Inorganic compounds is well known as effective foaming and nucleating agent for plastics such as PS, ABS, PE,PP and modified PPO.
Usual foaming agents are exothermic systems which liberate large amounts of heat during decomposition. This ordinarily leads to irregular cell structure. C-series is one of Inorganic which has endothermic decomposition characteristics. C-series is white, odorless, non-toxic and free-flowing powder and releases carbon dioxide and water vapor during thermal decomposition. It gives no incrustation against screw and hopper.
series meet FDA regulations and can be used for food stuffs.
Decomposition of Inorganic Foaming Agent
C-series is Sinno’s Inorganic Foaming Agent which decomposed endothermically. The decomposition range is 150-220℃. The use of activators is neither necessary nor possible. Decomposition only depends on the quantity of heat and processing condition, e.g.friction and pressure. It does not produce and ammonia odor but evolve only carbon dioxide and water vapor.And it only leaves white decomposition residue.
Technical indicators of Sinno’s C-series
|
Grade name
|
C#870
|
C#802
|
C#809
|
C#870MT
|
C#809MT
|
C#802MT
|
|
Chemical name
|
Specially coated sodium bicarbonate
|
Masterbatch of C
|
|
Appearance
|
Fine white powder
|
White granular
|
|
Decomposition temperature ℃
|
150～220
|
182～212
|
155～200
|
150～220
|
155～200
|
182～212
|
|
Gas volume（ml/g, at 25℃）
|
110～130
|
100～130
|
120～150
|
35-45
|
45～50
|
25～35
|
|
Average particle size（μm）
|
5.2～9.2
|
6.5～9.5
|
6.0-9.5
|
－
|
|
Solubility
|
Soluble in water and insoluble in organic solvents.
|
Applications
C-series allows smaller cells with regular distribution(by nucleating effect) and smooth surface(easy lacquer coating ) than AC. It is free from discoloring troubles.
C-series can be used in both extrusion and injection molding system. The recommended dosage level is 0.2-1.0% by weight. In practical usages, the processing temperature of 180-230℃ is suitable.
C-series can be also widely used as a nucleating agent to directly gas thermoplastics such as Polyolefines, Polystyrene, EVA and PVC using freon, pentane, butane, nitrogen and carbon dioxide. It will nucleate the high pressure gases into fine cellular structure in many different thermoplastics such as PS,ABS,PE,PP,and modified PPO by the processes of injection and extrusion system.