Composite foaming agent for urea-formaldehyde resin, preparing method and application thereof

Abstract

The present invention discloses a composite foaming agent for urea-formaldehyde resin, a preparing method and an application thereof. The composite foaming agent of the invention is composed of a foaming agent, a foam stabilizer and a dispersing agent. After the composite foaming agent is added into the urea-formaldehyde resin additive, the volume of the urea-formaldehyde resin can be increased for 2-3 times for forming the fine, uniform and long-lasting foamed urea-formaldehyde resin, effectively regulating the surface tension of the glue solution, reducing the conglobation phenomenon of flour, increasing the fluidity of the urea-formaldehyde resin, settling the adverse phenomena of glue bleeding, glue leakage, non-homogeneous adhesive layer, etc. which commonly exist in the prior urea-formaldehyde resin adhesive, so that the urea-formaldehyde resin on the plate blank of the veneer board has excellent homogeneity and the bleeding balancing is kept and the total usage of flour and theurea-formaldehyde resin after adhesive mixing is reduced for 10-30%. Additionally, the composite foaming agent of the invention has the advantages of excellent safety, no adverse effect in the using process and capability for effectively reducing the release amount of the formaldehyde of the artificial board. Furthermore the mechanical properties of the prepared artificial board can equally obtainthe requirement of the national standard.

Description

technical field [0001] The present invention relates to a composite foaming agent and a preparation method thereof, in particular to a composite foaming agent for urea-formaldehyde resin adhesives used in the manufacture of wood-based panels and a preparation method thereof. The present invention also relates to urea-formaldehyde containing the composite foaming agent The invention relates to a resin adhesive and its application in manufacturing wood-based panels, belonging to the field of wood adhesive additives. Background technique [0002] Over the past 30 years of reform and opening up, China's wood industry has developed rapidly, especially the production and consumption of wood-based panels has ranked first in the world. As a major producer of wood-based panels in the world, China's wood-based panel production reached 88.3858 million cubic meters in 2007, an increase of 18.98% over 2006, and the growth rate remained stable. Correspondingly, my country's wood adhesive...

AI Technical Summary

Problems solved by technology

The existing adhesive foaming technology is generally suitable for low-viscosity, urea-formaldehyde resin without adding flour, and needs to increase special foaming equipment (rotating speed needs to be greater than 2000r / min) (for example, the invention patent with publication number CN1907552A), which is very important for mechanization Low-level plywood production enterprises undoubtedly need to increase investment in equipment and training operators. In addition, because the foam durability is not good enough, it cannot meet the needs of long operating times in plywood production.

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