PUCH series polyurethane high efficiency catalysts are classified as
PUCH-1 type, a purple-brown oily liquid.
PUCH-2 type, a dark purple oil-like viscous liquid.
PUCH-2 type has stronger catalytic activity than PUCH-1 type, and is more effective in use. The reference dosage of the two types is 0.05~2% of the total amount of polyurethane material (in the case of two-component polyurethane material, it means the total amount of the two components according to the sum of the use ratio).
Heavy calcium carbonate can be finely pulverized to achieve an average particle size of 2pm or less, or even 0.7pm or less. This type of calcium carbonate is called heavy fine calcium carbonate.
Generally, oil absorption, sedimentation volume, and specific surface area are used to distinguish various calcium carbonates. All kinds of calcium carbonate can be activated, and the activated calcium carbonate is called activated calcium carbonate.
Activated calcium carbonate is divided into two types based on different active agents: one type is activated calcium carbonate treated with stearic acid, calcium stearate, resin acid, rosin acid, polybutadiene, etc.; the other type It is activated calcium carbonate treated with melting ester coupling agent, phosphate coupling agent, silane coupling agent, etc. Due to different particle sizes and different surface treatment agents, various series of products are formed.
The physical properties of calcium carbonate are non-toxic, non-irritating, odorless, white, dry and soft powder without crystal water, and the hardness is No. 3 on the Mohs.
Calcium carbonate releases COg under the action of acid and forms soluble salts. It can be dissolved in acidic aqueous solution. When heated to 800~900℃, it releases CO and forms CaO. The thermal stability is about 550℃. The specific heat capacity of calcium carbonate It is 0.8~0.9J/g (0~100℃).
Calcium carbonate has basically no effect on plasticizers, stabilizers, lubricants and other additives. It is cheap, non-toxic, white in color, rich in resources, easy to mix in formulas, and relatively stable in nature (decomposes at 800°C), high whiteness It can partially replace expensive white pigments, so it is widely used as fillers and reinforcing materials in fire-resistant coatings, acting as skeletons, polyamide wax dispersion flame retardants and extender pigments. Calcium carbonate is used in fire-retardant coatings to increase the impact strength of the coating film and improve the toughness and elasticity of the fire-retardant coating: reduce shrinkage and have excellent color fastness; it can improve the surface quality of the fire-retardant coating; improve the stability and aging resistance.
In thick-coated fire-retardant coatings, calcium carbonate can thicken and thicken the coating, and play a role of filling and leveling. Therefore, light calcium carbonate is usually added to thick-coated fire-retardant coatings to reduce the ten-density of fire-retardant coatings. The amount of light calcium carbonate added can reach about 20%.
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