CN105112004A - Low-viscosity organosilicone waterproof sealant for LED (Light Emitting Diode) surface-mounted screen and preparation method therefor - Google Patents
Low-viscosity organosilicone waterproof sealant for LED (Light Emitting Diode) surface-mounted screen and preparation method therefor Download PDFInfo
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- CN105112004A CN105112004A CN201510511404.1A CN201510511404A CN105112004A CN 105112004 A CN105112004 A CN 105112004A CN 201510511404 A CN201510511404 A CN 201510511404A CN 105112004 A CN105112004 A CN 105112004A
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Abstract
The invention relates to a low-viscosity organosilicone waterproof sealant for an LED (Light Emitting Diode) surface-mounted screen and a preparation method therefor. The low-viscosity organosilicone waterproof sealant contains a component A and a component B, wherein the component A contains hydroxyl-terminated organosiloxane, methyl-terminated organosiloxane, silicon dioxide, aluminum silicate, aluminum hydroxide and carbon black, and the component B contains methyl-terminated organosiloxane, organotin and organosiloxane containing mercapto, amino, ethoxy, vinyl and methylacryloyloxy. The low-viscosity organosilicone waterproof sealant for the LED surface-mounted screen, disclosed by the invention, is low in viscosity and good in leveling property and is free of sealant creeping. The low-viscosity organosilicone waterproof sealant also has the advantages of weather resistance, aging resistance, ultra-violet resistance and low shrinkage, so that the defects of the conventional LED in-line outdoor display screen pouring sealant are overcome. A long-term effective waterproof and dustproof protection is provided for LED outdoor surface-mounted display screens, and the low-viscosity organosilicone waterproof sealant has a flame-retardant effect.
Description
Technical field
The present invention relates to electron pouring sealant technical field, particularly a kind of for LED Surface Mount screen low viscosity organic silicon water-proofing seal gum, and preparation method thereof.
Background technology
Organosilicon is better than the high and low temperature resistance of most of material, weathering resistance and electrical insulation capability because of it, becomes the main Embedding Material of LED outdoor display screen.
But existing conventional organosilicon LED straight cutting outdoor display screen joint sealant has following defect: viscosity is large, levelling property is poor and need be added with white oil makees thinner.Further, because the lamp base of LED surface mounted light is low, lamp base large, cause the glue amount needing embedding fewer.And conventional LED straight cutting outdoor display screen joint sealant viscosity is large, levelling property is poor.And during embedding, LED Surface Mount screen periphery glue do not cover or because of viscosity large, LED Surface Mount screen periphery lamp base can cause Huaping phenomenon because climbing glue.
In addition, although the joint sealant viscosity being filled with white oil is low, white oil is inflammable, volatile, and silica gel shrinks large, and the contraction after long term operation will affect the water resistance of LED screen.
Therefore, for the problems referred to above, be necessary to propose further solution.
Summary of the invention
The object of this invention is to provide a kind of for LED Surface Mount screen low viscosity organic silicon water-proofing seal gum, and preparation method thereof, to overcome the deficiencies in the prior art.
For achieving the above object, the technical scheme of the low viscosity organic silicon water-proofing seal gum for LED Surface Mount screen provided by the invention is as follows:
Low viscosity organic silicon water-proofing seal gum for LED Surface Mount screen of the present invention comprises: component A and B component;
Described component A comprises: terminal hydroxy group organo-siloxane, terminal methyl organo-siloxane, silicon-dioxide, pure aluminium silicate, aluminium hydroxide and carbon black;
Described B component comprises: terminal methyl organo-siloxane, organotin and the organo-siloxane containing sulfydryl, amino, oxyethyl group, vinyl and methacryloxy.
As the improvement of the low viscosity organic silicon water-proofing seal gum for LED Surface Mount screen of the present invention, the ratio of quality and the number of copies of described component A and B component is 10:1.
