Preparation method of polyvinyl alcohol based water-soluble nonwoven fabric
A technology of polyvinyl alcohol and non-woven fabrics, which is applied in the field of textile and chemical fibers. It can solve the problems of difficult development of direct cloth-forming technology, enhanced intermolecular interaction, and high melting point. It has broad market application prospects, high application value, and increased specific surface area. Effect
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Embodiment 1
[0026] Add 1 part of allyl polyethylene glycol (APEG) with a molecular weight of 1200 to a mixed solution of water and methanol with a mass ratio of 80:20, raise the temperature to 65°C, stir evenly and APEG dissolves into a homogeneous solution, then add Catalyst ammonium persulfate, at the same time, 20 parts of vinyl acetate (VAc) was added to the solution at a rate of 1 part / min, and reacted at 65°C for 3 hours to obtain polyvinyl acetate as the main chain and polyethylene glycol as the branched chain. Graft copolymer (PVAc-g-PEG). Carry out alcoholysis of PVAc-g-PEG with methanol, convert vinyl acetate group into hydroxyl group, obtain polyvinyl alcohol as the main chain, and polyethylene glycol as the branched graft copolymer PVA-g-PEG. Add 25 parts of PVA-g-PEG to 50 parts of methanol to make a solution, and start adding 25 parts of sodium hydroxide methanol solution (including 24 parts of methanol and 1.0 part of sodium hydroxide) dropwise to the solution to react for ...
Embodiment 2
[0028] Add 1 part of APEG with a molecular weight of 2400 to a mixed solution of water and methanol with a mass ratio of 80:20, raise the temperature to 70°C, stir evenly and APEG dissolves into a homogeneous solution, add a catalyst, and simultaneously add 30 parts of VAc with 1 Parts / min was added into the solution, and reacted at 70°C for 4.5 hours to obtain PVAc-g-PEG. Add 30 parts of PVA-g-PEG to 45 parts of methanol to make a solution, and start adding 25 parts of sodium hydroxide methanol solution (including 23 parts of methanol and 2.0 parts of sodium hydroxide) dropwise to the solution after the temperature is raised to 50 °C for 50 minutes. , after the reaction is finished, carry out suction filtration, washing and drying to obtain polyvinyl alcohol grafted polyethylene glycol copolymer II (PVA-g-PEG II).
Embodiment 3
[0030] Add 1 part of APEG with a molecular weight of 4000 to a mixed solution of water and methanol with a mass ratio of 80:20, raise the temperature to 80°C, stir evenly and APEG dissolves into a homogeneous solution, then add a catalyst, and at the same time, add 25 parts of VAc with 1 Parts / min was added to the solution, and reacted at 80°C for 6 hours to obtain PVAc-g-PEG. Add 25 parts of PVA-g-PEG to 50 parts of methanol to make a solution, and start adding 25 parts of sodium hydroxide methanol solution (including 24 parts of methanol and 1.0 part of sodium hydroxide) dropwise to the solution after the temperature rises to 45°C to react for 45 minutes , after the reaction is finished, carry out suction filtration, washing and drying to obtain polyvinyl alcohol grafted polyethylene glycol copolymer III (PVA-g-PEG III).
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