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Temperature needed for carbon black dispersion and its effect on the color of coatings

2020-09-28 18:21:59
know carbon black What is the decomposition temperature of carbon black? At what temperature will carbon black start to decompose, and will storage carbon black decompose slowly? In this paper, we will solve a series of decomposition temperature problems of carbon black
What is the decomposition temperature range of carbon black production?
Usually, in air or oxygen, carbon black begins to decompose between 450 and 500 degrees Celsius. Carbon black does not decompose into nitrogen at the same temperature. The ash content of carbon black is usually tested at 550 ℃.
Will carbon black decompose when stored?
When stored in dry and sealed environment, carbon black is not easy to decompose and its shelf life is not limited. But as time goes on, carbon black will absorb water until it reaches equilibrium value. If the use of carbon black is important for moisture, it is recommended that carbon black be stored in a dry environment and sealed as far as possible.
How to study the decomposition temperature of carbon black
In general experiments, thermogravimetric analysis is used to study the decomposition temperature of carbon black, and thermogravimetric analysis method is used for carbon black. The conclusion of decomposition temperature analysis is: under the same heating rate, the larger the particle size, the higher the initial decomposition temperature of carbon black epitaxy; for the same carbon black, the faster the heating rate, the higher the initial decomposition temperature of carbon black epitaxy. In compound NBR / carbon black, the initial decomposition temperature of carbon black decreases with the increase of acrylonitrile NBR content. With the increase of carbon black content, the initial decomposition temperature of carbon black increases, but when the carbon black exceeds a certain value, the initial decomposition temperature of epitaxial carbon black is basically stable. In NBR / carbon black / other compounds, the initial decomposition temperature of carbon black is greatly affected by other complexing agents.
 
In recent years, due to the confusion of the pigment carbon black market, many users have spent a lot of time and energy on how to find a good use of pigment carbon black products. Terry has always maintained a stable quality, reasonable price, mutual benefit and win-win business philosophy, and has established a good brand image in the pigment carbon black market.
 
Does the performance of the pigment itself affect the coating? The answer is yes! But what are the main characteristics of the coating affected by pigment carbon black? It should be analyzed slowly according to the characteristics of carbon black itself. First of all, the original particle size of carbon black is the main reason. The effect of the original particle size on the properties of carbon black will not be repeated. In the coatings, the difference of the original particle size of carbon black has an effect on the coating. The smaller the original particle size is, the higher the blackness value is. On the contrary, the larger the original particle size is. Black, the blackness value is relatively low. This is also reflected in the relative coloring power. When making black coating, the original particle size of carbon black will also affect its dispersion. In the case of the same carbon particle size, the carbon black has a larger surface area than the carbon black. More importantly, when wetting, it takes longer, and it can be concluded that wettability is poor. Its dispersion and blackness will be better reflected when dispersing agent.
 
In order to form a stable dispersion system, it is necessary to have a sufficiently long solvated chain segment, that is to say, the dispersant should have a suitable molecular weight, so that the pigment carbon black particles will not re flocculate into large particles due to the collision caused by Brownian motion or prolong the time of flocculation and coarsening. Under the same formula conditions, the amount of pigment carbon black is large, and if the dispersant is not enough, it can not reach the best dispersion state, only pigment carbon black Only when the dosage of dispersant and dosage of dispersant are adjusted, can it be well dispersed and glossy.
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在保山酒店晚上怎么叫服务