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Environment-friendly LED lamp adhesive sealant and preparation method thereof
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A LED lamp, bonding and sealing technology, applied in the field of sealants, can solve the problems of yellowing, aggravated corrosion, easy yellowing, yellowing of the sealant surface, etc., and achieve good yellowing resistance, increased compatibility, and water absorption The effect of empowerment
Active Publication Date: 2016-10-05
兆舜科技(广东)有限公司
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Since ethyl acetoacetate and acetylacetone are easy to turn yellow at high temperature, most of the catalysts obtained when synthesizing bis(ethyl acetoacetate) diisopropyl titanate and bis(acetylacetonate) diisopropyl titanate are red Brown and yellow liquid, when used as an RTV catalyst, ethyl acetoacetate or acetylacetone will be released after solidification, which will cause the surface of the sealant to turn yellow; in addition, when they are used as a catalyst, due to their own structure, it is still necessary to add other amines for silanecoupling Adding agent to increase its adhesion to the material, resulting in aggravation of its yellowing and corrosion problems
[0004] However, titanate is used alone as a catalyst without the addition of amine silanecoupling agents and organotin catalysts. The system does not contain amino groups, ethyl acetoacetate, acetylacetone and other groups. This type of sealant has not been reported.
Method used
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[0049] (1) Add (α, ω)-dihydroxypolydimethylsiloxane and fillers into the dynamic mixer according to the amount, and stir and defoam for 3 to 10 hours at a temperature of 200 ° C and a vacuum of -0.08 MPa;
[0050] (2) After cooling down to room temperature, add a crosslinking agent, and stir and defoam for 30 minutes at a vacuum degree of -0.08MPa;
[0051] (3) Then add catalyst, stir and defoam under vacuum condition for 60 minutes.
[0056] (1) Add (α, ω)-dihydroxy polydimethylsiloxane and fillers into the power mixer according to the amount, and stir and defoam for 3 hours under the conditions of temperature 120°C and vacuum degree -0.03MPa;
[0057] (2) After cooling down to room temperature, add a crosslinking agent, and stir and defoam for 10 minutes at a vacuum degree of -0.12MPa;
[0058] (3) Then add the catalyst, stir and defoam under vacuum for 10 minutes.
[0063] (1) Add (α, ω)-dihydroxy polydimethylsiloxane and fillers into the dynamic mixer according to the amount, and stir and defoam for 10 hours at a temperature of 160°C and a vacuum of -0.14MPa;
[0064] (2) After cooling down to room temperature, add a crosslinking agent, and stir and defoam for 30 minutes at a vacuum degree of -0.03MPa;
[0065] (3) Then add catalyst, stir and defoam under vacuum condition for 60 minutes.
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Abstract
The invention relates to an environment-friendly LED (light emitting diode) lamp adhesivesealant and a preparation method thereof. The preparation method comprises the steps of adding filler to basic adhesive which is (alpha, omega)-dyhydroxy polydimethylsiloxane, defoaming, cooling to the room temperature, adding a cross-linking agent, and defoaming; and adding a catalyst, and defoaming to produce the environment-friendly LED lampadhesivesealant. The catalyst for the environment-friendly LED lamp adhesive sealant is an organic silicontitanium complex, the structural form of the complex is Ti[O(C3H6O)m(C2H4O)nH]a[OSi(CH3)2]hOSi(CH3)3](4-a), wherein a is an integer more than or equal to 0 and less than or equal to 3, and m, n and h are more than 50 and less than 1000. The prepared sealant has characteristics of no corrosion, good yellowing resistance, excellent adhesion property and the like.
Description
technical field [0001] The invention belongs to the technical field of sealants, and in particular relates to a sealant with no corrosion, good yellowing resistance and excellent cohesiveness, which is used for bonding and sealing LED lamp shades and bases. Background technique [0002] At present, most of the one-component dealcoholized RTV silicone rubbers used in the electronic industry are de-ethanol type, and a few are de-methanol type. The catalyst used in the ethanol removal type is a highly active amine compound such as diethylaminomethyltriethoxysilane or an organotin catalyst. Amino groups in amine compounds oxidize and turn yellow during use and cause corrosion; organotin catalysts (dibutyltin dilaurate, stannous octoate, etc.) Yellowing and corrosion of substrates. [0003] Since 2009, the European Union regulation REACH clearly prohibits the use of dibutyltin, dioctyltin and trisubstituted tin compounds. Most of the catalysts used in the market for demethanol...
Claims
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