As the improvement of the low viscosity organic silicon water-proofing seal gum for LED Surface Mount screen of the present invention, in described component A, the mass percent of each material is: terminal hydroxy group organo-siloxane 40 ~ 70%, terminal methyl organo-siloxane 30 ~ 50%, silicon-dioxide 5 ~ 15%, pure aluminium silicate 3 ~ 8%, aluminium hydroxide 5 ~ 15%, carbon black 0.1 ~ 0.8%.
As the improvement of the low viscosity organic silicon water-proofing seal gum for LED Surface Mount screen of the present invention, in described component A, the mass percent of each material is: terminal hydroxy group organo-siloxane 50%, terminal methyl organo-siloxane 30%, silicon-dioxide 7.5%, pure aluminium silicate 5%, aluminium hydroxide 7%, carbon black 0.5%.
As the improvement of the low viscosity organic silicon water-proofing seal gum for LED Surface Mount screen of the present invention, in described component A, described terminal hydroxy group organo-siloxane is terminal hydroxy group end-blocking polydimethylsiloxane, and described terminal methyl organo-siloxane is polydimethylsiloxane.
As the improvement of the low viscosity organic silicon water-proofing seal gum for LED Surface Mount screen of the present invention, the viscosity of described terminal hydroxy group end-blocking polydimethylsiloxane is 750 ~ 5000cst; The viscosity of described polydimethylsiloxane is 50 ~ 100cst.
As the improvement of the low viscosity organic silicon water-proofing seal gum for LED Surface Mount screen of the present invention, in described B component, the mass percent of each material is: terminal methyl organo-siloxane 64.8%, organotin 0.2%, the organo-siloxane 35% containing sulfydryl, amino, oxyethyl group, vinyl and methacryloxy.
As the improvement of the low viscosity organic silicon water-proofing seal gum for LED Surface Mount screen of the present invention, in described B component, the described organo-siloxane containing sulfydryl, amino, oxyethyl group, vinyl and methacryloxy comprises: tetraethoxy 28, tetraethoxy 40, KH151, KH570, KH792; Described organotin is dibutyl tin laurate.
As the improvement of the low viscosity organic silicon water-proofing seal gum for LED Surface Mount screen of the present invention, in described B component, by mass percentage: tetraethoxy 28 is 10%, tetraethoxy 40 is 15%, KH151 is 3%, KH570 is 3%, KH792 is 4%, polydimethylsiloxane is 64.8%, dibutyl tin laurate is 0.2%.
For achieving the above object, the technical scheme of the preparation method of the low viscosity organic silicon water-proofing seal gum for LED Surface Mount screen provided by the invention is as follows:
The preparation method of the low viscosity organic silicon water-proofing seal gum for LED Surface Mount screen of the present invention comprises the steps:
S1. terminal hydroxy group organo-siloxane, silicon-dioxide, pure aluminium silicate, aluminium hydroxide, carbon black are dropped in high speed dispersor, be incubated and continue dispersion, after being cooled to room temperature, adding terminal methyl organo-siloxane, obtain component A;
S2. put in sealed vessel by terminal methyl organo-siloxane, organotin and the organo-siloxane containing sulfydryl, amino, oxyethyl group, vinyl and methacryloxy, mix, after ageing, filtering throw out, obtains B component;
S3. by component A and B component mixing, low viscosity organic silicon water-proofing seal gum of the present invention is obtained.
As the improvement of the preparation method of the low viscosity organic silicon water-proofing seal gum for LED Surface Mount screen of the present invention, described step S1 specifically comprises:
By terminal hydroxy group organo-siloxane 50%, silicon-dioxide 7.5%, pure aluminium silicate 5%, aluminium hydroxide 7.5%, carbon black 0.5%, drop in high speed dispersor, rotating speed 1200rpm, keep material temperature 80 ~ 100 DEG C, continue dispersion 2h, after being cooled to room temperature, adding terminal methyl organo-siloxane 30%, obtain component A.
