UV-curable polyurethane prepolymer and photoinitiator 1173 were facilely encapsulated in a poly（urea-formaldehyde） shell, which was in situ formed by the polymerization of formalde-hyde and urea in an oil-in-water e...UV-curable polyurethane prepolymer and photoinitiator 1173 were facilely encapsulated in a poly（urea-formaldehyde） shell, which was in situ formed by the polymerization of formalde-hyde and urea in an oil-in-water emulsion. The diameters of the microcapsules ranged from 118 μm to 663 μm depending on agitation speed, and were obtained via optical mi-croscopy and scanning electron microscopy analyses. The encapsulation percent and the yield of microcapsules prepared at the agitation speed of 600 r/min can reach 97.52wt% and 65.23wt%, respectively. When the water-borne polyurethane （WPU） coating embedded with the prepared microcapsules were scratched, the healing agent could be released from rup-tured microcapsules and lled the scribed region. The excellent anticorrosion properties of the WPU coating embedded with the prepared microcapsules were con rmed by the results obtained from both electrochemical impedance spectroscopy and Tafel curves.展开更多
In order to gain the drying characteristics of improved-preservative treated rubberwood, the 100℃ drying test method was used. Based on the test results, rubberwood drying schedules for lab test were made out. Then a...In order to gain the drying characteristics of improved-preservative treated rubberwood, the 100℃ drying test method was used. Based on the test results, rubberwood drying schedules for lab test were made out. Then a series of lab experiments were conducted in a wood drying trial machine, and finally 3 optimized drying schedules for improved-preservative treated rubberwood were gained. And a series of follow-up pilot tests were executed in a rubber wood mill in Hainan province. Results showed that rubberwood with or without pith should be dried separately. Pith free rubberwood could be dried according to the high temperature Schedule C with good drying quality. Uniform spacing stickers and heavy load on top of stack was recommended to reduce deformation. In order to keep the original color of rubberwood, the rubberwood should be dried according to Schedule A. And Schedule B can also be adopted according to the requirement of final products of the rubberwood By the manufactory.展开更多
文摘UV-curable polyurethane prepolymer and photoinitiator 1173 were facilely encapsulated in a poly（urea-formaldehyde） shell, which was in situ formed by the polymerization of formalde-hyde and urea in an oil-in-water emulsion. The diameters of the microcapsules ranged from 118 μm to 663 μm depending on agitation speed, and were obtained via optical mi-croscopy and scanning electron microscopy analyses. The encapsulation percent and the yield of microcapsules prepared at the agitation speed of 600 r/min can reach 97.52wt% and 65.23wt%, respectively. When the water-borne polyurethane （WPU） coating embedded with the prepared microcapsules were scratched, the healing agent could be released from rup-tured microcapsules and lled the scribed region. The excellent anticorrosion properties of the WPU coating embedded with the prepared microcapsules were con rmed by the results obtained from both electrochemical impedance spectroscopy and Tafel curves.
文摘In order to gain the drying characteristics of improved-preservative treated rubberwood, the 100℃ drying test method was used. Based on the test results, rubberwood drying schedules for lab test were made out. Then a series of lab experiments were conducted in a wood drying trial machine, and finally 3 optimized drying schedules for improved-preservative treated rubberwood were gained. And a series of follow-up pilot tests were executed in a rubber wood mill in Hainan province. Results showed that rubberwood with or without pith should be dried separately. Pith free rubberwood could be dried according to the high temperature Schedule C with good drying quality. Uniform spacing stickers and heavy load on top of stack was recommended to reduce deformation. In order to keep the original color of rubberwood, the rubberwood should be dried according to Schedule A. And Schedule B can also be adopted according to the requirement of final products of the rubberwood By the manufactory.
