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Common problem

FAQs

  • Why do two component silicone gel exhibit slow solidification and sticky phenomenon?

    Two component thin layer curing problem is a common phenomenon. There are two main reasons: 1. During the sizing process, the crosslinking agent in the colloid is easy to volatilize during the sizing process, resulting in the lack of crosslinking agent; 2. Because the amount of catalyst used in the two component silicone gel is less, the colloidal catalyst content after scraping is lower, resulting in the reaction can not be catalyzed and sticky. Phenomenon.

    There are two ways to solve this problem: 1, increase the content of crosslinking agent; 2, use a more active cross-linking agent with lower molecular weight, which can reduce volatilization and increase the content of catalyst.
  • How to use silane coupling agent in the preparation of silicone adhesive?

    The choice of silane coupling agent in silicone rubber still has great influence on the properties of the glue.

    Deacidification type silicone gel: acid adhesive uses less coupling agent. Now commonly used is D-11 Di tert butyl oxygen two acetoxy silane, which can improve the bonding property of acidic adhesive to metal.

    Deoxime silicone gel: commonly used silane coupling agents of ketoxime type are mainly LT-550, LT-560 and LT-792. Among them, LT-550 and LT-792 can enhance the adhesive and storage stability of the adhesive, LT-792 has better adhesion than LT-550, LT-550 is superior to LT-792 in storage stability and yellowing resistance, LT-560 can enhance the curing strength and curing speed of the adhesive, but excessive addition of coupling agent will affect the storage stability and yellowing resistance of silicone rubber.

    Dealcoholate silicone gel: commonly used silane coupling agents for alcohols are LT-171, LT-550, LT-560 and LT-792. Among them, LT-550 and LT-792 can improve the adhesive property of the adhesive and reduce the storage stability of the adhesive, and at the same time cause the yellowing of the adhesive. 171 and 560 can improve the curing speed and storage stability of the adhesive, but the increase of the adhesive property is limited.


  • Do methyl three butanone oxime silane and vinyl three butanone oxime silane need to be used at the same time?

    It is not necessary to use at the same time, but when used in practice, it is often used together. This is mainly due to methyl three butanone oxime silane and Vinyl three butanone oxime silane can play a complementary role in glue. Their respective advantages and disadvantages are as follows:

     

    Methyl three butanone oxime silane

    Vinyl three butanone oxime silane

    Advantage

    1.           It is not easy to yellowing.

    2.           Low price

    1.           Fast curing speed

    2.           It is not easy to crack.

    shortcoming

    One The curing speed is slow.

    One Yellowing

    Two The price is high.

     

  • Why does neutral transparent ketone oxime silicone gel slow down or solidify at low temperature?
    The main reason for this phenomenon is the low content of basic material 107. When the temperature is lower, the reaction activity of keto oxime crosslinking agent is also lower. At this time, the low content of 107 glue in low grade leads to the low reactivity of the whole glue, causing the middle part of the adhesive strip to not solidify or solidify very slowly. To solve this problem, it is suggested to start from two aspects:
    1, to improve the activity of crosslinking agents, methyl methyl butanone oxime silane, vinyl three butanone oxime silane and four butanone oxime silane should be mixed in different proportions according to needs, so as to enhance the reactivity of crosslinking agents.
    2, increase the content of 107 glue.
  • At low temperatures, the mixed deoxy - type crosslinking agent (D-91, D-31) causes white powder to appear on the bottom of the barrel.

    Four butanone oxime silane is solid at room temperature, and mixed deoxime type crosslinking agents all belong to the mixed solution product of four butanone oxime silane. When temperature is low, the phenomenon of four butanone oxime silane precipitates in powder form due to the solubility problem.

    The mixed deoxy - type crosslinking agent appeared to precipitate four butanone oxime silane, which must be heated before dissolving four butanone oxime silane.

     

  • Why is the product color gradually increased during the storage of keto oxime interlinking agent?
    The main reason is that the nitrogen group of ketoxime crosslinking agent will gradually become yellow when temperature is affected. Vinyl group three butanone oxime silane contains ethylene group, which will accelerate the yellowing phenomenon. Therefore, the ketone oxime cross-linking agent is easy to turn yellow in summer, especially in the presence of vinyl three butanone oxime silane for 2 months or so, the phenomenon of yellowing is obvious. Bobbi's gum is yellow.
  • Why is it easy to appear yellowing in porcelain white silica gel made from alcohol crosslinking agent?
    There are three main phenomena in the color yellow of alcohol porcelain white silica gel.
    1. During the storage process, the whole bottle / pail glue turns yellow. The main reason for this phenomenon is the quality of titanium complex.
    2. During storage, there is yellowing phenomenon on the bottom of the bottle or the surface of the barrel. The main reason is that the silicone rubber is not well sealed, resulting in skin formation. The solution is to solve the problem of skin sticking from controlling the moisture content of the base material, the amount of crosslinking agent, the sealing of the rubber bottle or the barrel.
    3. The surface of the silicone rubber is yellow after construction. This phenomenon is mainly caused by the addition of amino silane (such as KH550/792, etc.) in the preparation of silicone gel and the formation of amino groups after sunlight irradiation.
  • Why is the storage stability of dealcoholate silicone gel rather poor?

    There are many reasons for the poor storage stability of dealcoholate silicone gel, but there are two main reasons:

    1, the methanol produced in the silicone gel storage will produce an alkoxy terminated end to the 107 glue, which will eventually cause the 107 gel to lose its reactivity.

    2. Because of the high reaction activity, titanium complex can react easily or lose catalytic activity during storage.

  • Why does the dealcoholic silicone gel appear in the course of construction? How to reduce and avoid this kind of present?

    There are two internal and external reasons for the foaming phenomenon of alcohol silicone rubber.

    1, external causes: construction conditions, mainly due to excessive temperature difference or construction surface temperature too high.

    2, internal reasons: the dealcoholized silicone glue itself causes, because the dealcoholizing glue releases methanol in the curing process, and the boiling point of the methanol is low. Therefore, when the surface temperature of the construction is too high, the released methanol can not be volatilized in time and effectively, and it will form a bulge and bubble phenomenon in the interior of the colloid.

    The phenomenon of easy foaming of dealcoholic silicone rubber has not been completely solved. According to the vulcanization of the product, there are commonly used methods for reducing or reducing bubbling in the industry.

    1. Control the amount of crosslinking agent, because the more the addition of crosslinking agent, the greater the amount of methanol released, the easier it is to blister.

    2. Reduce the time of colloid drying, allowing the release of methanol to have sufficient time to evaporate.

    3. The use of methanol absorbent has not yet found a good absorbent.

    4. During construction, we mainly avoid exposure.

  • When using acid crosslinking agent to produce acid silicone rubber, the odour will be released, and even the symptoms of smoked eyes will appear.

    The main reason for producing odors is that during the production process, methyl three acetoxy silane react with 107 gum to release a large amount of acetic acid. Therefore, when using acidic crosslinking agents, workers must use labor protective equipment, such as protective glasses, masks and gloves. Acid crosslinker itself is not toxic, mainly irritating to skin and respiratory tract mucosa. Doing a good job of protection will not cause any harm to the human body.


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