A kind of preparation method of melamine resin tanning agent
A technology of melamine and tanning agent, which is applied in the field of preparation of melamine resin tanning agent, can solve the problems of inapplicable application requirements, high content of free formaldehyde in leather, etc., and achieve the effect of promoting reaction and improving reaction efficiency
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Embodiment 1
[0020] A kind of preparation method of melamine resin tanning agent, concrete steps are as follows:
[0021] (1) Prepare sodium bisulfite solution: add 230kg of water into the dissolution kettle, start stirring, add 133kg of pyrosulfite from the manhole, and stir until completely dissolved;
[0022] (2) Prepare urea solution: add 65kg of water to another dissolution kettle, start stirring, raise the temperature to 50°C, add 80kg of urea from the manhole, and stir until completely dissolved;
[0023] (3) Condensation reaction: transfer the above prepared sodium bisulfite solution into the condensation kettle, start stirring, add 234kg of formaldehyde into the condensation kettle, after adding the formaldehyde, add 225kg of dispersant and 42.5kg of melamine from the manhole , raise the temperature in the condensation kettle to 90°C, the jacket temperature does not exceed 100°C when the condensation kettle is heated, and keep the temperature at 90°C for 2 hours. Adjust the inter...
Embodiment 2
[0026] A kind of preparation method of melamine resin tanning agent, concrete steps are as follows:
[0027] (1) Prepare sodium bisulfite solution: add 225kg of water into the dissolution kettle, start stirring, add 130kg of pyrosulfite from the manhole, and stir until completely dissolved;
[0028] (2) Prepare urea solution: add 60kg of water to another dissolution kettle, start stirring, raise the temperature to 50°C, add 75kg of urea from the manhole, and stir until completely dissolved;
[0029] (3) Condensation reaction: transfer the above prepared sodium bisulfite solution into the condensation kettle, start stirring, add 229kg of formaldehyde into the condensation kettle, after adding the formaldehyde, add 200kg of dispersant and 41.6kg of melamine from the manhole , raise the temperature in the condensation kettle to 90°C, the jacket temperature does not exceed 100°C when the condensation kettle is heated, and keep the temperature at 90°C for 2 hours. Adjust the inter...
Embodiment 3
[0032] A kind of preparation method of melamine resin tanning agent, concrete steps are as follows:
[0033] (1) Prepare sodium bisulfite solution: add 235kg of water into the dissolution kettle, start stirring, add 136kg of pyrosulfite from the manhole, and stir until completely dissolved;
[0034] (2) Prepare urea solution: add 70kg of water to another dissolution kettle, start stirring, raise the temperature to 50°C, add 85kg of urea from the manhole, and stir until completely dissolved;
[0035] (3) Condensation reaction: transfer the above prepared sodium bisulfite solution into the condensation kettle, start stirring, add 239kg of formaldehyde into the condensation kettle, after adding the formaldehyde, add 250kg of dispersant and 43.4kg of melamine from the manhole , raise the temperature in the condensation kettle to 90°C, the jacket temperature does not exceed 100°C when the condensation kettle is heated, and keep the temperature at 90°C for 2 hours. Adjust the inter...
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