As the improvement of the preparation method of the low viscosity organic silicon water-proofing seal gum for LED Surface Mount screen of the present invention, described step S2 specifically comprises:
The KH151 of the tetraethoxy 40,3% of the tetraethoxy 28,15% by 10%, KH570, the KH792 of 4% of 3%, the polydimethylsiloxane of 64.8% and 0.2% dibutyl tin laurate put in sealed vessel, mix, after ageing 24h, filtering throw out, obtains B component.
Compared with prior art, the invention has the beneficial effects as follows: low, the good leveling property of low viscosity organic silicon water-proofing seal gum viscosity for LED Surface Mount screen of the present invention, do not climb glue.And it also has weathering resistance, ageing resistance, ultra-violet resistance, advantage that shrinking percentage is low, compensate for the defect of conventional LED straight cutting outdoor display screen joint sealant.For the outdoor surface welded display screen of LED provides permanently effective waterproof and dustproof protection, and there is flame retardant effect.
Particularly, seal gum of the present invention has cementability widely, can keep adhesive effect for a long time with base material.Seal gum of the present invention has excellent ageing resistance, weathering resistance, the advantage that life-time service waterproof sealing effect is good.Seal gum of the present invention has good mobility, can cover Surface Mount lamp base by free levelling within the operating time, and does not have and climb glue problem, and the bright coloured silk of LED is as one.Seal gum of the present invention has lower shrinking percentage, can available protecting electronic devices and components.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with embodiment, the present invention is described in more detail.Should be appreciated that, these describe just exemplary, and do not really want to limit the scope of the invention.In addition, in the following description, the description to known features and technology is eliminated, to avoid unnecessarily obscuring concept of the present invention.
A kind of low viscosity organic silicon water-proofing seal gum for LED Surface Mount screen of the present invention comprises: component A and B component.
Wherein, described component A comprises: terminal hydroxy group organo-siloxane, terminal methyl organo-siloxane, silicon-dioxide, pure aluminium silicate, aluminium hydroxide and carbon black; Described B component comprises: terminal methyl organo-siloxane, organotin and the organo-siloxane containing sulfydryl, amino, oxyethyl group, vinyl and methacryloxy.Preferably, the ratio of quality and the number of copies of described component A and B component is 10:1.
Described component A makes that low viscosity organic silicon water-proofing seal gum viscosity of the present invention is low, good leveling property, do not climb glue.Described B component makes low viscosity organic silicon water-proofing seal gum of the present invention have weathering resistance, ageing resistance, ultra-violet resistance, advantage that shrinking percentage is low.
In described component A, the mass percent of each material is: terminal hydroxy group organo-siloxane 40 ~ 70%, terminal methyl organo-siloxane 30 ~ 50%, silicon-dioxide 5 ~ 15%, pure aluminium silicate 3 ~ 8%, aluminium hydroxide 5 ~ 15%, carbon black 0.1 ~ 0.8%.As a kind of preferred implementation, terminal hydroxy group organo-siloxane 50%, terminal methyl organo-siloxane 30%, silicon-dioxide 7.5%, pure aluminium silicate 5%, aluminium hydroxide 7%, carbon black 0.5%.
In described component A, described terminal hydroxy group organo-siloxane is terminal hydroxy group end-blocking polydimethylsiloxane, and described terminal methyl organo-siloxane is polydimethylsiloxane.Wherein, the viscosity of described terminal hydroxy group end-blocking polydimethylsiloxane is preferably 750 ~ 5000cst; The viscosity of described polydimethylsiloxane is preferably 50 ~ 100cst.
Further, in described B component, the mass percent of each material is: terminal methyl organo-siloxane 64.8%, organotin 0.2%, the organo-siloxane 35% containing sulfydryl, amino, oxyethyl group, vinyl and methacryloxy.
Wherein, the described organo-siloxane containing sulfydryl, amino, oxyethyl group, vinyl and methacryloxy comprises: tetraethoxy 28, tetraethoxy 40, KH151, KH570, KH792; Described organotin is dibutyl tin laurate.By mass percentage: tetraethoxy 28 is 10%, tetraethoxy 40 is 15%, KH151 is 3%, KH570 is 3%, KH792 is 4%, polydimethylsiloxane is 64.8%, dibutyl tin laurate is 0.2%.
