Synthesis and application of water-soluble lignosulfonate grafted urea resin sand solidification agent
A technology of lignosulfonate and urea-formaldehyde resin, which can be used in application, fertilizer mixture, soil conditioning materials, etc., can solve the problems of limited use, low strength of dense layer, etc., and achieve short reaction period, good reproducibility, and high yield high effect
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Embodiment 1
[0028] Add 35ml of formaldehyde solution with a mass fraction of 37%, 5g of melamine and 17g of urea into the three-neck flask, adjust the pH value of the system to 9.0 with sodium hydroxide solution, and heat up to 70°C for methylolation reaction. After 10 min, a second batch of 5 g of urea was added to continue the reaction. The temperature was raised to 90°C, the pH was adjusted to 11, and 10 g of sodium bisulfite was added to carry out the sulfonation reaction. After reacting for 90 minutes, lower the temperature to 80°C, and adjust the pH to 4.5 for polycondensation until the viscosity reaches the required requirement, then adjust the pH value back to 7, then add 5g of lignin and 2.4g of urea to react for 60 minutes, and then discharge the product after natural cooling to obtain Brown lotion.
[0029] The experimentally synthesized emulsion has good stability. At 35°C, the viscosity of the emulsion is 3.0421mPa·s when the solid content of the emulsion is diluted to 5%. ...
Embodiment 2
[0032] Add 42ml of formaldehyde solution with a mass fraction of 37%, 5g of melamine and 17g of urea into the three-necked flask, adjust the pH value of the system to 9.0 with sodium hydroxide solution, and heat up to 70°C for methylolation reaction. After 10 min, a second batch of 5 g of urea was added to continue the reaction. The temperature was raised to 90°C, the pH was adjusted to 11, and 10 g of sodium bisulfite was added to carry out the sulfonation reaction. After reacting for 90 minutes, lower the temperature to 80°C, and adjust the pH to 4.5 for polycondensation until the viscosity reaches the required requirement, then adjust the pH value back to 8, then add 5g of lignin and 2.4g of urea to react for 60min, and then discharge the product after natural cooling to obtain Brown lotion.
[0033] The experimentally synthesized emulsion has good stability. At 35°C, the viscosity of the emulsion is 3.3248mPa·s when the solid content of the emulsion is diluted to 5%. The...
Embodiment 3
[0035] Add 50ml of formaldehyde solution with a mass fraction of 37%, 5g of melamine and 17g of urea into the three-neck flask, adjust the pH value of the system to 9.0 with sodium hydroxide solution, and heat up to 70°C to carry out methylolation reaction. After 10 min, a second batch of 5 g of urea was added to continue the reaction. The temperature was raised to 90°C, the pH was adjusted to 11, and 10 g of sodium bisulfite was added to carry out the sulfonation reaction. After reacting for 90 minutes, lower the temperature to 80°C, and adjust the pH to 4.5 for polycondensation until the viscosity reaches the required requirement, then adjust the pH value back to 7, then add 5g of lignin and 2.4g of urea to react for 60 minutes, and then discharge the product after natural cooling to obtain Brown lotion.
[0036] The experimentally synthesized emulsion has good stability. At 35°C, the viscosity of the emulsion is 3.7158mPa·s when the solid content of the emulsion is diluted...
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