Preparation method of low-temperature-resistant anti-freezing agent for fruit trees
An antifreeze and low-temperature-resistant technology, applied in botany equipment and methods, biocides, pest control, etc., can solve problems such as short action time, poor cold resistance effect, and simple components of cold resistance agents, and achieve bond length Growth, structural stability, long-lasting effect of frost protection
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Embodiment 1
[0025] A preparation method of low-temperature resistant antifreeze for fruit trees, comprising:
[0026] (1)Fe 3 O 4 Magnetic fluid preparation: mix 3mol / L sodium hydroxide solution and 50g / L sodium dodecylbenzene sulfonate, pass N 2 Protect, heat up to 45℃, slowly add a mixed salt solution of ferric chloride and ferrous sulfate, Fe 3+ The concentration is 0.1mol / L, Fe 2+ The concentration is 0.1mol / L, and Fe 3+ With Fe 2+ The ratio of the substance is 1.5:1, the pH of the mixture solution is adjusted to 10, and the reaction is stirred at 40°C for 50min; the resulting product is washed with deionized water to neutrality, centrifuged down, vacuum dried at 50°C, and ground (particle size is 40 -100nm), save for future use;
[0027] (2) Fe immobilized by polysaccharides 3 O 4 Magnetic fluid preparation: Fe 3 O 4 The magnetic fluid is dispersed in a solution of chitosan and polyethylene glycol, and then dispersed by ultrasound; the concentrations of chitosan and polyethylene glycol are...
Embodiment 2
[0034] A preparation method of low-temperature resistant antifreeze for fruit trees, comprising:
[0035] (1)Fe 3 O 4 Magnetic fluid preparation: mix 3mol / L sodium hydroxide solution and 60g / L polyethylene glycol, pass N 2 Protect, heat up to 50℃, slowly add a mixed salt solution of ferric chloride and ferrous sulfate, Fe 3+ The concentration is 0.3mol / L, Fe 2+ The concentration is 0.3mol / L, and Fe 3+ With Fe 2+ The ratio of the substance is 1.5:1, the pH of the mixture solution is adjusted to 11, and the reaction is stirred at 60°C for 60min; the resulting product is washed with deionized water to neutrality, centrifuged down, vacuum dried at 50°C, and ground (particle size 40 -100nm), save for future use;
[0036] (2) Fe immobilized by polysaccharides 3 O 4 Magnetic fluid preparation: Fe 3 O 4 The magnetic fluid is dispersed in a solution of chitosan and polyethylene glycol, and then dispersed by ultrasound; the concentrations of chitosan and polyethylene glycol are respectively 3...
Embodiment 3
[0042] A preparation method of low-temperature resistant antifreeze for fruit trees, comprising:
[0043] (1)Fe 3 O 4 Magnetic fluid preparation: mix 3mol / L sodium hydroxide solution and 100g / L dodecyltrimethylammonium bromide, pass N 2 Protect, heat up to 60℃, slowly add a mixed salt solution of ferric chloride and ferrous sulfate, Fe 3+ The concentration is 0.3mol / L, Fe 2+ The concentration is 0.1mol / L, and Fe 3+ With Fe 2+ The ratio of the substance is 2.5:1, the pH of the mixture solution is adjusted to 12, and the reaction is stirred at 60°C for 70min; the resulting product is washed with deionized water to neutrality, centrifuged down, vacuum dried at 50°C, and ground (particle size is 40 -100nm), save for future use;
[0044] (2) Fe immobilized by polysaccharides 3 O 4 Magnetic fluid preparation: Fe 3 O 4 The magnetic fluid is dispersed in a solution of carboxymethyl cellulose and polyethylene glycol, and then dispersed ultrasonically; the concentrations of chitosan and polye...
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