Microencapsulation of formaldehyde scavenger agent and its application to veneered panels

摘要

Formaldehyde scavenger agent can effectively control formaldehyde emissions from wood-based panels, but the existing formaldehyde scavenger agent can only work in the short term. For the purpose of long-term control of formaldehyde emissions from wood-based panels, microencapsulation of formaldehyde scavenger agent was synthesized in this paper. The effect of the emulsifying agent and the core to shell ratio on the microcapsules' morphology and formaldehyde degradation efficiency was investigated. The results showed that microcapsules of optimum morphology with high degradation efficiency can be obtained under the condition of 1% of the sodium dodecyl sulfate emulsifier, 3% of the shell solution, and a core to shell ratio of 1:3 with 1000 r/min stirring speed. The loading ratio and efficiency of the microcapsules achieved 36.25% and 8.05% respectively. Compared with control panels, the formaldehyde released from veneered panels treated with microcapsules was 39.7% and 41.4% lower in short-term and long-term emissions.