THE RESEARCH OF THE STRENGTH OF ASH THERMOWOOD ADHESIVE JOINTS TREATED BY VACUUM-CONDUCTIVE THERMAL PROCESSING TECHNOLOGY
| Autor: | V.R. Solonynka, Yu. M. Huber, Zh.Ya. Humenyuk, М.M. Ilkiv |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
chemistry.chemical_classification
Bonding process Materials science Thermoplastic technology industry and agriculture complex mixtures Durability Graph Experimental research chemistry.chemical_compound chemistry General Earth and Planetary Sciences Hemicellulose Adhesive Composite material GLUE General Environmental Science |
| Zdroj: | Scientific Bulletin of UNFU. 27:136-139 |
| ISSN: | 2519-2477 1994-7836 |
| DOI: | 10.15421/40270330 |
| Popis: | Thermowood is a relatively new material, which is being increasingly used for the manufacturing of products designed for use both from outside and inside the premises. However, due to changes in the wood chemical composition, due the action of high temperature and the relative novelty, this problem of the ability of such wood to gluing is not explored enough. This causes the purpose of the research. Consequently, the method of ash thermowood treating by vacuum-conductive thermal processing technology and regime bonding process parameters is presented. The authors have described the method of temperature-humidity cycle load experimental models and the method of experimental research of the strength of adhesive joints formed using thermoplastic adhesives based on polyvinylacetate (PVA) variance from thermowood of ash. The authors have also designed graph dependence of change strength of adhesive joints of ash thermowood on temperature of the heat treatment. Based on the results of experimental studies the connection strength formed by thermoplastic adhesives based on polyvinylacetate (PVA) variance from ash thermowood (durability class D3), in chipping along the fibers, we have found that the average value of strength adhesive joints of ash wood treated at 160 °C during 4 hour period, in chipping along the fibers decreased by 68.5 % compared to the strength adhesive joints of untreated wood. The average value of strength adhesive joints of ash wood treated at 220 °C during 4 hour period, in chipping along the fibers decreased by 42.1 % compared to the strength of adhesive joints of untreated wood. It is found that some thermowood inability to form strong adhesive joints can explaine thermal degradation of wood (decomposition and excretion of extractives substances and hemicellulose) to cause significant reduction of intermolecular bonds between glue and wood. Our results showed that the adhesive joints of ash thermowood, formed by thermoplastic adhesives based on polyvinylacetate (PVA) variance are not sturdy and durable. Thus, we should conclude that it is necessary to make efforts to modification and receiving of new thermoplastic formulations based on glue PVA variance that would be provided with necessary indicators of strength and durability of the glue thermowood joints. |
| Databáze: | OpenAIRE |
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