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A kind of preparation method of tung oil modified phenolic resin

A technology of phenolic resin and tung oil, which is applied in the field of phenolic resin modified by tung oil, can solve the problems that the performance of coatings cannot meet the relevant requirements and cannot be used in water-based coatings, and achieve the effects of being suitable for large-scale production, improving flexibility, and increasing hardness

Active Publication Date: 2019-10-29
常州广树化工科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the prior art, the use of tung oil modified phenolic resins is mostly used for mechanical materials or electrical materials, and less involves modified phenolic resins for water-based coatings.
Due to different application purposes, the materials disclosed in the prior art cannot be directly used as the base material of water-based coatings, or even if they can be used as base materials, the performance of the coatings cannot meet the relevant requirements

Method used

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  • A kind of preparation method of tung oil modified phenolic resin

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Comparison scheme
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Embodiment 1

[0021] In this embodiment, the preparation method of tung oil modified phenolic resin is as follows.

[0022] (1) Pretreatment of tung oil: first react 35 parts of tung oil with 10 parts of ethanol at 180±2°C for 1 hour, then add 10 parts of benzoic acid to the reaction product, and continue the reaction for 1 hour at the same temperature to obtain the pretreatment Process tung oil.

[0023] (2) Preparation of the first-order phenolic resin: mix phenol and formaldehyde uniformly according to the molar ratio of 1:1, adjust the pH value to 5.0, raise the temperature to 85°C for 2 hours, and obtain the first-order phenolic resin;

[0024] (3) the tung oil modification of phenolic resin, after the pretreatment tung oil of step (1), the first-order phenolic resin of step (2) and acid anhydride are mixed according to the weight ratio of 5:10:1, adjust the pH value to be 8.0, Raise the temperature to 90°C for 2.5 hours, adjust the pH value to 6.5, and continue the reaction for 1 hou...

Embodiment 2

[0027] The present embodiment refers to the process route of Example 1, and the difference is that propanol is used as the small molecule alcohol in step (1).

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Abstract

The invention relates to the field of high-molecular products used in coatings, and particularly relates to phenolic resin modified by tung oil. Conventionally, phenolic resin modified by tung oil isproduced in a manner of in-situ polymerization modification, which can increase flexibility but reduce dispersibility of the product, so that the product is not suitable for being used as a high-molecular base material for coatings. In the invention, the tung oil is modified with small-molecular monohydric alcohol and aromatic monoacid, and then the tung oil is reacted with first-order phenolic resin, thus producing the phenolic resin modified by tung oil. The product can be dispersed in water to prepare aqueous coatings, wherein on the basis of ensuring excellent performances of the phenolicresin, the capability of better inhibiting cracking in a coating film is achieved.

Description

technical field [0001] The invention relates to the field of polymer products for coatings, in particular to a tung oil-modified phenolic resin. Background technique [0002] Water-based phenolic resin is one of the commonly used coating polymer base materials. It has the advantages of mature synthesis route, good product adhesion, and a large number of active groups for subsequent modification. However, when the water-based phenolic resin coating exists in a thin layer state, its active groups will slowly undergo reactions such as oxidation and self-crosslinking, which will greatly affect the mechanical properties of the coating film, and may lead to greater internal stress of the coating film in severe cases. And cause undesired cracks. [0003] The prior art has reported the technical scheme of using tung oil to modify phenolic resin ("Preparation and performance of tung oil modified phenolic resin", Yuan Xinhua et al., "Journal of Jiangsu University (Natural Science Edi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G8/30C08G8/10
Inventor 陈长福
Owner 常州广树化工科技有限公司