Inorganic silicon-maleic anhydride grafted polyvinyl alcohol material and its preparation method and application
A technology of maleic anhydride and polyvinyl alcohol, used in coatings, adhesive additives, polymer adhesive additives, etc., can solve problems such as poor water resistance, and achieve improved sensitivity, small viscosity changes, and good water resistance. sexual effect
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Embodiment 1
[0034](1) Preparation of MAH grafted PVA
[0035] Take 2.2g of polyvinyl alcohol (PVA) and add it into a reactor filled with 55g of DMSO, fully stir and dissolve in an 80°C constant temperature water bath, and cool to 60°C after the dissolution is complete, and keep the temperature constant for later use. Dissolve 4.9g of maleic anhydride (MAH) in 11g of DMSO to make a solution, and slowly add it dropwise to the reactor, and continue the constant temperature reaction for 4h after the dropwise addition is completed. After the reaction, the reaction mixture was purified and washed with a mixed solution of ethyl acetate and absolute ethanol (volume ratio 1:0.3), filtered, and the filter cake was naturally dried to obtain a white solid, which was MAH grafted PVA (2.89g). The obtained MAH grafted PVA is calculated grafting rate according to the following formula:
[0036]
[0037] M=gained MAH grafted PVA quality; m=PVA quality;
[0038] The grafting ratio of the MAH grafted P...
Embodiment 2
[0047] (1) Preparation of MAH grafted PVA
[0048] The formula is as follows:
[0049]
[0050] Other operating conditions were the same as step (1) of Example 1 to obtain MAH grafted PVA (1.38g). Calculated according to the formula of Example 1, the grafting ratio of MAH-grafted PVA in this embodiment is 20.29%.
[0051] (2) The material ratio and operating conditions were the same as step (2) of Example 1, and an inorganic silicon-maleic anhydride grafted polyvinyl alcohol material solution (17.08 g) was prepared.
[0052] (3) Prepare the film of the material according to the method of step (3) of Example 1.
Embodiment 3
[0054] (1) Preparation of MAH grafted PVA
[0055] The formula is as follows:
[0056]
[0057] Other operating conditions were the same as step (1) of Example 1 to obtain MAH grafted PVA (6.1 g). The obtained MAH grafted PVA was calculated according to the formula of Example 1, and the grafting rate was 27.87%.
[0058] (2) The material ratio and operating conditions were the same as step (2) of Example 1, and an inorganic silicon-maleic anhydride grafted polyvinyl alcohol material solution (16.86 g) was prepared.
[0059] (3) Prepare the film of the material according to the method of step (3) of Example 1.
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