Preparation method of water-dispersed phenolic resin
A phenolic resin and dispersion technology, which is applied in the preparation of phenolic resin and the preparation of water-dispersed phenolic resin
Inactive Publication Date: 2011-05-25
CHINA UNIV OF PETROLEUM (BEIJING)
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AI Technical Summary
Problems solved by technology
[0004] For a long time, in the field of materials, the research of phenolic resin has been a hot spot, but the research of water-dispersed phenolic resin has not been reported, because both thermosetting phenolic resin and thermoplastic phenolic resin are insoluble in water.
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment
[0025] Mix 87.20g of phenol, 64.00g of formaldehyde solution (concentration of 37wt%) and 1.5g of HCl solution (concentration of 3.7wt%), mix and stir uniformly to obtain a mixture, heat to 100°C, continue heating to keep it slightly boiling for 1 hour;
[0026] Cool down to 90°C, add 41.72g NaOH solution (concentration 40wt%), after the addition, increase the temperature to 100°C, keep it for 10 minutes, add 27g deionized water, cool to room temperature, discharge, get a water-dispersed phenolic resin, the product is effective The content is 50wt%. The dilute deionized water solution of the product was turbid. In a 100 mg / kg water dispersion system, the molecular aggregates of the water-dispersed phenolic resin prepared in this example had an average hydrodynamic diameter of about 50 nm.
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Abstract
The invention relates to a preparation method of water-dispersed phenolic resin. The preparation method comprises the following steps: mixing phenol and formaldehyde solution evenly, then adding acid to obtain a mixture, heating the mixture to a gentle boiling state to maintain for 1-3h; and reducing the temperature to 70-90 DEG C, adding strong alkaline solution to neutralize, and then reducing the temperature to the room temperature to obtain water-dispersed phenolic resin. The phenolic resin prepared by the synthesis method of the invention has a certain solubility; when acid, in especially strong acid is used as catalyst, polycondensation reaction can be performed at a higher temperature under the condition that the ratio of formaldehyde to phenol is higher and thermoplastic phenolic resin can be obtained; and then strong alkali is added to continuously react at a higher temperature and form phenolic resin which has a certain solubility in water.
Description
Technical field [0001] The invention relates to a preparation method of a phenolic resin, in particular to a preparation method of a water-dispersed phenolic resin, and belongs to the field of polymer material synthesis. Background technique [0002] Phenolic resin refers to the resin obtained by the condensation reaction of phenols and aldehydes, and also generally refers to the unprocessed and shaped polymer compounds synthesized from phenols and aldehydes through chemical engineering. Among them, the phenolic resin is obtained by polycondensation of phenol and formaldehyde. The resin is the most important. Phenolic resin is the earliest industrialized synthetic resin. Because of its easy-to-obtain raw materials, convenient synthesis, and the performance of the resin after curing can meet many requirements for use, it is widely used in industry. [0003] The resin obtained by the condensation reaction of phenol and formaldehyde is classified into novolac and resole according to ...
Claims
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IPC IPC(8): C08G8/10
Inventor 李明远赵丹孙丽梅彭勃林梅钦
Owner CHINA UNIV OF PETROLEUM (BEIJING)