Bio-oil starch adhesive for wood and preparation method

Abstract

The invention relates to a bio-oil starch adhesive for wood, which belongs to the technical field of adhesive preparation. A preparation method comprises the following steps: carrying out acidolysis, oxidation and denaturation on starches by using a hydrochloric acid and an oxidant so as to reduce the molecular weight of the starches and improve the reactivity of the starches; then, adding an emulsifier and a stabilizer into the obtained object, and carrying out graft copolymerization on the obtained mixture and acrylamide under the action of an initiator; adding bio-oil, so that chemical groups on a skeleton structure are modified by using substances such as acid and aldehyde and the like in the bio-oil, thereby obtaining a host adhesive; and finally, adding a crosslinking agent and packing into the host adhesive so as to obtain the bio-oil starch adhesive, wherein the mass part of each raw material component is as follows: 80-120 parts of the starches, 150 parts of the hydrochloric acid, 2-5 parts of the oxidant, 1-3 parts of the emulsifier, 10-20 parts of the stabilizer, 0.3-0.6 part of the initiator, 10-20 parts of the acrylamide, 5-20 parts of the bio-oil, 5-10 parts of the crosslinking agent, and 10-15 parts of the packing. The bio-oil starch adhesive disclosed by the invention can replace a white emulsion and can be widely used in the aspects of wood ornaments, wood processing and artificial boards.

Description

technical field [0001] The invention belongs to the technical field of adhesive preparation, in particular to a method for preparing a bio-oil starch adhesive for wood. Background technique [0002] As a kind of natural adhesive, starch adhesive has the advantages of light weight, no corrosion, no pollution, easy to obtain raw materials, low price, and convenient use. It is widely used for bonding paper, cotton fabrics, trademarks, etc. However, starch adhesives have disadvantages such as low bonding strength and easy mildew when exposed to moisture, which limits the application in the bonding of wood products. In the patent CN201210135823.6, the applicant provides a starch-based adhesive prepared in five steps using bio-oil, mechanically activated starch, glyoxal, oxalic acid, water, oxidant, curing agent polyisocyanate, filler, etc. as raw materials Methods. Firstly, mechanically activated starch is used to prepare starch emulsion, and then it is subjected to acid hydrol...

AI Technical Summary

Problems solved by technology

[0003] The starch used in the first step of the preparation method is mechanically activated starch, which needs to be invested in special starch processing equipment, which will lead to an increase in the cost of the adhesive; in the third and fourth steps of the preparation of the adhesive, glyoxal and emulsion copolymerization, oxalic acid on the starch During esterification, the addition of glyoxal, oxalic acid, sodium hydroxide, etc. will cause pH fluctuations and temperature rises in the reaction system. In these cases, if the process parameters are not adjusted in time, the emulsion will quickly gel and agglomerate, and the process is stable. In the fifth step of the preparation of the adhesive, in order to ensure the water resistance and wet bonding strength of the adhesive, so that its bonding performance is equivalent to that of urea-formaldehyde resin, it is necessary to add a high-priced curing agent isocyanate in the glue mixing process, which reduces the cost of the adhesive. high