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Shandong Intek New Material Company:What are the precautions in the use of sealant?
Time:2022-08-08

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Precautions in the use of sealant:


1. Surface treatment

The surface with more oil dirt shall be cleaned with solvent. Small parts can be soaked in solvent and then wiped with clean cotton yarn; For large surfaces, clean cotton yarn dipped in solvent can be used to wipe. When wiping, wipe it one by one in one direction instead of back and forth. If it is not wiped for the first time, replace the cotton yarn and wipe it again until it is clean; The wiped surface shall be allowed to stand for at least 10-20min to volatilize the solvent before applying glue. If the adhesive cannot be applied for a long time, the surface shall be covered with clean plastic film to avoid re pollution.


2. Preparation and storage of sealant

Operators must carefully read the performance and operation instructions of sealant in advance, and operate and store the sealant in strict accordance with the specified requirements.

For the two-component sealant, the glue shall be weighed and mixed according to the specified proportion of components a and B. the amount of glue shall be determined according to the applicable period of the glue and the heat release of the glue. For the glue with a long application period, more can be prepared each time to improve the work efficiency; For the glue with severe heat release after mixing (such as epoxy resin glue with low molecular aliphatic amine as curing agent), the amount of glue shall not be too large, and the glue mixing tools with good thermal conductivity such as copper plate shall be used to avoid explosion of glue. During outdoor winter construction, if the viscosity of the adhesive is too large, the adhesive shall be properly heated to reduce its viscosity and then mixed to ensure the uniformity of the adhesive; The adhered metal surface should also be preheated if conditions permit to facilitate the spreading and wetting of the adhesive on the surface. For single component glue, it can not be used immediately. It can be used only after the uneven components caused by sedimentation and stratification are eliminated by stirring or shaking. The unused glue shall be sealed for future use.


3. Pay attention to glue safety and environmental protection

Adhesives contain a variety of chemicals, most of which have certain toxic and side effects. For example, all kinds of organic solvents are flammable and explosive in addition to their different toxicity. We often see reports of poisoning accidents in the media. In addition, the curing agent, diluent, low molecular monomer and even some fillers in some adhesives are toxic. Therefore, there must be safety protection awareness and strict safety measures, such as: the construction site should have a good exhaust system to ensure that the concentration of toxic substances in the air will not reach the harm amount; If conditions permit, the dispensing shall be carried out in the fume hood; Operators shall wear protective eyes and gloves, gas masks and protective clothing when necessary; In addition, the construction site shall be equipped with fire hoses, dry powder fire extinguishers and foam fire extinguishers to prevent fire. Finally, the construction site shall be kept clean and orderly, and the spilled residual glue shall be cleaned in time.


4. Strengthen environmental protection awareness and minimize environmental pollution

It is mentioned above that attention should be paid to personal safety. However, it is not enough to discharge toxic odor from the construction site into the atmosphere. Although this protects the operator, it causes air pollution. Therefore, the fundamental measure is to control pollution from the source. Volatile organic compounds (VOCs) shall be sealed as far as possible to prevent them from escaping. For large-area construction plants, catalytic combustion devices can be considered to be installed. Indoor air is pumped into the catalytic combustion chamber by exhaust fans. Under the action of catalysts, trace organic compounds in the air are catalytically decomposed into non-toxic substances such as H2O, CO2 and N2, and then discharged. The waste liquid and rubber can not be poured into the sewer at will, and those that can be recycled should be recycled as much as possible. Those that cannot be recycled should be discharged after safe treatment (chemical treatment or physical treatment), or be burned in a high-temperature furnace and buried deep.


5. In case of personal injury accident, timely handle and rescue

For example, if the glue is stuck on the skin, it should be wiped off with acetone and other low toxic solvents in time, and cleaned with soapy water; For water-soluble toxicants (acid, alkali, etc.), first rinse with plenty of tap water to minimize the damage to the skin, and send them to medical treatment as needed. When the glue liquid enters the eyes, it should first be washed with a large amount of clean water, and the well should be sent to the hospital for treatment as soon as possible; In case of acute respiratory poisoning, the person shall be immediately carried to a ventilated place for artificial respiration, so that the toxic gas in the body can be discharged as soon as possible and sent to the hospital for treatment as soon as possible. In short, the principle of "safety first" is also applicable in the adhesive industry.


 

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