Modified phenolic resin as well as preparation method and application thereof
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A phenolic resin and modification technology, which is applied in the field of modified phenolic resin and its preparation, can solve problems such as limiting the application of phenolic resin, affecting resin performance, and VOC volatilization, so as to improve flexibility, increase paint film thickness, and reduce brittleness Effect
Active Publication Date: 2022-01-11
ELANTAS ZHUHAI CO LTD
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In addition, the use of a large amount of organic solvents will also cause VOC volatilization, which will have an impact on the environment; and if water is used as a solvent, in order to ensure the water solubility of the phenolic resin, the molecular weight of the phenolic resin must be controlled to be relatively small, which will affect the resin after curing. performance
The high rigidity of phenolic resin also makes it easy to crack, which limits the application of phenolic resin
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Embodiment 1
[0042] A preparation method of modified phenolic resin, comprising the following steps:
[0043] In parts by weight, take 100 parts of phenol, 6.2 parts of paraformaldehyde, 7 parts of boric acid, and 23 parts of hydroxyethyl acrylate and add them to the first reaction kettle, start stirring, and after stirring evenly, heat up to 150°C for condensation reaction; test the reaction until the viscosity reaches 10.0-15.0poise (BROOKFIELD viscometer 5# rotor, the test temperature is 80 ℃), stop the reaction, and prepare the modified phenolic resin.
Embodiment 2
[0045] A preparation method of modified phenolic resin, comprising the following steps:
[0046] In parts by weight, take 100 parts of phenol, 8.5 parts of paraformaldehyde, 8 parts of boric acid, and 26 parts of hydroxyethyl acrylate and add them to the first reaction kettle, start stirring, and after stirring evenly, heat up to 150°C for condensation reaction; test reaction until the viscosity reaches 10.0-15.0poise (BROOKFIELD viscometer 5# rotor, the test temperature is 80 ℃), stop the reaction, and prepare the modified phenolic resin.
Embodiment 3
[0048] A preparation method of modified phenolic resin, comprising the following steps:
[0049] In parts by weight, take 100 parts of p-tert-butylphenol, 75 parts of furfural, 23 parts of tributyl borate, and 28 parts of hydroxypropyl methacrylate into the first reaction kettle, start stirring, and after stirring evenly, heat up to 150 Condensation reaction at ℃; test the viscosity of the reactant until the viscosity reaches 10.0-15.0poise (BROOKFIELD viscometer 5# rotor, the test temperature is 80 ℃), stop the reaction, and obtain the modified phenolic resin.
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Abstract
The invention belongs to the technical field of coating preparation, and discloses modified phenolic resin as well as a preparation method and application thereof. The modified phenolic resin is prepared from the following raw materials: a phenolic compound, an aldehyde compound and a hydroxyl compound containing unsaturated bonds. According to the invention, unsaturated groups are introduced into phenolic resin, so that the modified phenolic resin can be copolymerized with an unsaturated monomer diluent. When an unsaturated monomer is used as a diluent to prepare the insulating paint, the viscosity of the insulating paint can be adjusted without adding volatile solvents such as water, so that the construction is convenient; besides, the modified phenolic resin can reduce the brittleness of the film layer and improve the flexibility; meanwhile, the unsaturated monomer diluent can participate in film formation of the insulating paint and does not volatilize, so that the film-forming property and the thickness of a paint film can be improved. The solid content of the prepared insulating paint is as high as 100%, and the paint has good mechanical performance and electrical performance.
Description
technical field [0001] The invention belongs to the technical field of paint preparation, and in particular relates to a modified phenolic resin and its preparation method and application. Background technique [0002] Phenolic resin is one of the most commonly used resins in the field of electrical insulation. It has certain advantages and disadvantages in its application in the electrical field. Its advantages are high heat resistance, high hardness, good corrosion resistance, high bonding strength, high insulation, and low smoke and low toxicity when burning. However, due to the high hardness and strong rigidity of phenolic resin, in the synthesis process, in order to prevent the resin from solidifying and stirring, a large amount of solvent or water must be added, which makes it impossible to make phenolic resin into high-solid paint. Low solid content is not conducive to hanging paint, and it is difficult to increase the thickness of the paint film. It often requires ...
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