Alkyd resin depolymerizing agent as well as preparation method and use method thereof

Abstract

The invention belongs to the technical field of resin depolymerizing agents, and particularly relates to an alkyd resin depolymerizing agent as well as a preparation method and a use method thereof. The depolymerizing agent is prepared from the following raw materials in parts by weight: 70-85 parts of organic unit acid, 15-30 parts of high-boiling-point solvent and 1-3 parts of defoaming agent. The invention also discloses a preparation method and a use method of the depolymerizing agent. Compared with the prior art, the invention has the following beneficial effects: the use amount of the emergency material required by the invention is small, the reaction is rapid, the feeding is convenient, the alkyd resin can be timely prevented from further reaction thickening during excessive polymerization, the resin is prevented from gelling in a reaction kettle, and the depolymerization effect on the gelling alkyd resin is also good; the depolymerizing agent is liquid, is convenient to operate during production and has no influence on production safety, and after the depolymerizing agent is added, the over-sticky resin can be reused, so that the generation of dangerous waste products is reduced.

Description

Technical field [0001] The present invention belongs to the field of resin depolymerization agent technology, particularly relates to an alkyd resin depolymer and its preparation method, method of use. Background [0002] Alkyd resin is usually polymerized by polyols, polyacids, greases, unit acids, etc., the resin in the polymerization esterification, if improper control or wrong material, there may be excessive polymerization or gelling phenomenon, and alkyd resin excessive polymerization or gelatinization, light caused by quality degradation, product scrapping, heavy leading to resin gelatinization in the reactor, can not be discharged, equipment scrap, and even safety accidents. [0003] There have been other reports on the treatment method of gelatinization of polyester resin, the process is to depolymerize the gelatinized or ilkyominated resin with several times the polyol of the acid and phthalic anhydride equivalent in the resin, the amount of degraded material (polyol) u...

AI Technical Summary

Problems solved by technology

[0002] Alkyd resins are usually polymerized from polyols, polybasic acids, greases, unit acids, etc. During the polymerization and esterification of the resin, if the resin is not properly controlled or the wrong materials are used, excessive polymerization or gelation may occur, while alkyd resins Excessive polymerization or gelation, light cases will cause quality degradation, product scrapping, serious cases will cause resin gelation in the reactor, unable to discharge materials, equipment scrapping, and even safety accidents

[0003] There are other reports about the treatment method of polyester resin gelling. The process is to depolymerize the gelled or about to be gelled resin with polyols that are several times the equivalent of acid and phthalic anhydride in the resin. The degradation materials used in this method (Polyol) is used in a large amount, and for most reactors with little remaining space, the processing conditions required by this method cannot be met

In addition, if the degraded material in this method is solid, at the critical moment when the resin is about to gel, due to the reflux solvent in the reactor, when the lid of the reactor is opened, a large amount of high-temperature solvent vapor will emerge, which is not convenient for timely feeding. Rescue in the reactor

[0004] There are also other reports that use a small amount of polyol to degrade the alkyd resin that is about to gel, but the degradation speed of this method is slow and the effect is not good. If the gelation caused by excessive polybasic acid, it will be accelerated when a small amount of polyol is added. The alkyd resin in the kettle is gelled, which is not conducive to depolymerization