃, in the thermostatic constant wet chamber of RH55 ± 5%, after 3h, deep layer is solidified completely, transmittance 95%.
Claims (5)
1. high transparent, two component condensed type organic silicon potting adhesives that deep layer curing speed is fast, comprise A component and B two-pack, it is characterized in that,
Described A component by weight, comprises following component:
Hydroxyl-terminated injecting two methyl siloxane 100
Range of viscosities is 10～200cps low viscosity hydroxy silicon oil 2～10,
Described B component by weight, comprises following component:
Linking agent 10～40
Chainextender 40～80
Coupling agent 3～20
Catalyzer 2～15,
The weight ratio of A component and B component is 10:0.8～10:1.2, after mixing, assembly is carried out to embedding;
Wherein, the range of viscosities of described hydroxyl-terminated injecting two methyl siloxane is 500～20000cps;
Described linking agent is the silane crosslinkers containing three above alkoxy bases, at least comprises a kind of in ethyl polysilicate, tetraethyl silicate, methyl silicate, methyltrimethoxy silane, vinyltrimethoxy silane, vinyltriethoxysilane;
Described chainextender is at least one in dimethyldiethoxysilane, dimethyldimethoxysil,ne, vinyl methyldiethoxysilane;
Described catalyzer is at least one in dibutyl tin dilaurate, dibutyl tin acetate.
2., two component condensed type organic silicon potting adhesives that deep layer curing speed fast transparent according to the height described in right 1, is characterized in that, the range of viscosities of described hydroxyl-terminated injecting two methyl siloxane is 1500～5000cps.
3., two component condensed type organic silicon potting adhesives that deep layer curing speed fast transparent according to the height described in right 1, is characterized in that, in described A component, the hydroxy radical content scope of low viscosity hydroxy silicon oil is 2～10%.
4. transparent according to the height described in right 1, two component condensed type organic silicon potting adhesives that deep layer curing speed is fast, it is characterized in that, described coupling agent is at least: γ-aminopropyl triethoxysilane, γ-aminopropyltrimethoxysilane, N-β-aminoethyl-γ-aminopropyltrimethoxysilane, N-β-aminoethyl-γ-aminopropyl methyl dimethoxysilane, γ-chloropropyl triethoxysilane, γ-glycidyl ether oxygen base propyl trimethoxy silicane, γ-(methacryloxy) propyl trimethoxy silicane, isocyanic acid propyl-triethoxysilicane, N-(normal-butyl) a kind of in-3-aminopropyl trimethoxysilane.
5. according to the purposes of the two component condensed type organic silicon potting adhesives that height is transparent, deep layer curing speed is fast described in any one of right 1 to 4, for the embedding of electronic devices and components, at least for comprising the whole embedding of LED lamp bar, LED display module.
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| CN113684003A (en) * | 2021-09-03 | 2021-11-23 | 广州市白云化工实业有限公司 | Bi-component room temperature vulcanized silicone rubber composition |
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Application publication date: 20140903 |