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Anti-aging organic silicon pouring sealant and preparation method thereof

A silicone potting and anti-aging technology, applied in the direction of adhesives, adhesive additives, non-polymer adhesive additives, etc., can solve the problems of easy yellowing, affecting the service life, aging, etc. effect, the effect of improving thermal stability and photostability

Inactive Publication Date: 2022-03-08
陈文娟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silicone potting adhesive is exposed to sunlight, high temperature and other conditions for a long time, it is easy to yellow and age, which will affect the service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Prepare the filling:

[0032] Under the condition of nitrogen protection, mix p-aminodiphenylamine and absolute ethanol, then add 3-glycidyl etheroxypropyltriethoxysilane and 50mL absolute ethanol, react at a constant temperature of 80°C for 12h, and concentrate under reduced pressure after the reaction Remove the solvent to obtain a modifier; the molar ratio of p-aminodiphenylamine and 3-glycidyloxypropyl triethoxysilane is 1:1.2; absolute ethanol is used as a solvent;

[0033] Disperse white carbon black in aqueous ethanol solution, adjust the pH value to 4 with acetic acid solution, then add a modifier, and react at 60°C for 4 hours; after the reaction is completed, cool the obtained suspension to room temperature, separate by centrifugation and use Washed three times with absolute ethanol, and dried in an oven at 80°C to obtain the filler. The volume fraction of ethanol aqueous solution is 90%, and the dosage ratio of white carbon black, ethanol aqueous solution an...

Embodiment 2

[0035] Preparation aids:

[0036] Step S11, mixing 1,2,2,6,6-pentamethylpiperidinol, sodium hydroxide, methyltrioctylammonium chloride and toluene, stirring at 20°C for 10 minutes, and then mixing three Polycyanogen chloride was dissolved in toluene and added. After the addition, the temperature was raised to 40°C, stirred for 4 hours, filtered after the reaction, and the filtrate was washed with saturated brine. After washing, it was dried with anhydrous magnesium sulfate, and then concentrated under reduced pressure to remove the solvent. , to obtain intermediate 1; wherein, the molar ratio of 1,2,2,6,6-pentamethylpiperidinol, cyanuric chloride, sodium hydroxide and methyl trioctyl ammonium chloride is 0.022:0.01: 0.025:0.1; toluene as solvent,

[0037] Step S12, at a temperature of 0°C, mix intermediate 1 with acetone, then dissolve ethanolamine in acetone and add, then add sodium hydroxide, keep the temperature constant after adding, continue to stir for 2 hours, and use ...

Embodiment 3

[0040] Preparation aids:

[0041]Step S11, mixing 1,2,2,6,6-pentamethylpiperidinol, sodium hydroxide, methyltrioctylammonium chloride and toluene, stirring at 20°C for 10 minutes, and then mixing three Polycyanogen chloride was dissolved in toluene and added. After the addition, the temperature was raised to 40°C, stirred for 4 hours, filtered after the reaction, and the filtrate was washed with saturated brine. After washing, it was dried with anhydrous magnesium sulfate, and then concentrated under reduced pressure to remove the solvent. , to obtain intermediate 1; wherein, the molar ratio of 1,2,2,6,6-pentamethylpiperidinol, cyanuric chloride, sodium hydroxide and methyl trioctyl ammonium chloride is 0.022:0.01: 0.025:0.1; toluene as solvent,

[0042] Step S12, at a temperature of 10°C, mix Intermediate 1 with acetone, then dissolve diethanolamine in acetone and add, then add sodium hydroxide, keep the temperature constant after the addition, continue stirring for 2 hours,...

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Abstract

The invention relates to an anti-aging organic silicon pouring sealant and a preparation method thereof, and belongs to the technical field of organic silicon pouring sealants, and the preparation method comprises the following steps: mixing alpha, omega-dihydroxy polydimethylsiloxane and an auxiliary agent, uniformly stirring in vacuum, then adding an alkaline additive, continuously stirring, adding an acidic additive, continuously stirring, adding a curing agent, and uniformly stirring to obtain the anti-aging organic silicon pouring sealant. Adding a filler, performing vacuum dehydration, then adding dimethyl silicone oil, a cross-linking agent and a tin catalyst, and continuously stirring under a vacuumizing condition, so as to obtain the product. By adjusting the raw materials, the heat stability and light stability of the organic silicon pouring sealant are improved, and the anti-aging effect of the organic silicon pouring sealant is further improved. And the auxiliary agent reacts with alpha, omega-dihydroxy polydimethylsiloxane to terminate the alpha, omega-dihydroxy polydimethylsiloxane, and groups with light stability are combined with flame-retardant groups, so that the stability of the product is improved. By adding the filler, the mechanical property of the organic silicon pouring sealant can be improved.

Description

technical field [0001] The invention belongs to the technical field of silicone potting glue, and in particular relates to an anti-aging silicone potting glue and a preparation method thereof. Background technique [0002] Potting is the process of rationally arranging, assembling, connecting, and isolating and protecting electronic components from the environment. The function of potting is to strengthen the integrity of electronic components, improve the resistance to external damage, improve the insulation of internal circuits, and improve the waterproof and moisture-proof performance of electronic components. [0003] There are three main types of silicone potting compounds commonly used, namely one-component RTV silicone rubber, two-component condensation RTV silicone rubber and two-component addition RTV silicone rubber. Silicone potting adhesive is exposed to sunlight and high temperature for a long time, and it is easy to yellow and age, which will affect the servic...

Claims

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Application Information

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IPC IPC(8): C09J183/04C09J11/06C09J11/04
CPCC09J183/04C09J11/06C09J11/04C08L2201/08C08L2203/206C08K9/06C08K7/26C08K5/3492
Inventor 不公告发明人
Owner 陈文娟
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