How to avoid bubbles?
Products with low viscosity and long operating time are recommended to allow air to be expelled before the material can cure. Keep the curing temperature below 45℃, avoid the temperature too high and cause the pores cannot be discharged
How to determine the ratio?
The amount of curing agent and the change of ambient temperature and humidity have great influence on curing speed. The increase of curing agent will accelerate the curing reaction. Therefore, the method of increasing and decreasing the amount of curing agent can usually be used to adjust the curing speed, and the recommended amount is 10:0.8-10:1.2 (mass ratio). If the proportion needs to be changed, it should be applied after simple experiment.
How to remove silica gel?
Before curing, use a sharp knife (or a clean cotton wipe) to scrape off the uncured gel, and then clean the residue with a solvent such as isopropyl alcohol. After curing, you can first use a knife to scrape off as much silica gel as possible, and then use solvents (120# solvent oil, alcohol, xylene and acetone, etc.) to remove various residues, soak and decompose it.
What is a restore and why is it a restore?
Tin fatty acid is one of the most commonly used catalysts for this reaction. In the presence of water, it will hydrolyze into alcohol and catalyze the rapid occurrence of this reaction. However, there is a reaction balance in this process.
What about the main agent settling?
If the placement time is too long (more than half A month), the packing may settle, such as group A separate bucket, the surface has A layer of colorless transparent silicone oil, if not evenly stirred may have surface color gray, long operation time surface sticky, curing product color gray, curing product brittle, etc. Therefore, before use, the A component should be stirred, especially up and down, and fully mixed.
Why will there be a part of solidified glue at the same time, a part of not solid?
Mixed glue is not uniform, will cause local curing slow or not curing. Such as: the same deployment out of the glue, the curing time is inconsistent, some faster curing, some to a long time to cure; After curing, there are grooves on the surface of the glue, and the glue in the groove is not cured; Local completely non - solidified phenomenon. Must strengthen the stirring, stirring time in about 2~5min, so that the glue is completely mixed evenly, the use of mixing must pay attention to whether the mixing can drive all the glue.
Curing agent yellow how to do?
In order to ensure that LED glue has good adhesion to PC shell, LED lamp tube and PCB circuit board, ammonia coupling agent is generally used to improve adhesion, so placed for about 2 months, curing agent color will turn yellow, does not affect the curing time and product performance.
What does the condensation product come out of?
Ethanol or propanol.
Can it be heated and cured?
Condensation product curing process, there are small molecules, so it is not suitable for heating curing. General products need more than 12 hours to complete curing, during which it is not appropriate to carry out heating aging, otherwise it will be heated to accelerate the volatilization of small molecules, resulting in expansion phenomenon; In addition, the curing temperature shall not exceed 45℃, heating will accelerate the reaction, resulting in a short time to produce a large number of ethanol gas, resulting in a large number of bubbles or pores.