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Hot Melt edge sealant GSPK-D for insulated glazing

   
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GSPK-D Hot Melt sealant: a 21kg box The glass edge Hot Melt sealant GSPK-D is developed for application at production of glass units as an outer secondary sealant, to be applied after fastening glass with spacers. The Hot Melt technology includes heating of the compound and extrusion of its melt through a replaceable head of extrusion machinery's metering gun. The product is produced in form of black-coloured briquettes, each of them being of 7kg net weight, poured into a paperboard demountable box. 3 pieces are packed into transportation boxes as shown on the picture right above.
This standard form of HotMelt's container of 7kg net weight has been worked out by a Moscow company in June, 2005, and now it is used for packing in most cases (the second picture). If ordered, the Hotmelt may be poured into cylinders like the butyl sealant.
GSPK-D Hot Melt sealant: a 7kg box

The well-known advantages of one-component Hot Melt sealants are the following:

  • No preliminary components intermixing; lower cost of the material and Hot Melt extrusion device;
  • High adhesion to glass and to all types of spacers, not going down even in conditions of high humidity;
  • Rapidity of the sealants work. The ready package can be transported in a very small period after the sealing has been done (several minutes);
  • Absence of vulcanisation of the material with ageing in package that could cause solidification and loss of elastic and adhesion properties of the sealing;
  • A long shelf-life of the material - as a cool substance it is chemically inert and does not perceive oxidative ageing and ultraviolet radiation;
  • Bionomically favourable technology of production and application without any solid waste products, harmful outlet and gaseous exhausts.

These advantages are also mentioned and described more elaborately for example on the web-site of the insulated glazing company having a 40 years experience in this field, Ulmke Metals, Birmingham, UK.

Some of the specified advantages can be explained from chemical points of view. High adhesion to glass and spacers is certainly a key issue of the Hot Melts serviceability. The mechanism of the adhesion processes is complicated enough, and the explanation of it is usually based on general colloidal - chemical theories. In most cases it is considered that adhesion of substances is tangled up with forces of electrochemical intermolecular interaction of an adhesive and substrate. So, it is easy to understand that non-polar molecules of an adhesive (sealant) would not be capable to provide necessary interaction with polar surfaces of substrate. Therefore the sealing compound should necessarily contain in its composition some groups with charge displacement, which thus would be active and interact with the surface. It is considered that adherence to silicate glass with very small coarseness of the surface is caused by activity of exposed hydroxyl groups of the surface, which form connection with the charged groups of an adhesive due to forces of electrostatic interaction. Composition of the GSPK-D sealant includes special resins having chains with charge displacement mentioned above (containing so-called hetero-atoms), and that is the specific cause of the materials surface activity. If groups with charge displacement are not present, there is no adhesion to develop. A simple example one can try to stick melted polyethylene or any similar non-polar polymer to glass. It is impossible, the polymer will just drop down.

Processes of ageing vulcanisation - the phenomenon almost imminent for double-component materials. Cold vulcanisation results in an elastic substance to which all properties of rubber are peculiar, including ageing, no wonder. Routinely, these processes are stopped by special additives; it is impossible however, to kill them completely. Radical reactions of slow vulcanisation and crosslinking bonds formation result eventually in change of material properties, i.e. its solidification. Oppositely, to Hot Melt compounds this problem is not peculiar, since they are put from a melted condition, and the solidification means simple cooling down and the subsequent development of adhesion bonds. In other words, the sealant is not vulcanised in bed at all and as it contains only elastomers with a very small quantity of olefin bonds, its tendency to ageing is minimal. Despite of it, this material contains special additives preventing ozone surface cracking, oxygen and ultraviolet ageing, i.e. the necessary complex of stabilisers. Usually it is synthetic sterically hindered arene being a very active radical catcher. These compounds are capable to interrupt any radical reaction in the beginning and to prevent its further development.

The brief description and physical properties of the GSPK-D material

Hot Melt glass edge sealant GSPK-D - application instructions

   
 
Russia, Moscow, Entuziastov highway, 40, ph. +74959722742, e-mail info@hkv.ru
 
   

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