Preparation of nanoscale vermiculite dispersion liquid and application of nanoscale vermiculite dispersion liquid in foam extinguishing agent

[0033] Vermiculite modification: Add 200g of deionized water into a three-necked flask, then add 50g of expanded vermiculite into the bottle, and add 36.5g of modifier dodecyltrimethylammonium bromide. The reaction was carried out at a constant temperature of 80° C. for 6 hours. The obtained intercalated modified vermiculite was repeatedly washed with deionized water to remove excess modifier, and AgNO 3 The filtrate was detected to be free of bromide ions. Dry and weigh to obtain 44g of modified vermiculite.

[0034] Vermiculite dispersion preparation: add the above-mentioned modified vermiculite of 5wt% (parts by weight) in a beaker, then gradually add 3wt% dispersant (modified acrylic anionic surfactant PL20, from Clariant), 2wt% Wetting agent (modified acrylate nonionic surfactant LCN407, from Clariant), and the rest added deionized water. It was pre-dispersed at 3000 rpm for 30 minutes under a high-speed stirrer, and the measured particle size was D50=39.5um. Transfer to

[0043] Vermiculite modification: Add 400g of deionized water into a three-necked flask, then add 100g of expanded vermiculite into the bottle, and add 103g of modifier cetyltrimethylammonium chloride. The reaction was carried out at a constant temperature of 80° C. for 6 hours. The obtained intercalated modified vermiculite was repeatedly washed with deionized water to remove excess modifier, and AgNO 3 Check the filtrate for the presence of chloride ions. Dry, weigh to obtain modified vermiculite dry product 102g.

[0044] Vermiculite dispersion preparation: add the above-mentioned modified vermiculite of 10wt% (parts by weight) in a beaker, then gradually add 5wt% dispersant (sodium lauryl sulfate, from Shanghai Sinopharm Group), 1wt% moistening agent Wetting agent (modified acrylate non-ionic surfactant LCN407, from Clariant), and the rest added deionized water. It was pre-dispersed at 2500 rpm for 60 minutes under a high-speed stirrer, and the measured particle size was D5

[0050] A kind of preparation of nanoscale vermiculite dispersion liquid, it is the following steps: (1) vermiculite modification, vermiculite obtains intercalation modified vermiculite through quaternary ammonium salt cation exchange modification; (2) modified vermiculite grinding , adding a dispersant and sanding in a sand mill to obtain a nano-vermiculite dispersion with an average particle size of 100 nanometers.

[0051] The vermiculite modification of the step (1), the vermiculite is obtained by intercalation modified vermiculite through quaternary ammonium salt cation exchange, and the reaction temperature is 60 ° C; the quaternary ammonium salt cation modifier is C12 alkyl trialkyl chloride ammonium chloride; after modification, the modified vermiculite is obtained by washing with water, filtering and drying.

[0052] The vermiculite is expandable vermiculite and expanded vermiculite, and its average particle size is 300 mesh.

[0053] The equipment used for grinding the