Do you know clear silicone sealant?

Clear silicone sealant is widely used in some occasions with high visual aesthetic requirements. At present, the clear silicone sealant on the market is mostly made of white carbon black as reinforcing agent and thixotropic agent, so the appearance is actually translucent, and the clear silicone sealant of ketone oxime occupies the main market of transparent glue. This is because the acetic acid released during the curing process of acidic clear glue has a pungent odor and is corrosive to many substrates. The alcohol clear adhesive uses titanium catalyst, which will affect the transparency. And can only use the end of 107 glue to do the base glue, the cost is high.

1.107 Effect of adhesive type on the properties of transparent adhesive

107 glue viscosity of the sealant strength, modulus, elastic elongation and fluidity have a certain impact: with the increase of 107 glue viscosity, sealant strength and elongation are getting higher and higher, the modulus gradually becomes smaller, the fluidity gradually becomes worse.

2.How to choose the right transparent glue?

In the joint of the glass plate, clear silicone sealant products are often used, but the effect is not satisfactory, usually transparent glue is presented as milky white after playing out.

At present, silicone clear glue on the market is divided into acidic clear glue and neutral transparent glue, which is more acidic than neutral transparency, can also be used for a long time to bubble water, mostly used in glass fish tank and other ornamental containers. However, acid glue can not be used for coated glass and laminated glass. Neutral transparent glue is generally used for glass plate joints.

3.Why does the sealant turn yellow?

Occasionally, the surface of the sealant turns yellow during use, mostly caused by "compatibility" problems.

Compatibility refers to the performance of the sealant and the material in contact with it will not have adverse physical and chemical reactions. In the actual use process, the sealant may be in contact with the sealing strip, rubber gasket, decorative tape and some waterproof materials, etc., these materials may be incompatible with silicone glue, resulting in discoloration of the glue surface. The most common incompatible materials are three ethylene propylene tape, gasket, etc., so when the sealant is in contact with other materials, it is necessary to submit the compatibility test in advance. At present, there are also special ternary ethylene propylene materials on the market can be compatible with silicone glue, in addition to the use of silicone material strip gasket, can also be compatible with silicone glue.

4.Why does the surface of sealant produce spot discoloration?

Many people think that the surface of the sealant produces spots and discolorations, and the sealant is "corroded". In fact, the acid mist and salt mist in the air will indeed cause some damage to the surface of the building glue, but silicone glue is a very superior rubber species in weather resistance, and it is not affected.

Generally, the spots on the surface of silicone rubber are mostly used when the acid detergent is used to clean the wall, and the cleaning agent is sprayed onto the surface of the sealant by mistake. Because the sealant contains calcium carbonate, it will react with the acid cleaning agent, resulting in reaction spots on the surface of the sealant.