Paper-plastic composite airbag for pipeline welding argon filling plugging and preparation method of airbag
A technology of paper-plastic composite and air bag, which is applied in the direction of welding equipment, welding medium, pipe/pipe joint/pipe fitting, etc., to achieve the effect of improving welding quality, high gas barrier property and low cost
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[0021] Example 1:
[0022] A paper-plastic composite airbag for pipeline welding and argon-filled sealing is prepared from polyvinyl alcohol, organic defoaming agent, glycerol, flame retardant, water and other components. The preparation method includes the following steps:
[0023] (1) Under normal temperature and pressure, dissolve 158.4 g of polyvinyl alcohol in 1,320 ml of water containing 15 g of glycerol, stir at 1000 rpm for 10 minutes and add 7.5 g of silicone defoamer dropwise to dissolve and keep it warm for 2~ 2.5 hours. Then add 180g of flame retardant and 0.1g of isothiazolinone anti-mold bactericide to the solution, and fully stir for 20 minutes until completely dissolved and evenly dispersed. Stop stirring and let stand for 2h.
[0024] (2) Cut the paper into a 10-inch circle according to the pipe size. Coat its surface uniformly with a layer of the solution prepared in step (1), and heat it at 95°C to completely dry it.
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[0025] Example 2:
[0026] A paper-plastic composite airbag for pipeline welding and argon-filled sealing is prepared from polyvinyl alcohol, organic silicon defoamer, triethanolamine, flame retardant, water and other components. The preparation method includes the following steps:
[0027] (1) Under normal temperature and pressure, dissolve 162g of polyvinyl alcohol in 1350ml of water containing 15g of glycerol, stir at 1000rpm for 10min and add dropwise 7.5g of silicone defoamer to dissolve and keep it warm for 2~2.5 hours . Then add 7.5 g of triethanolamine and 150 g of flame retardant to the solution, and fully stir for 20 minutes until it is completely dissolved and dispersed evenly. Stop stirring and let stand for 2h.
[0028] (2) Cut the paper into a 12-inch circle according to the pipe size. Coat the surface uniformly with a layer of the solution prepared in step (1), and heat it at 95°C to completely dry it.
[0029] (3) Repeat step (2) to prepare 3-layer and 4-layer pape...
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