Be introduced the preparation method of the low viscosity organic silicon water-proofing seal gum for LED Surface Mount screen as above below, this preparation method comprises:
S1. terminal hydroxy group organo-siloxane, silicon-dioxide, pure aluminium silicate, aluminium hydroxide, carbon black are dropped in high speed dispersor, be incubated and continue dispersion, after being cooled to room temperature, adding terminal methyl organo-siloxane, obtain component A.
Particularly, described step S1 comprises: by terminal hydroxy group organo-siloxane 50%, silicon-dioxide 7.5%, pure aluminium silicate 5%, aluminium hydroxide 7.5%, carbon black 0.5%, drop in high speed dispersor, rotating speed 1200rpm, keep material temperature 80 ~ 100 DEG C, continue dispersion 2h, after being cooled to room temperature, add terminal methyl organo-siloxane 30%, obtain component A.Wherein, the object of carrying out high speed dispersion is, makes material heat up or heat.
S2. enter terminal methyl organo-siloxane, organotin and the organo-siloxane containing sulfydryl, amino, oxyethyl group, vinyl and methacryloxy in sealed vessel, mix, after ageing, filtering throw out, obtains B component.
Particularly, described step S2 comprises: the KH151 of the tetraethoxy 40,3% of the tetraethoxy 28,15% by 10%, KH570, the KH792 of 4% of 3%, the polydimethylsiloxane of 64.8% and 0.2% dibutyl tin laurate put in sealed vessel, mix, after ageing 24h, filtering throw out, obtains B component.
S3. by component A and B component mixing, low viscosity organic silicon water-proofing seal gum of the present invention is obtained.
Low viscosity organic silicon water-proofing seal gum for LED Surface Mount screen of the present invention in use, by component A, B with the mixing of 10:1 ratio, after mixing, carries out vacuum defoamation.Namely can be used for the embedding of the outdoor surface welded display screen of LED, waterproof and dustproof, fire-retardant, electrical isolation etc., thus can available protecting electronic devices and components.
Below in conjunction with specific embodiment, the preparation method to low viscosity organic silicon water-proofing seal gum of the present invention is further described.
Embodiment 1
Below by mass parts, be the terminal hydroxy group organo-siloxane of 750cst by 10 parts of viscosity, 30 parts of viscosity terminal hydroxy group organo-siloxane that is 1500cst, the 10 parts of viscosity terminal hydroxy group organo-siloxane that is 5000cst, 7.5 parts of fineness be 1250 order silicon-dioxide, 5 parts of pure aluminium silicate, 7.5 parts of aluminium hydroxides, 0.5 part of carbon black drop in high speed dispersor successively, rotating speed 1200rpm, keep material temperature 80 ~ 100 DEG C, continue dispersion 2 hours.Then be cooled to room temperature, add 30 parts of terminal methyl organo-siloxanes, obtain component A.
10 parts of tetraethoxys, 28,15 parts of tetraethoxys, 40,3 parts of KH151,3 parts of KH570,4 parts of KH792,64.8 parts of polydimethylsiloxanes, 0.2 part of dibutyl tin laurate are dropped in sealed vessel and mix, after ageing 24h, filtering throw out, obtains B component.
100g component A and 10g B component are mixed in plastic cup, stirs with glass stick.Vacuum defoamation 5 minutes again, obtains low viscosity organic silicon water-proofing seal gum of the present invention.
Test as follows for the low viscosity organic silicon water-proofing seal gum obtained, it is evenly poured in the outdoor surface welded display screen of a LED, at 25 DEG C, be cured in the environment of 52% relative humidity.Through observing, it keeps the shape that flows in 25min; After 40min, get final product surface cure, inner primary solidification; After 90min, intensity can be begun to take shape; After solidification 12h, this display screen gets final product work, and can play the effects such as waterproof and dustproof, fire-retardant, electrical isolation; After solidification 7h, low viscosity organic silicon water-proofing seal gum hardness reaches 15 ~ 20ShoreA, tensile strength >=1.0Mpa, volume specific resistance >=1.0 × 1014 Ω cm, dielectric strength >=10Kv/mm, flame retardant rating reaches ULHB level, and can work under-50 DEG C ~ 150 DEG C conditions for a long time and do not ftracture, efflorescence.
