Preparation method and application of medium/low-temperature environment-friendly crosslinking agent
A cross-linking agent, an environmentally friendly technology, used in chemical instruments and methods, drilling compositions, organic chemistry, etc., can solve the problems of weak gel strength, serious volatility, and large dosage, and achieve strong gel forming ability. , good stability, less oil layer pollution
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[0026] The invention provides a method for preparing a medium-low temperature environment-friendly crosslinking agent, comprising:
[0027] Add the aldehyde solution in the reaction vessel, and adjust the pH value of the solution to within the range of 8-9;
[0028] Adding a stabilizer to the aldehyde solution, stirring evenly to obtain a mixed solution;
[0029] Adding melamine to the mixed solution to obtain a reaction system; wherein the weight ratios of the aldehyde solution, stabilizer and melamine are 20%-25%, 20%-25% and 50%-60% respectively;
[0030] The temperature of the reaction system is raised to 70°C-75°C, and the temperature is maintained at this temperature to fully react to obtain a reaction product, which is the medium-low temperature environment-friendly crosslinking agent.
[0031] It can be seen from the above that since the raw materials for the preparation of crosslinking agents in the present invention do not contain phenolic compounds, the use of mela...
Embodiment 1
[0055] Add 20 g of formaldehyde solution (concentration 37%) in the reaction vessel, and adjust the pH value of the solution to be about 8; add ethylene glycol 20 g to the formaldehyde solution, and stir to obtain a mixed solution; add melamine 60 g to the mixed solution , to obtain a reaction system; the reaction system was heated to 70° C., refluxed at this temperature for 6 hours, the reaction was stopped, and a light yellow liquid product was obtained after cooling, which was the medium-low temperature environmental protection crosslinking agent.
[0056] Configure a polyacrylamide aqueous solution with a mass fraction of 0.3%, adjust the pH of the solution to about 7, and age for 24 hours; then add the medium-low temperature environmental protection crosslinking agent prepared above, and the addition amount is 0.2% of the mass of the polyacrylamide aqueous solution. %, stirred for 10-15min until uniformly dispersed to obtain the base liquid; the base liquid was placed in a...
Embodiment 2
[0059] Add 25 g of formaldehyde solution (concentration 37%) in the reaction vessel, and adjust the pH value of the solution to be within the scope of about 9; add ethylene glycol 20 g to the formaldehyde solution, and stir to obtain a mixed solution; add 55 g of melamine was used to obtain a reaction system; the reaction system was heated to 75° C., refluxed at this temperature for 6 hours, and the reaction was stopped. After cooling, a slightly yellow liquid product was obtained, which was the medium-low temperature environmental protection crosslinking agent.
[0060] Configure a polyacrylamide aqueous solution with a mass fraction of 0.3%, and adjust the pH value of the solution to about 6.5 with 10% acetic acid in a mass concentration, and mature for 24 hours; 0.25% of the mass of polyacrylamide aqueous solution, stirred for 10-15 minutes until uniformly dispersed, to obtain base liquid; put the base liquid in a 40°C constant temperature box, and gel at constant temperatur...
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