Acetylene carbon black

Acetylene carbon black has small particle size and high structure, high carbon content and very low volatile and ash content, so it is a good conductor of electric heating. It can be used as a reinforcing agent for conductive products. It has a medium level of reinforcement for rubber. The main characteristics of hardness and high heat generation are the good electrical and thermal conductivity of the donor compound. Acetylene black is good

Good electrical and thermal conductivity materials, widely used in dry batteries, electronic components, conductive rubber, conductor cable shielding materials, coatings, lubricants and other industries. Acetylene carbon black is well received by users at home and abroad due to its high liquid absorption, low specific resistance and good electrical conductivity.

Product nature and process description

Process Description

Acetylene carbon black is a carbon black obtained by continuous pyrolysis of 2-acetylene with a purity of more than 99% obtained from the by-product pulverization during the pyrolysis of calcium carbide. After heating the inside of the reactor to 800°C or more of the alkyne decomposition initiation temperature, the alkyne was introduced to start thermal decomposition. Since it is an exothermic reaction, the reaction can proceed automatically. In order to obtain stable quality, the reaction temperature should be kept around 1800C. The temperature in the furnace can be controlled by the water cooling jacket of the outer cylinder of the reaction furnace. Acetylene carbon black is used as the anode material of manganese F battery with manganese dioxide and electrolyte. Compared with furnace carbon black, its crystallization and secondary structure are more developed, so its conductivity and liquid absorption are also better. Due to less impurities such as heavy metals, the loss caused by self-discharge is small, and the storage performance is also better. Acetylene black has almost occupied the entire market in this field. It can be predicted that the demand for dry batteries will continue in the future.

Product Usage

1. Dry battery: Acetylene carbon black has good electrical conductivity and is widely used in the manufacture of dry batteries.

2. Lead-acid batteries, lithium batteries, lithium-ion batteries, etc. The particle size of acetylene carbon black is in the middle level, the structure is very high, and the ash and volatile content are very low, so the resistivity is very low. Acetylene carbon black for battery can improve the energy storage time of battery and prolong its service life. Conductive carbon black (35-40m) for high temperature cracking of acetylene, usually refers to the high performance carbon black obtained by cooling and collecting the purified Z acetylene gas after thermal cracking at high temperature isolated from air. , commonly known as acetylene black (Acetylene carbon black, ACET for short). Acetylene carbon black can be regarded as a kind of superconducting carbon black. Compared with the conductive carbon black of the oil furnace method, acetylene carbon black can reduce the loss of specific capacity of lithium batteries, and the price is cheap.

3. Conductive, anti-static rubber, silica gel and plastic, cable shielding material. As a functional highly conductive filler, conductive carbon black is mainly used in conductive and antistatic coatings, plastics, rubber, adhesives, inks, battery materials, cable shielding materials, etc. It is widely used in the fields of conduction, electromagnetic shielding and anti-static in various industries such as electronics, electromechanical, communication, printing, aerospace, weapons and so on.

4. Special tires and tire bladders. Acetylene carbon black can be used in tires to strengthen and conduct heat. The vulcanizate reinforced with it has high tensile strength and hardness and good physical properties.

5. Electromagnetic wave insulation and gas dispersion electrodes, catalyst materials, microwave absorbing materials. The microwave absorbing material is mainly composed of a wave absorbing agent and a matrix material. According to the working principle of the absorbing material, the absorbing ability of the absorbing material is closely related to the absorbing ability of the absorbing agent. Acetylene carbon black belongs to the inorganic wave absorbing material of electrical loss type, which has good wave absorbing function and is cheap.

Performance Indicator Notes

1. Apparent volume ml/g: the volume of a substance per unit weight. Unit ml/g. Experimental method: Pour the item into a 50ml volumetric flask, shake it slightly, weigh 50ml of solid matter, and then take it out and weigh it.

2. Iodine absorption value g/kg: Determination of iodine absorption value of carbon black is a common method for measuring the specific surface area of carbon black. Method: Infiltrate the quantitative carbon black sample with the iodine standard solution of the specified concentration and mix it thoroughly. After reaching the equilibrium, separate the carbon black and the iodine solution, and titrate the concentration of the iodine solution with sodium thiosulfate. Calculate the ratio of the amount of iodine adsorbed to the amount of carbon black, which is the iodine absorption value of carbon black.

3. Hydrochloric acid absorption m/g: According to the characteristics of Z-acetylene carbon black with developed structure, large volume and strong liquid absorption capacity, add excess hydrochloric acid to the sample, and after fully absorbing hydrochloric acid, apply a certain pressure and extrude it. The remaining amount of hydrochloric acid, the unextruded part is the amount of hydrochloric acid absorbed by the sample.

4. Resistivity QNaN: Resistivity is a physical quantity used to express the resistance characteristics of various substances. The resistance of a wire made of a certain material with a length of 1 meter and a cross-sectional area of 1 square meter at room temperature (20°C) is called the resistivity of this material. The unit of resistivity is ohm.meter (QNaN or ohmm), and the commonly used units are ohm-millimeter and ohm-meter.

5. pH value: The hydrogen ion concentration index (hydrogen ion concentration) refers to the ratio of the total number of hydrogen ions in the solution to the total amount of substances. Its value is commonly known as "pH value". A numerical value indicating the degree of acidity or alkalinity of a solution, that is, the negative value of the common logarithm of the concentration of hydrogen ions contained.

6. Heating weight loss %: Some substances are not pure and easy to absorb water. After heating, the active ingredients will be reduced, and the reduced amount is the heating weight loss.

7. Coarse particle %: Accurately weigh a certain amount of sample into a beaker, add a dilute solution of Z alcohol as a wetting agent, make it into a paste, pour it into a 150um (100 mesh) test sieve, and use Rinse with tap water. The residue left on the sieve is then dried and weighed as the coarse fraction.