Vinyl alcohol polymer and its composition
A technology of vinyl alcohol polymer and vinyl alcohol, which is applied in the field of vinyl alcohol polymer and its composition, and can solve problems such as insufficient gas barrier properties
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Embodiment 1
[0103] Into a 250 L (liter) pressure reactor equipped with a stirrer, nitrogen inlet, ethylene inlet, initiator feed, and delay solution feed, 107.2 kg of vinyl acetate, 42.8 kg of methanol and 15.6 g of maleic anhydride were charged. The reactor was heated to 60° C., and the air in the reactor was replaced with nitrogen by bubbling nitrogen for 30 minutes. Then introduce ethylene to an internal pressure of 5.9kg / cm 2 . Separately, prepare a 2.8 g / L solution of 2,2′-azobis(4-methoxy-2,4-dimethylvaleronitrile) (AMV) in methanol and replace the interior with nitrogen by nitrogen bubbling air to obtain the initiator solution. Likewise, a 5% solution of maleic anhydride was prepared in methanol, and the internal air was replaced by nitrogen bubbling to prepare a delay solution. After adjusting the temperature inside the above-mentioned polymerization reactor to 60° C., 204 ml of the above-mentioned initiator solution was introduced to start polymerization. Continuous polymeriz...
Embodiment 2～8
[0108] A series of vinyl ester polymers were synthesized in the same manner as in Example 1 except that the conditions were changed as shown in Table 1 and Table 2. From these vinyl ester polymers, a series of PVAs were obtained in the same manner as in Example 1 except that the conditions were changed as shown in Table 3 and Table 4. Table 5 and Table 6 list the ethylene content of the resulting PVAs, the degree of polymerization, the degree of saponification, the total content of carboxyl and lactone rings, the amount of 1,2-diol bonds, based on vinyl alcohol units, located in three units The amount of the hydroxyl group of the vinyl alcohol unit in the center of three consecutive vinyl alcohol unit chains in the form of a group, and the amount of the alkali metal in the form of sodium based on 100 parts by weight of PVA. The water solubility, water resistance and low temperature viscosity stability of the obtained PVAs are given in Table 13 and Table 14. Comparative Exampl...
Embodiment 9 and comparative example 8
[0112] In embodiment 9, in the 250L pressure reactor that is equipped with stirrer, nitrogen inlet, ethylene inlet, initiator feeding inlet, add 76.6kg vinyl acetate, 73.3kg methyl alcohol and 217g allyl glycidyl ether, And in exactly the same manner as in Example 1, the air in the reactor was replaced with nitrogen. The steps of Example 1 were repeated, except that the conditions were changed as shown in Table 1, such as changes in the reaction pressure and the amount of AMV, or the comonomer allyl glycidyl ether was not continuously added, so that the polymerization was carried out and a series of Vinyl ester polymer with allyl glycidyl ether units. After 3 hours, when the conversion reached 20%, the reactor was cooled to terminate the polymerization. The reactor was opened to vent the ethylene, then nitrogen was bubbled through the reaction mixture to completely remove the ethylene. Unreacted vinyl acetate was then removed under reduced pressure to obtain a methanol solut...
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Abstract
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