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Preparation method of low-solubility sulfonated phenolic resin formed by pH response aggregate

A sulfonated phenolic resin, low-solubility technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of reduced hydrophilic properties of low-solubility phenolic resins, and difficulty in dissolving low-solubility phenolic resins. Stability, excellent high temperature resistance, good storage stability

Inactive Publication Date: 2021-12-17
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this will reduce the hydrophilicity of the low-solubility phenolic resin to be prepared, and then make the prepared low-solubility phenolic resin more difficult to dissolve in water

Method used

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  • Preparation method of low-solubility sulfonated phenolic resin formed by pH response aggregate
  • Preparation method of low-solubility sulfonated phenolic resin formed by pH response aggregate
  • Preparation method of low-solubility sulfonated phenolic resin formed by pH response aggregate

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Embodiment 1: Prepare raw materials: phenol, 37% formaldehyde solution, sodium hydroxymethanesulfonate, sodium hydroxide, deionized water.

[0019] First, the phenol is sealed and melted under the condition of 348.15K. After the phenol is completely melted, 47g of phenol is put into a 500ml four-necked bottle, and then 15g of sodium hydroxide solution (mass fraction 20%) and 4.042 g sodium hydroxymethanesulfonate. Equip the four-neck bottle with an electric stirrer, a reflux condenser, a thermometer and a constant pressure dropping funnel.

[0020] A stage of sulfomethylation and hydroxymethylation: Place the four-necked bottle in a water bath and heat it to keep the temperature of the reactants in the bottle at 368.15K-378.15K. Add 40.42 g of formaldehyde solution dropwise to the four-necked bottle, and the weight ratio of phenol, formaldehyde and sodium hydroxymethanesulfonate is 1:0.86:0.086. It should be noted that this process is an exothermic reaction, so it is ...

Embodiment 2

[0026] Prepare raw materials: phenol, 37% formaldehyde solution, sodium hydroxide, sodium hydroxymethanesulfonate, deionized water.

[0027] First phenol is carried out airtight melting under the condition of 348.15K, after treating that phenol melts completely, 47g phenol is dropped in the 500ml four-necked bottle, then adds 15g sodium hydroxide solution (mass fraction 20%) and 127.37 g sodium hydroxymethanesulfonate. Equip the four-neck bottle with an electric stirrer, a reflux condenser, a thermometer and a constant pressure dropping funnel.

[0028] A stage of sulfomethylation and hydroxymethylation: Place the four-necked bottle in a water bath and heat it to keep the temperature of the reactants in the bottle at 368.15K-378.15K. Add 48.88 g of formaldehyde dropwise to the four-necked bottle, and the weight ratio of phenol, formaldehyde and sodium hydroxymethanesulfonate is 1:1.04:2.71. It should be noted that this process is an exothermic reaction, so it is necessary to...

Embodiment 3

[0033] Prepare raw materials: phenol, 37% formaldehyde solution, sodium hydroxide, sodium hydroxymethanesulfonate, deionized water.

[0034] First phenol is carried out airtight melting under the condition of 348.15K, after treating that phenol melts completely, 47g phenol is dropped in the 500ml four-necked bottle, then adds 15g sodium hydroxide solution (mass fraction 20%) and 127.37 g sodium hydroxymethanesulfonate. Equip the four-neck bottle with an electric stirrer, a reflux condenser, a thermometer and a constant pressure dropping funnel.

[0035] A stage of sulfomethylation and hydroxymethylation: Place the four-necked bottle in a water bath and heat it to keep the temperature of the reactants in the bottle at 368.15K-378.15K. Add 40.42 g of formaldehyde dropwise to the four-necked bottle, and the weight ratio of phenol, formaldehyde and sodium hydroxymethanesulfonate is 1:0.86:2.71. It should be noted that this process is an exothermic reaction, so it is necessary to...

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Abstract

The invention discloses a preparation method of low-solubility sulfonated phenolic resin formed by pH response aggregate, and relates to the field of oil field recovery efficiency improvement. The phenolic resin is prepared by adopting a step-by-step alkali adding method and sulfonation treatment, so the polymerization degree of the prepared sulfomethylated phenolic resin is 1-8, the molecular weight is 400-1,400, the effective content of the resin is 25%, and the sulfomethylated phenolic resin can be placed at 338.15 K for more than 58 days. Phenolic resin has a unique pH response characteristic, and phenolic resin anions have coagulation-depolymerization capacity under alternate transformation of HCl and NaOH solution environments, so that the aggregate has unique plugging capacity, namely, the formed aggregate can plug pore throats and pore channels of rocks with different diameters through a particle size adjusting mechanism, and by controlling the pH value, the particle size of the aggregate is adjusted, so that the aggregate moves in the deep position of a rock stratum gap, and effective positions are blocked.

Description

technical field [0001] The invention relates to the technical field of modification and preparation of phenolic resins, in particular to a method for preparing low-solubility sulfonated phenolic resins formed from pH-responsive aggregates. Background technique [0002] In recent years, water-soluble phenolic resins have become an indispensable part of oil extraction, especially alkali-catalyzed phenolic resins are used in drilling fluids due to their excellent high temperature resistance and salt resistance. As a treatment agent, sulfonated phenolic resin has played an inestimable role in drilling fluids. The number of methylol groups on the prepared low-solubility phenolic resin molecules is reduced by adding alkali in stages, thereby improving the storage stability of the phenolic resin. However, this will reduce the hydrophilic property of the low-solubility phenolic resin to be prepared, and then make the prepared low-solubility phenolic resin more difficult to dissolve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/28C09K8/508C09K8/88
CPCC08G8/28C09K8/5086C09K8/885
Inventor 赵丹魏园园杨皓凌冯辉霞
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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