Method for preparing oligomeric rosin by taking slash pine rosin as raw material

Abstract

The invention discloses a method for preparing oligomeric rosin by taking slash pine rosin as a raw material. Preparation processes comprise the following steps of: melting the slash pine rosin into liquid-state rosin in a melting tank by heating; putting the liquid-state rosin into a reaction kettle and heating the liquid-state rosin; and extracting a substance with a low boiling point from the rosin under a vacuum condition. Under the vacuum condition, a vacuum degree is required to be at least -0.080 MPa. In a heating process, a catalyst in an amount which is 0.05 to 0.5 weight percent that of the rosin and a stabilizer in an amount which is 0.05 to 0.5 weight percent that of the rosin are added. The oligomeric rosin is prepared by polymerizing and stabilizing the slash pine rosin which serves as the raw material in vacuum at a high temperature. Without a solvent in the conventional method, the method has the characteristics of safe production and low cost. The main performance of the product of oligomeric rosin is moderate softening point, so that the oligomeric rosin is very suitable to be used as the raw material for a hot melt adhesive. Compared with the oligomeric rosin prepared by the conventional method, the product has lower acid value and lighter color.

Description

technical field [0001] The invention relates to a method for preparing oligomeric rosin by using wetland pine rosin as a raw material, in particular to a method for preparing oligomeric rosin by thermal polymerization of wetland pine rosin under high vacuum and high temperature conditions, and belongs to the field of new materials. Background technique [0002] Rosin is a valuable renewable resource and a very important forest chemical product. The supply of rosin and its deep-processed products is stable, and it has become an indispensable raw material for the production of adhesives, coatings, inks and other products; it is widely used in paint, paper, soap, food, medicine, pesticides, electronics and many other fields. Rosin is a complex mixture of various resin acids, a small amount of fatty acids, and neutral substances, in which acidic substances account for about 90% (mainly resin acid isomers, and a small amount of fatty acids), and neutral substances account for abo...

AI Technical Summary

Problems solved by technology

It has complex process, produces a large amount of acid residue and acid-containing wastewater, and the loss of solvent in the process is large, which causes great environmental pollution.

And the softening point of the polymerized rosin produced by the traditional method is 110-145°C. The polymerized rosin with too high softening point will have a problem in the application of hot melt adhesives, that is, the polymerized rosin with a high softening point will soften after being made into a rosin-modified resin. The point is also high, and there will be incomplete melting, deposition, and clogging in the production process of the hot melt adhesive; even if the hot melt adhesive is barely made, the glue surface will be uneven during the hot melt adhesive coating process , there are particles, poor fluidity and other adverse conditions

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