In sum, low, the good leveling property of low viscosity organic silicon water-proofing seal gum viscosity for LED Surface Mount screen of the present invention, do not climb glue.And it also has weathering resistance, ageing resistance, ultra-violet resistance, advantage that shrinking percentage is low, compensate for the defect of conventional LED straight cutting outdoor display screen joint sealant.For the outdoor surface welded display screen of LED provides permanently effective waterproof and dustproof protection, and there is flame retardant effect.
Should be understood that, above-mentioned embodiment of the present invention only for exemplary illustration or explain principle of the present invention, and is not construed as limiting the invention.Therefore, any amendment made when without departing from the spirit and scope of the present invention, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.In addition, claims of the present invention be intended to contain fall into claims scope and border or this scope and border equivalents in whole change and modification.
In addition, above reference embodiments of the invention have given explanation to the present invention.But these embodiments are only used to the object illustrated, and are not intended to limit the scope of the invention.Scope of the present invention is by claims and equivalents thereof.Do not depart from the scope of the present invention, those skilled in the art can make a variety of substitutions and modifications, and these substitutions and modifications all should fall within the scope of the present invention.
Claims (12)
1., for a low viscosity organic silicon water-proofing seal gum for LED Surface Mount screen, it is characterized in that, described low viscosity organic silicon water-proofing seal gum comprises: component A and B component;
Described component A comprises: terminal hydroxy group organo-siloxane, terminal methyl organo-siloxane, silicon-dioxide, pure aluminium silicate, aluminium hydroxide and carbon black;
Described B component comprises: terminal methyl organo-siloxane, organotin and the organo-siloxane containing sulfydryl, amino, oxyethyl group, vinyl and methacryloxy.
2. the low viscosity organic silicon water-proofing seal gum for LED Surface Mount screen according to claim 1, it is characterized in that, the ratio of quality and the number of copies of described component A and B component is 10:1.
3. the low viscosity organic silicon water-proofing seal gum for LED Surface Mount screen according to claim 1, it is characterized in that, in described component A, the mass percent of each material is: terminal hydroxy group organo-siloxane 40 ~ 70%, terminal methyl organo-siloxane 30 ~ 50%, silicon-dioxide 5 ~ 15%, pure aluminium silicate 3 ~ 8%, aluminium hydroxide 5 ~ 15%, carbon black 0.1 ~ 0.8%.
4. the low viscosity organic silicon water-proofing seal gum for LED Surface Mount screen according to claim 3, it is characterized in that, in described component A, the mass percent of each material is: terminal hydroxy group organo-siloxane 50%, terminal methyl organo-siloxane 30%, silicon-dioxide 7.5%, pure aluminium silicate 5%, aluminium hydroxide 7%, carbon black 0.5%.
5. the low viscosity organic silicon water-proofing seal gum for LED Surface Mount screen according to claim 1, it is characterized in that, in described component A, described terminal hydroxy group organo-siloxane is terminal hydroxy group end-blocking polydimethylsiloxane, and described terminal methyl organo-siloxane is polydimethylsiloxane.
6. the low viscosity organic silicon water-proofing seal gum for LED Surface Mount screen according to claim 5, it is characterized in that, the viscosity of described terminal hydroxy group end-blocking polydimethylsiloxane is 750 ~ 5000cst; The viscosity of described polydimethylsiloxane is 50 ~ 100cst.
7. the low viscosity organic silicon water-proofing seal gum for LED Surface Mount screen according to claim 1, it is characterized in that, in described B component, the mass percent of each material is: terminal methyl organo-siloxane 64.8%, organotin 0.2%, the organo-siloxane 35% containing sulfydryl, amino, oxyethyl group, vinyl and methacryloxy.
