House and renovation
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 …
This element is made of a hard material. Nail, because that's what he's talking about, characterized by this, that the hand is sharpened, on the other hand, it resembles a flat head. The nail is an element, which is designed to combine various types of elements. Most often …
Although apparently, judging by the name, much has nothing to do with construction, when it comes to features, what it meets - it is very useful. Lumber, because that's what she's talking about, is a kind of wood assortment. It is created as a result of chafing the wood …
Chlorinated rubber paints
Which main solvents are contained in special thinners for chlorinated rubber paints?
Special thinners for chlorinated rubber paints mainly contain esters, ketones, chlorinated ethers and hydrocarbons.
What are the advantages and disadvantages of chlorinated rubber paints?
There are chlorinated rubber paints. especially resistant to chemicals …
Please indicate typical properties of alkyd varnishes. Properties of alkyd varnishes, especially flexibility, resistance to weather conditions, for scratches, Yellowing and heat resistance are oil dependent, and therefore the type and amount of fatty acids. On the whole, varnishes …
The development of the physicochemical properties of the leaven as it matures.
Physicochemical characteristics of the leaven in the maturation period: 1 – compressive strength. 2 – release of binding heat, 3 – degree of hydration, 4 – pH degree, 5 – conductivity.
The figure shows …
The effect of shallowness, temperature and humidity for the maturation process
The fineness has a very significant influence on the ripening process. The finer the grains, in the same volume of cement, there is a greater area of cement-water contact, and therefore a larger area, on which it takes place …
Heat of cement hydration
The setting of cements is an exothermic process, i.e., that heat is released during setting. The amount of heat released depends very much on the type of cement, but as a rule it is so big, that this phenomenon must be taken into account in many practical cases with …
Components of the internal structure of the hardened grout
When analyzing the internal structure of the ripe grout, it can be taken figuratively, that the cement stone is "micro-concrete” composed of:
• reliktów ziaren cementowych (meeting the aggregate roadstead),
• zhydratyzowanego cementu w postaci żelowokrystalicznej (the role of the binder),
• wody wolnej, because …