Wide-area efficient environment-friendly composite snow-melting deicing material and preparation method thereof
An environmentally friendly and efficient technology, applied in chemical instruments and methods, other chemical processes, climate change adaptation, etc., can solve problems such as large corrosion and damage to transportation infrastructure, damage to vegetation, and environmental pollution
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[0067] The preparation method of the cycloalkylimidazoline quaternary ammonium salt in the environmental protection additive includes the following steps:
[0068] (1) Molar ratio, naphthenic acid: diethylene triamine=1: (1.2~1.4), mix the two, and add H 3 BO 3 , Adding 0.3% to 0.5% of the naphthenic acid mass, stirring and heating to 120°C, refluxing for 5h, and then heating to 160°C for 2h to achieve intermolecular dehydration, until there is no moisture out, complete the amidation reaction;
[0069] Continue to heat up to 170°C for 3 hours, 200°C for 1.5 hours, and 220°C for 2.5 hours to achieve intramolecular dehydration, complete cyclization, and obtain an oil-soluble cycloalkylimidazoline intermediate;
[0070] (2) After cooling the cycloalkylimidazoline intermediate to 50℃, dissolve it in isopropanol of equal mass, add dimethyl sulfate dropwise to it, the dropping rate is 20 drops / min, mole ratio, imidazoline Intermediate: Dimethyl sulfate=1:(1.4~1.6), and keep the cooling tem...
Embodiment 1
[0119] The selection factor levels of the imidazoline quaternary ammonium salt, zinc dihydrogen phosphate and thiourea with different addition ratios of Examples 1-9 are shown in Table 5 below. Taking level 1, 100 mg / L of A (imidazoline quaternary ammonium salt) as an example, it points to adding 100 mg of imidazoline quaternary ammonium salt to the solution of the above-mentioned chloride salt concentration of 30 g / L for melting snow and ice materials. The corrosion inhibition rate data of the orthogonal experiment is shown in Table 6. Taking Example 1 as an example, the factor levels of imidazoline quaternary ammonium salt, zinc dihydrogen phosphate and thiourea are 100mg / L, 25mg / L and 100mg / L. That is, the mass ratio of the three added is 4:1:4, and the total added amount of 225 mg accounts for 0.75% of the chlorine salt 30g.
[0120] Table 5 Selection factor level of environmental additive formula
[0121]
[0122] Table 6 L 9 (3 4 ) Orthogonal experiment results
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Embodiment 2
[0133] (1) According to the mass ratio of 1:7:2, take NaCl and CaC1 respectively 2 ·2H 2 O and MgCl 2 ·6H 2 O, place the three in a mortar and grind them into powder, and stir them evenly into the chlorine salt main material LB-1 of the snow melting material;
[0134] (2) Prepare the following three groups of environmental additives in parallel:
[0135] According to the mass ratio: imidazoline quaternary ammonium salt: zinc dihydrogen phosphate: thiourea=4:2:8, the environmental protection additive b1 is prepared, and the environmental protection additive b1 accounts for 1.16% of the chlorine salt main material LB-1. Additive a1 is dissolved in water 3 times the mass of the environmental protection additive, and stirred and dissolved at room temperature to form a transparent environmental protection additive solution;
[0136] (3) Spray the solution obtained in (2) evenly on the surface of (1) with a small spray can, and mix well while spraying;
[0137] Put the mixture obtained in (...
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