1, It can quickly catalyze the internal chemical curing reaction of polyurethane materials at room temperature and normal state, so that the overall curing and drying speed of polyurethane coatings, paints, adhesives, sealants and other materials can be greatly accelerated (many times faster than the currently used organic tin, lead and other catalysts), greatly shortening the construction time, avoiding rain, improving the efficacy and reducing the cost
2, Because the curing and drying chemical reaction is more complete, so that the overall curing performance of polyurethane materials has been improved, and the overall quality of the material has been fully guaranteed.
3, This type of catalyst has certain catalytic drying effect on other resin paints and coatings such as polyester and epoxy.
The main chemical components of dolomite powder are magnesium carbonate, calcium carbonate, molecular formula Mg COy·CaCO;, relative molecular mass 184.4. Dolomite powder is obtained by crushing and screening natural dolomite ore, and it is generally white, yellow or off-white. Dolomite is a composite carbonate of calcium and magnesium. Theoretically pure dolomite contains 45.7% Mg CO. and 54.3% Ca COs, and its hardness is 3.4~4.0. It is a crystalline trigonal system, usually containing dioxide Impurities such as silicon, black silica, clay, shale, and feldspar. Dolomite powder is made of finely ground dolomite. The standard of dolomite powder: 320 mesh sieving rate is 99%.
The dosage of dolomite powder in fire-resistant coatings is limited, and it is limited to use as a filler, mainly acting as a white pigment. Dolomite is a bicarbonate formed from denatured calcium and magnesium. Its CaMg(COs) content is 98%~99%, CaCO, 54%, Mg COa45.6%, A LzO; 0.03%, Fez O; 0.2%, pH 10, polyamide wax fabric specific surface area of 1~10m²/g, relative density of 2.85, oil absorption of 13~20g/100g powder, Mohs hardness of 3, application range of powdered dolomite and powdered calcium carbonate same. Dolomite has excellent wettability, dispersibility, medium absorption capacity for oil plasticizers, and high whiteness. However, because its solubility in water is higher than that of calcium carbonate, its weather resistance is worse than the latter. Because of its coarse particles, the refractive index is similar to the solvent of the paint, and its hiding power is weak, but dolomite is more abrasive to the machine than calcium carbonate. Much. Dolomite is used as a filler and reinforcing material in various fireproof coatings. It acts as a skeleton, flame retardant and extender pigment, and can improve the impact strength of the coating film.
Calcium carbonate Calcium carbonate is a non-toxic, odorless white powder. It is one of the most widely used inorganic fillers. Its molecular formula is Ca COs and its relative molecular mass is 100.09.
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