UF树脂概述

Chapter : T-10
Basic properties and characteristics of UF resins
Souwest Forestry University Wood Science & Technology Du Guanben Ph.D Professor Guanben@swfc.edu.cn
Introduction
Wood Adhesives
UF Resin
Introduction Synthesis Structure
Performance
Typical application of UF resin as wood adhesives:
OSB – Oriented Strand Board
Chapter : T-10
Basic properties and characteristics of UF resins
Souwest Forestry University Wood Science & Technology Du Guanben Ph.D Professor Guanben@swfc.edu.cn
Conclusions ✓ Relatively good strength
✓ Relatively good durability
Chapter : T-10
✓ Formaldehyde emission
Modern engineer structures around of the world
Basic properties and characteristics of UF resins
Chapter : T-10
Manufacturing of Glulams Basic properties and characteristics of UF resins
Souwest Forestry University Wood Science & Technology Du Guanben Ph.D Professor Guanben@swfc.edu.cn
Introduction ✓ Low cost
Synthesis Structure Performance Modification
✓ Good availability of raw materials
✓ High reactivity relatively fast curing
✓ Clourless glueline ✓ Water solubility
Moon G. Kim. Examination of selected synthesis parameters for typical wood adhesive-type urea-formaldehyde resins by NMR spectroscopy. J.Polymer Sci/J.Appl.Polymer Sci. 19992001
Objective of this Chapter :
To know how to cook and how to use urea-formaldehyde (UF) resin.
Topics:
1. Introduction 2. Synthesis 3. Structure 4. Performance 5. Modification of UF resin 6. Conclusions
Structure
Performance
Modification
Conclusions
Fra Baidu bibliotek
Chapter : T-10
Wood-based Boards Basic properties and characteristics of UF resins
Souwest Forestry University Wood Science & Technology Du Guanben Ph.D Professor Guanben@swfc.edu.cn
Introduction
Wood Adhesives
UF Resin
Introduction Synthesis Structure
Performance Modification
Glulam (MF+UF)
Glulam has greater strength and stiffness than comparable dimensional lumber. Pound for pound, it’s stronger than steel. That means glulam beams can span long distances with minimal need for intermediate supports. In roofs, that gives building designers the flexibility to create large, open spaces without the need for intermediate supports.
Modification
Conclusions
Chapter : T-10
Woodenbased boards Basic properties and characteristics of UF resins
Souwest Forestry University Wood Science & Technology Du Guanben Ph.D Professor Guanben@swfc.edu.cn
Souwest Forestry University Wood Science & Technology Du Guanben Ph.D Professor Guanben@swfc.edu.cn
Introduction
Wood Adhesives
UF Resin
Introduction Synthesis Structure
Introduction
Wood Adhesives
UF Resin
Introduction Synthesis Structure
Typical applications of UF resin as wood adhesives:
Plywood:
Plywood typically is composed of an uneven number of thin layers of wood veneers, called plies, bonded together with an adhesive and with the grain direction of adjacent layers perpendicular to one another. (Terry Sellers, Jr. Plywood and Adhesive Technology)
MDF – Medium Density Fiberboard
den.
LVL – Laminated Veneer Lumber (MF+UF)
An engineered wood product created by layering dried and graded wood veneers with waterproof adhesive into blocks.
UF Resin
Almost 10 billion tons per annum world wide
Cover at least 70% wood panel industry
Introduction
Synthesis
Structure
Performance
Modification
Conclusions
Introduction
Wood Adhesives Urea-Formaldehyde (UF) Resin
Based on the manifold reaction of two monomers, urea and formaldehyde
UF Resin
Advantages or basic characteristics
Wood Adhesives
UF Resin
Introduction
Raw materials Reaction Key factor Instrument
Synthesis
Structure
Performance
Modification
Introduction
Wood Adhesives
UF Resin
Introduction Synthesis
Typical application of UF resin as wood adhesives: Particleboard
Panel material manufactured under pressure and heat from particles of wood (wood flakes, chips, shavings, saw-dust, wafers, strands and similar) and/or other lignocellulosic material in particle form (flax shivers, hemp shivers, bagasse fragments and similar) with the addition of an adhesive.
A.Pizzi. Advanced Wood Adhesives Technology. Marcel Dekker Inc. New York/Basel/Hong Kong. 1994
Forest Products Laboratory: Wood Handbook. USDA Forest Service. Madison, Wisconsin http://www.fpl.fs.fed.us/documnts/fplgtr/fplgtr113/fplgtr113.htm
Performance Modification Conclusions
Literature:
M.Dunky. Urea formaldehyde (UF) adhesive resin for wood. International Journal of Adhesion & Adhesives. 1998, 18:95-107
--M3
Performance
Modification
Conclusions
Chapter : T-10
Woodenbased Boards Basic properties and characteristics of UF resins
Souwest Forestry University Wood Science & Technology Du Guanben Ph.D Professor Guanben@swfc.edu.cn
OSB is manufactured from waterproof heat-cured adhesives and rectangular shaped wood strands that are arranged in cross-oriented layers, similar to plywood.
Glue Laminate (MF+UF)
Production of structural or nonstructural wood members by bonding two or more layers of wood together with adhesive (glue).
Conclusions
Souwest Forestry University Wood Science & Technology Du Guanben Ph.D Professor Guanben@swfc.edu.cn
Introduction
Wood Adhesives Key Factors to Urea-Formaldehyde (UF) Resin