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Dongguan Minz Rubber & Plastics Co., Ltd.

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Large-acting two-component condensation-type silicone for silicone sealing rings

Release time:

2019-05-13 12:30

Source:

Large-acting two-component condensation-type silicone for silicone sealing rings
 
Silicone sealing ring-- Small objects, large applications Silicone is favored because of its environmental performance, and is widely used in the production of various seals by Dongguan Silicone Products Factory.
 
Physical properties: 1. good elasticity, tear resistance, good resistance to neutral solvents;
2. Heat resistance: Silicone rubber has much better heat resistance than ordinary rubber
3. Cold resistance: ordinary rubber late for -20 °-30 °, that is, silicone rubber at -60 °-70 ° still has good elasticity, some special formula of silicone rubber can also withstand very low temperatures, such as: low temperature sealing ring;
4. Excellent resistance to ozone and oxide erosion;
5. Good insulation performance, heat insulation and heat dissipation performance.
 
silicone sealing ring performance:
1. It has high wear resistance, and has the function of automatic elastic compensation on the worn part of the working seal ring surface, thereby increasing the service life of the seal.
2. It has good self-lubricating performance, so it can be safely used in some seals that cannot be lubricated.
3. The characteristics of simple and convenient installation, because its construction is relatively simple compared to other types of seals.
4. It has good stretchability and compressibility, which enables the sealing ring to adapt to more working scenes.
High temperature resistance is another good performance, because in some working conditions often face high temperature environment.
 
Silicone sealing ring application areas:
1. All kinds of mobile phone protective cover, protective film, dust plug, USB cover, etc.
2. Conductive keys, part of insulating materials and conductive gaskets can be identified on the remote controllers of various electrical appliances in the home. All kinds of sealing strips and sealing rings; Electrical sockets and various products requiring flame retardant.
3. All kinds of kitchen utensils silicone spatula egg beater, etc.); Non-slip, heat-insulating gloves; Coaster, heat-insulating pad; Ashtray; Silicone cloth, silicone non-slip pad, massage pad are involved in, and other fields.
The old driver will take you to play with the mixing process of two-component condensed silica gel. The main agent and curing agent are used together according to the recommend weight ratio of the product A:B = 10:1 (the error is not more than 0.2): before use, the main agent and curing agent are fully stirred and mixed evenly, and the glue is mixed according to the specified ratio. Stir for 2-5 minutes at 1500-2000 r/min rpm.
 
The agitator should be placed slightly off the center of the liquid level, and the depth of the agitator inserted into the glue should be 1/22/3 of the glue height (based on the height from the liquid level). After stirring evenly, vacuum defoam the compound (if necessary) to completely remove the air bubbles and then potting. The A and B components of the opened package need to be resealed, otherwise the curing performance will be affected. Precautions Before use, check whether the package of agent B is damaged. If it is damaged, replace it to avoid use.
The main agent should be stirred evenly before use. Before the glue is cured, it should not be exposed to rain water, solvents, etc. If a matte finish is desired, the module must be placed in a well-ventilated environment.
 
Before using the same container for dispensing glue, the residue inside the container must be cleaned and the unused material must be resealed. When it is necessary to attach to a material (such as PC, PCB, etc.), it must be used after application experiments in advance. Depending on the situation at the time, it may be necessary to clean the material. In most cases, silicone rubber can be used normally between minus 40 and 200 degrees Celsius, but at higher or lower temperatures, in addition to higher requirements for adhesion or sealing materials, the curing performance of the glue itself has also changed. It can be used only after full testing.
 
How to avoid the generation of bubbles? It is recommend to use products with low viscosity and long operation time, so that the air can be discharged before the material is cured to keep the curing temperature below 45 ℃, so as to avoid the high temperature and the pores can not be discharged. How to determine the ratio? The amount of curing agent and the change of environmental temperature and humidity have a great influence on the curing speed. Increasing the amount of curing agent will accelerate the curing reaction. Therefore, the curing speed can usually be adjusted by increasing or decreasing the amount of the curing agent, and the general recommend amount is 10:0.8-10:1.2 (mass ratio).
 
If the proportion needs to be changed, it should be applied after a simple experiment. How to remove silica gel?
Before the glue cures, use a sharp knife (or a clean cotton wipe) to scrape off the uncured gel, and then use a solvent such as isopropyl alcohol to clean the remainder. After the glue is cured, you can first use a knife to scrape off as much silica gel as possible, and then use a solvent (120# solvent oil, alcohol, xylene and acetone, etc.) to remove various residues, soak and decompose it.
 
Higher fatty acid tin is one of the most commonly used catalysts for this reaction, in the presence of water will be hydrolyzed to alcohol and catalyze the rapid occurrence of the reaction, however, there is a reaction equilibrium in this process, under specific conditions: high temperature, closed, moisture or the presence of alcohol will occur the reverse reaction of the curing reaction, that is, reduction phenomenon.
 
How to deal with the settlement of the main agent? If the storage time is too long (more than half a month), the filler may settle. For example, if the component is opened, there is a layer of colorless and transparent silicone oil on the surface. If it is not stirred evenly, the surface color may be gray, the operation time is too long, the surface is sticky, the color of the cured product is gray, and the cured product is brittle. Therefore, the component needs to be stirred before use, especially up and down, and fully mixed.
 
Why is it that part of the glue is cured and part of the glue is not cured at the same time? The uneven mixing of glue will cause local curing to be slow or not cured. For example, the curing time of the glue prepared at the same time is inconsistent, some are cured faster, and some take a long time to cure. After curing, there are grooves on the surface of the glue, and the glue in the grooves is not cured. The phenomenon of complete non-curing appears locally. It is necessary to strengthen the stirring, the stirring time is about 2~5min, so that the glue is completely mixed and evenly. When using the stirring, it is necessary to pay attention to whether the stirring can drive all the glue.
In order to ensure that the LED glue on the PC shell, LED lamp and PCB board has good adhesion, the general use of ammonia coupling agent to improve adhesion, so placed for about 2 months, the curing agent color will turn yellow, does not affect the curing time and product performance. Can heat curing? condensation type product curing process, there are small molecules, so it is not suitable for heating curing.
 
Generally, it takes more than 12 hours for the product to be completely cured, and it is not suitable for heating and aging, otherwise it will be heated to accelerate the volatilization of small molecules and cause expansion. In addition, the curing temperature shall not exceed 45 ℃, and heating will accelerate the reaction, resulting in a large amount of ethanol gas in a relatively short period of time, resulting in a large number of bubbles or pores.
 
Common problems of dispensing machine component a must be stirred evenly before use before it can be injected into the barrel of dispensing machine component a. After the problem occurs, the customer can be required to carry out manual dispensing according to the operation specification of manual dispensing. If the glue can be cured normally, then find out whether the dispensing machine or matching is abnormal. When the machine is dispensing, check whether the rubber ratio of the two rubber tubes is accurate and whether there is precipitation in the curing agent barrel blocking the valve.
 
Clean the curing agent barrel and conduit; often replace the desiccant in the curing agent vent valve. Pay attention to whether the vent valve is open during gluing to avoid affecting the glue pressure. Newer dispensing machine comes with cleaning system, need to pay attention to when glue cleaning agent is clean.
                   

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