8. the low viscosity organic silicon water-proofing seal gum for LED Surface Mount screen according to claim 1, it is characterized in that, in described B component, the described organo-siloxane containing sulfydryl, amino, oxyethyl group, vinyl and methacryloxy comprises: tetraethoxy 28, tetraethoxy 40, KH151, KH570, KH792; Described organotin is dibutyl tin laurate.
9. the low viscosity organic silicon water-proofing seal gum for LED Surface Mount screen according to claim 8, it is characterized in that, in described B component, by mass percentage: tetraethoxy 28 is 10%, tetraethoxy 40 is 15%, KH151 is 3%, KH570 is 3%, KH792 is 4%, polydimethylsiloxane is 64.8%, dibutyl tin laurate is 0.2%.
10. a preparation method for the low viscosity organic silicon water-proofing seal gum for LED Surface Mount screen according to any one of claim 1-9, it is characterized in that, described preparation method comprises the steps:
S1. terminal hydroxy group organo-siloxane, silicon-dioxide, pure aluminium silicate, aluminium hydroxide, carbon black are dropped in high speed dispersor, be incubated and continue dispersion, after being cooled to room temperature, adding polydimethylsiloxane, obtain component A;
S2. put in sealed vessel by terminal methyl organo-siloxane, organotin and the organo-siloxane containing sulfydryl, amino, oxyethyl group, vinyl and methacryloxy, mix, after ageing, filtering throw out, obtains B component;
S3. by component A and B component mixing, low viscosity organic silicon water-proofing seal gum of the present invention is obtained.
The preparation method of the 11. low viscosity organic silicon water-proofing seal gums for LED Surface Mount screen according to claim 10, it is characterized in that, described step S1 specifically comprises:
By terminal hydroxy group organo-siloxane 50%, silicon-dioxide 7.5%, pure aluminium silicate 5%, aluminium hydroxide 7.5%, carbon black 0.5%, drop in high speed dispersor, rotating speed 1200rpm, keep material temperature 80 ~ 100 DEG C, continue dispersion 2h, after being cooled to room temperature, adding terminal methyl organo-siloxane 30%, obtain component A.
The preparation method of the 12. low viscosity organic silicon water-proofing seal gums for LED Surface Mount screen according to claim 10, it is characterized in that, described step S2 specifically comprises:
The KH151 of the tetraethoxy 40,3% of the tetraethoxy 28,15% by 10%, KH570, the KH792 of 4% of 3%, the polydimethylsiloxane of 64.8% and 0.2% dibutyl tin laurate put in sealed vessel, mix, after ageing 24h, filtering throw out, obtains B component.
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| CN201510511404.1A CN105112004A (en) | 2015-06-15 | 2015-08-19 | Low-viscosity organosilicone waterproof sealant for LED (Light Emitting Diode) surface-mounted screen and preparation method therefor |
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| CN201510333437 | 2015-06-15 | ||
| CN201510511404.1A CN105112004A (en) | 2015-06-15 | 2015-08-19 | Low-viscosity organosilicone waterproof sealant for LED (Light Emitting Diode) surface-mounted screen and preparation method therefor |
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| CN107663443A (en) * | 2017-07-15 | 2018-02-06 | 广东和天新材料科技有限公司 | A kind of low viscous fire-retardant Surface Mount casting glue of display screen |
| CN109777347A (en) * | 2018-12-29 | 2019-05-21 | 山东华夏神舟新材料有限公司 | Double component room temperature vulcanization fluorine silicone sealant and preparation method thereof |
| CN109971405A (en) * | 2019-04-24 | 2019-07-05 | 东莞圣堡达实业投资有限公司 | A kind of silicone sealant and its preparation method and application |
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| CN101768421A (en) * | 2010-01-29 | 2010-07-07 | 陈世龙 | Dual-component silicone sealant for solar photovoltaic components and preparation method thereof |
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| CN109777347A (en) * | 2018-12-29 | 2019-05-21 | 山东华夏神舟新材料有限公司 | Double component room temperature vulcanization fluorine silicone sealant and preparation method thereof |
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