Glues from reactive urea solvents assigned for composite wood products manufacturing

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Stanisław Proszyk, Zygmunt Wirpsza, Mariusz Jóźwiak, Witold Jabłoński 
Poznań, Instytut Technologii Drewna, 2003
ISBN 83-915727-3-0

(Polish language version)

CONTENTS

List of abbreviations and definitions 5
Foreword 9
1. Introduction 13
    1.1. Characteristic and importance of UF glue resins in the wood industry 13
    1.2. Hardening and aging processes of UF glue resins 14
    1.3. Justification of purposefulness in taking up the research subject matter
          and conceptual guidelines
16
2. Development of reactive urea solvents (RS) 18
    2.1. Research deliberation 18
          2.1.1. Analysis of the synthesis reaction course 19
          2.1.2. Influence of semi-formal group condensation on the structure and properties
                   of RS
22
    2.2. Obtaining of RS 23
          2.2.1. Experimental part 23
                   2.2.1.1. Raw materials 23
                   2.2.1.2. Laboratory equipment 24
                   2.2.1.3. Research and analyses methods 25
          2.2.2. General procedure for obtaining of MoFn 25
                   2.2.2.1. Synthesis of anhydrous MoF6 and MoF9 26
                               2.2.2.1.1. Stability 26
                               2.2.2.1.2. Quality assessment 26
                   2.2.2.2. Summary 27
    2.3. Production of MoF9 on a laboratory scale 28
          2.3.1. General deliberation 28
          2.3.2. Obtaining of MoF9 using various formalin neutralizing agents 30
                   2.3.2.1. Synthesis in the presence of NaOH 30
                   2.3.2.2. Synthesis in the presence of MgO 33
                   2.3.2.3. Summary 33
          2.3.3. Attempts at lowering the softening temperature of MoF9 34
                   2.3.3.1. Influence of the presence of water 34
                   2.3.3.2. Influence of the chosen modifiers (SOTP) 35
                   2.3.3.3. Influence of the presence of urea 38
          2.3.4. Summary 40
    2.4. Production of MoF9(4,5) on a laboratory scale 41
          2.4.1. Synthesis in the presence of borax (MoF9/4,5Bo11) 41
          2.4.2. Synthesis in the presence of borax-phosphate buffer (MoF9-bBo-1) 43
          2.4.3. Chemical structure 44
          2.4.4. Formaldehyde emission from hardened MoFn films 48
          2.4.5. Summary 49
    2.5. Production of MoF9/4,5 in semi-technical conditions with the use of periodical
          and continuous condensation
50
          2.5.1. Course of MoF9 synthesis 50
          2.5.2. MoF9 condensation and obtaining of MoF9/4,5 50
                   2.5.2.1. Periodical distillation 51
                   2.5.2.2. Continuous distillation 51
3. Tests of the chosen properties of MoFn 53
    3.1. Rheology characteristics 53
          3.1.1. Introduction 53
          3.1.2. Experimental part 54
          3.1.3. Test results 54
    3.2. Tests of adhesion of a glue based on MoF6 and MoF9 resins for wood 60
          3.2.1. Theoretical deliberation 60
          3.2.2. Experimental part 62
          3.2.3. Test results 62
4. Application of MoFn for the production of the chosen composite wood products 69
    4.1. Properties of resins and UF glue masses made from MoFn 69
          4.1.1. Resins 69
                   4.1.1.1. Analysis of liquid and hardened resins by means of FTIR spectroscopy 71
          4.1.2. Reactivity of glue masses 74
    4.2. Plywood 76
    4.3. Particle boards 80
5. Closing summary 83
Literature 85
Summary 93