Modifying method and application of epoxy grease

[0084] Example 1

[0085] A modification method of epoxy grease includes the following steps:

[0086] 1) Preparation of epoxy waste oil: Take 300 mL of waste oil (acid value 70mgKOH / g, mass percentage of water less than 5%), add 3.6g cetyltrimethylammonium bromide (phase transfer catalyst), 2.4 g phosphotungstic acid, then add 150 mL of 30% hydrogen peroxide aqueous solution, add dropwise to react for 2h in the 60℃ system, then wash the product with deionized water 3 times, centrifuge the washed product at 4000r / min for 6min and take the upper layer , Get epoxy waste oil, the measured epoxy value is 4.55%;

[0087] 2) Preparation of phosphoric acid modified epoxy waste oil: Take 200g of epoxy waste oil in a beaker, add a phosphoric acid aqueous solution with a mass fraction of phosphoric acid of 85%, and the mass of phosphoric acid aqueous solution is 6‰ of the mass of epoxy waste oil at 20°C After reacting for 24 hours, the modified epoxy waste oil is obtained, the epoxy value i

[0089] Examples 2-7

[0090] The preparation methods of Examples 2-7 are the same as those of Example 1, except that the masses of the phosphoric acid aqueous solution added in Examples 2-7 are 0‰, 1‰, 2‰, 3‰, and 4 of the epoxy waste oil. ‰, 5‰, namely 0, 0.2, 0.4, 0.6, 0.8, 1.0g.

[0091] by figure 2 It can be seen that when the mass of phosphoric acid increases from 0 to 1.2g, the epoxy value of modified epoxy waste oil continues to decrease, from 4.55% to 2.23%, and the hydroxyl value of modified epoxy waste oil continues to increase. The increase from 188.53mg / g to 227mg / g shows that phosphoric acid, as a medium-strong acid, can promote the ring-opening reaction of the three-membered ring with lower tension in the epoxy waste oil to generate polyhydroxy compounds.

[0092] Example 8

[0093] A modification method of epoxy grease includes the following steps:

[0094] 1) Preparation of epoxy waste oil: Take 300 mL of waste oil (acid value 80mgKOH / g, mass percentage of water less than 3%), add 3.6g cetyltrimethylammonium bromide (phase transfer catalyst), 2.4 g phosphotungstic acid, then add 150 mL of 30% hydrogen peroxide aqueous solution, add dropwise to react for 2h in a 50℃ system, then wash the product with deionized water 3 times, centrifuge the washed product at 4000r / min for 6min and take the upper layer , Get epoxy waste oil, the measured epoxy value is 4.1%;

[0095] 2) Phosphoric acid modified epoxy waste oil: Take 200g of epoxy waste oil in a beaker, add a phosphoric acid aqueous solution with a mass fraction of phosphoric acid of 85%, the mass of phosphoric acid aqueous solution is 2‰ of the mass of epoxy waste oil, and react at 25°C After 24 hours, the modified epoxy waste oil was obtained, the epoxy value was 3.5%, and the epoxy