Graphite powder, as an important industrial raw material and scientific research reagent, is highly susceptible to changes in its physical and chemical properties due to external environmental influences. Scientific preservation methods can not only extend the shelf life of graphite powder, but also ensure its performance stability in subsequent applications. The following provides a multidimensional explanation of the key points and operating procedures for storing graphite powder.

1、 Core elements of environmental control

1. Temperature and humidity management

The ideal storage temperature should be controlled between 15-25 ℃ to avoid high temperature accelerating oxidation reactions or low temperature causing lattice distortion. The relative humidity should be strictly maintained within the range of 40% -60%, and dynamic control can be achieved by using silica gel desiccant or electronic dehumidification equipment. A humid environment can promote the adsorption of water molecules on the surface of graphite, forming aggregates and reducing conductivity.

2. Light protection

Ultraviolet irradiation can easily trigger photocatalytic reactions in the interlayer structure of graphite, resulting in an increase in defect density. Opaque containers or aluminum foil composite packaging should be used and stored in a dark cabinet. If you need to open the window for observation, it is recommended to use anti UV glass material.

3. Cleanliness assurance

Dust particles in the air can contaminate the surface of graphite, affecting its performance in applications such as lubricants and battery electrodes. The storage area should meet the cleanliness standard of Class 10000, and operators should wear anti-static clothing and masks to avoid the mixing of human dander.

2、 Packaging Container Selection Strategy

1. Priority given to sealing

It is recommended to use double-layer PET/AL/PE composite film bags, with the inner layer of polyethylene providing basic barrier and the outer layer of aluminum foil shielding light and gas penetration. The sealing process adopts hot pressing technology, combined with vacuum packaging machine to extract air, and the residual oxygen content can be reduced to below 0.5%.

2. Inert gas filling

For high-purity graphite powder (≥ 99.9%), filling with nitrogen or argon can effectively suppress the oxidation reaction. The inflation pressure should be maintained in a slightly positive pressure state (about 0.05MPa) to prevent external air from infiltrating. Quarterly testing of gas purity and timely replenishment of losses.

3. Layered isolation design

Graphite powder with different particle size specifications should be packaged separately to avoid mixing of coarse and fine particles. When splitting large packaging into small dosage units, it should be operated in a clean workbench using sterile weighing tools.

3、 Storage and Access Standards

1. Principles of spatial layout

Maintain a distance of at least 30cm between the shelves and the wall, and elevate the bottom by 15cm to prevent moisture. Place heavy objects on the lower layer and light objects on the upper layer, with a single weight not exceeding 5kg to prevent crushing and damage. Establish a first in, first out management system and label the date of entry and batch number.

2. Access operation process

Before opening the packaging, wipe the outer surface with 75% ethanol for disinfection, and use a dedicated sampling spoon to take the required amount. Immediately seal the remaining materials and prohibit open exposure for more than 30 seconds. Tools that have been touched must be cleaned with ultrasonic waves before they can be used again.

3. Configuration of protective equipment

Operators must wear nitrile gloves, goggles, and dust masks, and disposable anti-seepage pads should be laid on the workbench. Waste packaging materials should be treated as hazardous waste and strictly prohibited from being discarded at will.

4、 Monitoring and maintenance system

1. Regular testing items

Monthly inspection of packaging integrity (no damage, air leakage) and discoloration of humidity indicator cards; Sampling and testing of specific surface area, pH value, and ash content every quarter, and recording the trend of data changes.

2. Exception handling plan

When clumping is found, it can be gently ground and dispersed with an agate mortar, and the use of metal instruments is prohibited. If the impurity content exceeds the standard, the entire batch needs to be scrapped and cannot be downgraded for use.

3. Information management

Establish an electronic ledger to record storage conditions, testing data, and usage records, and set up shelf life warnings (usually 12-24 months). Expired materials must be re inspected and qualified before they can continue to be used.

5、 Special scenario response measures

1. Protection during transportation

During long-distance transportation, double packaging of foam buffer box and corrugated carton shall be adopted, and the signs of "fragile" and "damp proof" shall be pasted. Ice packs should be added for temperature control during summer transportation, and attention should be paid to preventing freezing and cracking during winter.

2. Emergency Accident Handling

When there is a small amount of leakage, use a vacuum cleaner with a HEPA filter to collect it. If there is a large amount of spillage, use a wet mop to clean it. The sewage is filtered and recovered after sedimentation. It is strictly prohibited to directly pour into the sewer to cause blockage.

Through systematic preservation management, the microstructure and physicochemical properties of graphite powder can be effectively maintained, providing reliable guarantees for its applications in conductive fillers, heat dissipation materials, lithium-ion battery negative electrodes, and other fields. In practical operation, it is necessary to adjust parameters according to specific application scenarios and regularly train relevant personnel to master standardized operating procedures.