A kind of urea phenolic resin crosslinking agent and its synthetic method
A technology of phenolic resin cross-linking and synthesis method, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of long storage time, loss of cross-linking performance, multi-active groups, etc., to improve stability, Effect of preventing curing
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Embodiment 1
[0020] This embodiment provides a urea-phenolic resin crosslinking agent, which is obtained by adding urea after the reaction of formaldehyde and phenol under the action of an alkali catalyst, wherein the molar ratio of formaldehyde to phenol is 3-4:1, and the ratio of phenol to formaldehyde The molar ratio of the total number of moles to urea is 4-5:1, and the amount of the catalyst accounts for 0.2-0.5% of the sum of the mass of formaldehyde, phenol and urea.
[0021] The present invention modifies the phenolic resin with urea to synthesize the urea-phenolic resin cross-linking agent. On the one hand, it reduces the number of active groups in the phenolic resin cross-linking agent, prevents the curing of the urea-phenolic resin, and improves the stability of the urea-phenolic resin. On the one hand, urea is used to modify the phenolic resin to make excess urea, consume excess formaldehyde, and not release formaldehyde during storage, transportation, and use, meeting the requi...
Embodiment 2
[0023] On the basis of embodiment 1, this embodiment provides a kind of synthetic method of urea phenolic resin crosslinking agent, comprises the following steps:
[0024] Step 1) Pour the formula amount of phenol into the reactor first, divide the alkali catalyst into two parts, and the mass ratio of the two parts is 2:1, then dissolve a larger part of the alkali catalyst in water and add it to the reactor, and then react Put the device into a constant temperature water bath at 70-90°C, stir and react for 15-25min;
[0025] Step 2) Divide the formula amount of formaldehyde into two parts with a mass ratio of 4:1, add a larger part of formaldehyde to the reactor, and continue to stir and react for 35-40 minutes in a constant temperature water bath at 70-90°C;
[0026] Step 3) Dissolve another base catalyst in water and add it to the reactor, and stir and react in a constant temperature water bath at 70-90°C for 15-25min;
[0027] Step 4) Add another portion of formaldehyde in...
Embodiment 3
[0055] On the basis of Example 2, this example provides a synthesis method of a urea-phenol-formaldehyde resin crosslinking agent. The specific method: weigh phenol according to formaldehyde:phenol=3:1 (molar ratio), and pour it into a three-necked flask; Weigh sodium hydroxide according to the proportion of 0.3%, and divide it into two parts of 0.2% and 0.1%. Stir the reaction for 20 minutes to catalyze the first step of phenol alkalinity; then add formaldehyde accounting for 80% of the total weight of formaldehyde, and continue to stir and react at a constant temperature of 70°C for 40 minutes; then dissolve the remaining 0.1% sodium hydroxide in water and pour it into In the three-neck flask, keep stirring at a constant temperature of 70°C for 20 minutes; finally add the remaining 20% formaldehyde, raise the temperature to 90°C, and stir for 20 minutes; add urea according to (phenol + formaldehyde): urea is 4.2:1 (molar ratio) , keep the temperature at 90°C, stir and reac...
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Abstract
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