Views: 285 Author: Vickey Publish Time: 2023-06-06 Origin: Site
PVA is a synthetic resin that is colorless and water-soluble and is mostly used to treat paper and textiles.
PVA is distinct from other polymers in that it is not created by the polymerization of monomeric precursor molecules, which are small, single-unit molecules. Polymers are chemical compounds made up of big, multi-unit molecules. Instead, polyvinyl acetate (PVAc), another polymer, is dissolved in an alcohol like methanol and treated with an alkaline catalyst like sodium hydroxide to produce PVA. The PVAc molecules' acetate groups are eliminated during the next hydrolysis, also known as "alcoholysis," without the long-chain structure being altered.
The final product of the reaction is extremely soluble in water and essentially insoluble in almost all organic solvents.Incomplete removal of the acetate groups yields resins less soluble in water and more soluble in certain organic liquids.
PVA is a sizing agent that strengthens textile fibers and increases the oil and grease resistance of paper. It is also used as a starting material for the creation of other resins, as a water-soluble protective film, and as an ingredient in adhesives and emulsifiers. The resins polyvinyl butyral (PVB) and polyvinyl formal (PVF) may be created from PVA by reacting it with butyraldehyde (CH3CH2CH2CHO) and formaldehyde (CH2O). Laminated safety glass is frequently made with PVB, a robust, transparent, water-resistant, adhesive plastic sheet, particularly for vehicles. In wire insulation, PVF is utilized.
Skin contact: take off the contaminated clothing and rinse with running water.
Eye contact: Lift the eyelids and rinse with running water or normal saline. seek medical advice.
Inhalation: tow away from the site to the fresh air place. If breathing is difficult, give oxygen. seek medical advice.
Eat:drink enough warm water, and vomit. seek medical advice.
Quarantine the leakage pollution area and restrict access. Cut off the fire source. It is recommended that emergency handling personnel wear dust masks (full cover) and gas suits. Avoid dust; carefully sweep it up; put it in a bag; and transfer it to a safe place. It can also be washed with a lot of water, diluted, and put into the wastewater system. If there is a lot of leakage, cover with plastic cloth or canvas. Collect and recycle it, or transport it to the waste disposal site for disposal.
Respiratory system protection: when the dust concentration in the air exceeds the standard, a self-suction filter dust mask must be worn. An air respirator should be worn for emergency rescue or evacuation.
Eye protection: Wear chemical safety glasses. Body protection: wear anti-virus penetration work clothes.
Hand protection: wear rubber gloves.
Other protection: Smoking is strictly prohibited at the work site. Maintain good hygiene habits.
Operation precautions: Provide good natural ventilation conditions. Operators must be specially trained and strictly follow the operating procedures. It is recommended that operators wear self-priming filter dust masks, chemical safety protection glasses, poison-proof penetration work clothes, and rubber gloves. Stay away from fire and heat sources, and smoking is strictly prohibited in the workplace. Use an explosion-proof ventilation system and equipment. Avoid dust production. Avoid contact with the oxidant. When handling, use light loading and unloading to prevent damage to packaging and containers. Equipped with the corresponding variety and quantity of firefighting equipment and leakage emergency treatment equipment. The empty container may contain harmful substances.
Storage precautions: store in a cool, ventilated warehouse. Stay away from the fire and heat sources. Should be stored separately from the oxidant; avoid mixed storage. Equipped with the corresponding variety and quantity of firefighting equipment. The storage area shall be equipped with suitable material for leakage.