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Things you need to pay attention to when using polyvinyl alcohol

Things you need to pay attention to when using polyvinyl alcohol

Polyvinyl alcohol (PVA), a colorless water-soluble synthetic resin, is mainly used to treat textiles and paper. This very practical chemical raw material also has a certain degree of danger. So there are many precautions for use.

This passage is going to talk about the followings of Polyvinyl alcohol attentions:

(1) Chemical properties of polyvinyl alcohol

(2) The dangers of polyvinyl alcohol

(3) Precautions for handling polyvinyl alcohol products

 

(1) Chemical properties of polyvinyl alcohol

Polyvinyl alcohol is a unique polymer (chemical compounds made from large, multi-unit molecules) because it is not a molecule called a monomer in which the polymerization is built from the reaction precursor of a single unit. Instead, polyvinyl alcohol is made by dissolving another polymer (polyvinyl acetate (PVAc)) in alcohol (such as methanol) and treating it with a basic catalyst (such as sodium hydroxide). The resulting hydrolysis or "alcolysis" reaction can remove the acetate group from the PVAc molecule without destroying its long-chain structure.

Polyvinyl alcohol is used as a sizing agent to give textile yarns greater strength and make paper more resistant to oil and grease. It is also used as a component of adhesives and emulsifiers, as a water-soluble protective film, and as a raw material for preparing other resins.

 

(2) The dangers of polyvinyl alcohol

Inhalation and ingestion of polyvinyl alcohol are harmful to the body and have a stimulating effect on the eyes. And polyvinyl alcohol is flammable and irritating, so there are many precautions for its use.

Hazardous characteristics: Polyvinyl alcohol powder and air can form an explosive mixture. When it reaches a certain concentration, it will explode when it encounters sparks. Thermal decomposition produces flammable gas.

Polyvinyl alcohol can produce harmful combustion products: carbon monoxide and carbon dioxide.

The firefighting method of polyvinyl alcohol: firefighters must wear gas masks and full-body firefighting clothes, and put out the fire in the upwind direction. Extinguishing agent: water mist, foam, dry powder, carbon dioxide, sandy soil.

If it leaks, it must be dealt with immediately: Isolate the leaked contaminated area and restrict access. Cut off the fire source. It is recommended that emergency response personnel wear dust masks (full face masks) and gas-proof clothing. Avoid dust, sweep up carefully, put in polyvinyl alcohol in a bag and transfer to a safe place. It can also be washed with a lot of water, and the washing water is diluted and put into the waste water system. If there is a large amount of polyvinyl alcohol leakage, cover it with plastic sheeting or canvas. Collect and recycle or transport to waste disposal sites for disposal.

 

(3) Precautions for handling polyvinyl alcohol products

Precautions for the operation of polyvinyl alcohol: Operate under good natural ventilation conditions. Operators must undergo special training and strictly abide by the operating procedures. It is recommended that operators wear self-priming filter dust respirators, chemical safety glasses, protective clothing and rubber gloves.

Keep away from fire and heat sources when handling polyvinyl alcohol, and smoking is strictly prohibited in the workplace. Use explosion-proof ventilation systems and equipment. Avoid generating dust. Avoid contact of polyvinyl alcohol with oxidants. When handling, load and unload with care to prevent damage to packaging and containers. Equipped with corresponding types and quantities of fire-fighting equipment and leakage emergency treatment equipment. Empty containers may be harmful residues.

Precautions for storing polyvinyl alcohol: Store in a cool, ventilated warehouse. Keep away polyvinyl alcohol from fire and heat sources. Polyvinyl alcohol should be stored separately from the oxidant, and should not be mixed. Equipped with the appropriate variety and quantity of fire equipment. The polyvinyl alcohol storage area should be equipped with suitable materials to contain the leakage.

 

 

 


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