House and renovation
Polymer resins and varnishes
What are polymer resins?
The resins are named after the reactions leading to their production: polymerization, polycondensation and polyaddition. Thus, polymer resins are produced by the polymerization method. In this chemical reaction, small monomers bind into macromolecules (giant particles) …
Epoxy resins and varnishes
What hardeners are most suitable for epoxy varnishes?
Polyamines are primarily used as hardeners for epoxy resin varnishes, polyamides and polyisocyanates. However, only such a hardener may be used, which the varnish producer requires. Only this one …
Electricity is the most convenient form of energy, therefore, the research on the possibility of obtaining it directly from solar radiation and the research hopes related to it are understandable. It is also a "clean" and safe method of producing electricity. Photovoltaic batteries, from energy sources …
Every house, also traditional, it should be tight. The tightness of the house protects its structure against the destructive effects of moisture condensed inside the external walls, from the air flowing outside the house. Airtightness in most European countries, also crucial for a passive house, is defined …
To which fire hazard class do the following solvents belong:
a) Spirytus należy do klasy zagrożenia pożarowego B, because it is soluble in water, and its flash point is below 294 K (21°C).
b) Turpentine is insoluble in water and has temperature …
Please explain, why the so-called. Universal thinners can dilute a wide variety of binders
The dissolving power of a solvent depends on the intermolecular forces in the solvent and the binder being dissolved. Both individual groups of solvents, and different binders have very different intermolecular forces. Universal thinners include …
Polyurethane resins and varnishes
How two-component polyurethane varnishes harden?
Two-component polyurethane varnishes harden by polyaddition, the hardener polyisocyanate is bonded to the main paint component.
Please describe the curing of the two-component polyurethane varnish
The main component of polyurethane varnish contains saturated polyesters …
Silicone resins and paints
Silicone paints contain as a binder, in addition to silicone resin, do 50% dispersion (relative to the binder content). What tasks does this dispersion additive fulfill??
Admittedly, silicone resins show, with very good gas permeability, optimal water repellency, but no …
Rodzaj cementu Nazwa
CEMI cement portlandzki
CEM II cement portlandzki żużlowy, Pozzolanic portland cement, ash portland cement, cement portlandzki krzemionkowy, limestone Portland cement, Slag-ash Portland cement
CEM III cement hutniczy
CEM IV cement pucolanowy
How the cement hardens?
The cement hardens through …
This concept describes the main facade of the building. It is characterized by this, that it is the most effective of all. Elevation, in question, to the facade. This is worth mentioning, that it is especially decorative. It often happens, that she has character …