A preparation method of polyurea wear-resistant coating based on organic-inorganic double modification treatment
A technology of wear-resistant coatings and amino modification, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as shortening service life, reducing work efficiency of heavy-duty transport dump trucks, easy wear and corrosion of carriages, and achieves wear-resistant effects Improved effect
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Embodiment 1
[0026] The first step, the preparation of amino-modified silica: by weight, after mixing 35 parts of ethyl orthosilicate, 16 parts of 30wt% concentrated ammonia water, 12 parts of deionized water and 200 parts of ethanol, Carry out the hydrolysis reaction, the temperature of the hydrolysis reaction is 35°C, and the reaction time is 3h. After the reaction is completed, the silica particles are separated by centrifugation, washed with water, and evaporated to dryness under reduced pressure; the obtained silica is dispersed in 200 parts of ethanol Add 20 parts of γ-aminopropyltriethoxysilane, stir to carry out the modification reaction, the modification reaction temperature is 15°C, the modification reaction time is 3h, then centrifuge the solid, and then use ethanol 1. After washing with water, amino-modified silica is obtained;
[0027] The 2nd step, the preparation of the modifying agent of aldylation: in parts by weight, dissolve 15 parts of components shown in formula (I) in...
Embodiment 2
[0032] The 1st step, the preparation of the silicon dioxide of amino-modification: by weight, after mixing 40 parts of ethyl orthosilicate, 28 parts of 35wt% concentrated ammonia water, 18 parts of deionized water, and 350 parts of ethanol, Carry out hydrolysis reaction, the temperature of hydrolysis reaction is 40 ℃, the reaction time is 3 ~ , after the reaction is over, centrifuge to separate the silica particles, after washing with water, evaporate to dryness under reduced pressure; the silica obtained is dispersed in 250 parts of Add 35 parts of γ-aminopropyltriethoxysilane to ethanol, stir for modification reaction, the modification reaction temperature is 25°C, the modification reaction time is 5h, then centrifuge the solid matter, and then use After washing with ethanol and water, amino-modified silicon dioxide is obtained;
[0033] The 2nd step, the preparation of the modifying agent of aldylation: in parts by weight, dissolve 30 parts of components shown in formula (I...
Embodiment 3
[0038]The 1st step, the preparation of the silicon dioxide of amino-modification: by weight, after mixing 38 parts of ethyl orthosilicate, 22 parts of 32wt% concentrated ammonia water, 16 parts of deionized water, and 320 parts of ethanol, Carry out the hydrolysis reaction, the temperature of the hydrolysis reaction is 36°C, and the reaction time is 6h. After the reaction is completed, the silica particles are separated by centrifugation, washed with water, and evaporated to dryness under reduced pressure; the obtained silica is dispersed in 220 parts of ethanol Add 27 parts of γ-aminopropyltriethoxysilane, stir to carry out the modification reaction, the modification reaction temperature is 18°C, the modification reaction time is 4h, then centrifuge the solid, and then use ethanol 1. After washing with water, amino-modified silica is obtained;
[0039] The 2nd step, the preparation of the modifying agent of aldylation: in parts by weight, dissolve 20 parts of components shown...
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