Preparation of ultra-thin modified hydrotalcite and its application in rubber gas barrier film materials
A film material, modified water technology, applied in the directions of hydrotalcite, aluminum compounds, coatings, etc., can solve the weak interaction between hydrophilic clay and non-hydrophilic polymer, the limitation of gas barrier performance, and the reduction of material mechanical properties and other problems, to achieve the effect of improving interface compatibility, excellent gas barrier properties, and reducing free volume
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Embodiment 1
[0029] A. Weigh 0.512g Mg(NO 3 ) 2 ·6H 2 O and 0.375g Al(NO 3 ) 3 9H 2 O was dissolved in 100 mL of deionized water to make a mixed salt solution, 1 g of NaOH was weighed and dissolved in 100 mL of deionized water to make a NaOH solution, and NaNO containing 25 vol% formamide was prepared 3 The solution is 100mL, the concentration of sodium nitrate is 0.01mol / L; under the condition of mechanical stirring at 80°C, add the prepared mixed salt solution and NaOH solution dropwise to the prepared formamide NaNO 3 React in the solution, use NaOH solution to control the pH value of the reaction at about 10, complete the dropwise addition within 10 minutes, then centrifuge and wash twice, add water and centrifuge, take the supernatant to obtain an ultra-thin hydrotalcite colloid solution, of which hydrotalcite The content is 0.05wt%. see figure 1 and 2 , show the XRD patterns and TEM patterns of the ultrathin hydrotalcite samples, respectively.
[0030] B. Add polyvinylpyrrol...
Embodiment 2
[0036] A. Weigh 1.024g Mg(NO 3 ) 2 ·6H 2 O and 0.375g Al(NO 3 ) 3 9H 2 O was dissolved in 100 mL of deionized water to make a mixed salt solution, 1 g of NaOH was weighed and dissolved in 100 mL of deionized water to make a NaOH solution, and NaNO containing 35 vol% formamide was prepared 3 Solution 100mL, sodium nitrate concentration 0.02mol / L; under the condition of mechanical stirring at 90°C, add the prepared mixed salt solution and NaOH solution dropwise to the prepared NaNO 3 In the solution, use NaOH solution to control the pH value of the reaction at about 11, and complete the dropwise addition within 20 minutes; then centrifuge and wash 3 times, add water and centrifuge, and take the supernatant to obtain an ultra-thin hydrotalcite colloid solution, wherein the hydrotalcite content is 0.07 wt%.
[0037] B. Sodium dodecylsulfonate (1wt%) was added to the ultrathin hydrotalcite nanosheet solution obtained in step A, and magnetically stirred for 3 hours to obtain a...
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