N-methylol acrylamide and preparation thereof
A technology of methylolacrylamide and acrylamide, applied in the field of N-methylolacrylamide and its preparation, can solve the problems of dangerous solvents, poor environmental protection performance, strong toxicity, etc., and achieve high product quality and good environmental protection performance , less toxic effect
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Embodiment 1
[0032] A kind of N-methylolacrylamide, its composition and weight (kg) are:
[0033] Acrylamide 60
[0034] Paraformaldehyde 20
[0035] water 15
[0037] The steps of a preparation method of N-methylolacrylamide are:
[0038] (1). Fully stir and mix acrylamide, paraformaldehyde, water, p-hydroxyanisole, and sodium methoxide in the reaction kettle according to the proportion to form a mixed solution, and the addition amount of polymerization inhibitor p-hydroxyanisole is 100-500ppm ; Then open the steam valve to control the heating rate;
[0039] (2). The catalyst sodium methoxide is added at a vapor pressure of 0.5-1Mpa and a temperature of 40°C;
[0040] (3). When the temperature rises to 60°C, keep it for 1.5 hours, the reaction ends, cooling and crystallization produces crystals;
[0041] (4). The crystals are dehydrated by a dehydrator and dried to obtain the finished product.
Embodiment 2
[0043] Acrylamide 50
[0044] Paraformaldehyde 15
[0045] water 25
[0047] The polymerization inhibitor in the reaction system is phenothiazine, and the addition amount is 50-300ppm.
[0048] The steps of its preparation method are the same as in Example 1.
Embodiment 3
[0050] Acrylamide 45
[0051] Paraformaldehyde 25
[0052] water 20
[0053] sodium hydroxide 6.
[0054] The polymerization inhibitor in the reaction system is selected from hydroquinone, and the addition amount is 0-200ppm.
[0055] The steps of its preparation method are the same as in Example 1.
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