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首页> 外文期刊>Pro Ligno >CEMENT AS AN INORGANIC BINDER FOR THE PRODUCTION OF FORMALDEHYDE-FREE BONDED PLYWOOD
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CEMENT AS AN INORGANIC BINDER FOR THE PRODUCTION OF FORMALDEHYDE-FREE BONDED PLYWOOD

机译：水泥作为无机粘结剂生产无甲醛胶合板

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For the bonding of veneers into plywood, formaldehyde-containing amino resins are mainly used. The advantages of these adhesives are good properties (e.g. fast curing), high availability, acceptable price and a mature technology. The formaldehyde emission (FE) is the major disadvantage of these adhesives. The limit of FE for wood-based panels has been reduced more and more in recent years. With the decision of the European Union from 1 January 2016, formaldehyde was obligatorily classified as carcinogenic and mutagenic. The result of this decision is a further reduction of FE limits for manufacturing and use of wood-based panels. Without expensive adhesive systems or coatings, plywood and its production will not comply with these limits in the future.Prospectively, the use of formaldehyde-containing adhesives will become uneconomical. For this reason, studies for bonding wood veneers with formaldehyde-free Portland cement were carried out. Ordinary Portland cement (OPC) is widely available, inexpensive and is in use in various industries including the wood-based panel industry (e.g. Cement-bonded particle board = CBPB). A new product called “cement-bonded plywood (CBPly)” combines the advantages of organically-bonded plywood (e.g. great strength, low density) and CBPB (e.g. low FE, high fire resistance).In contrast to well-known cement-bonded composites based on wood particles (CBWC) like CBPB, cement-bonded wood-wool boards or wood-fibre-reinforced cement boards, the amount of wood is much higher in CBPly, since the cement is only located between the layers of wood (more specific information). The veneers ensure a high tensile strength of the material. This provides better bending properties compared to other particle-based CBCs. In addition to the increased strength, the handling and machinability is improved due to the lower density and lower cement content. Results from cone calorimeter tests indicate that if cement is also applied to the top veneers, the CBPly can be classified as Euroclass B (EN 13501-1).Due to the advantageous properties of CBPly, markets can be developed that are difficult or inaccessible for organically-bonded plywood and CBPB. Especially the use in applications with high demands on fire resistance and low emissions are regarded.
机译：为了将单板粘合到胶合板上，主要使用含甲醛的氨基树脂。这些粘合剂的优点是良好的性能（例如快速固化），高可用性，可接受的价格和成熟的技术。甲醛释放量（FE）是这些粘合剂的主要缺点。近年来，人造板的FE限度越来越少。根据欧洲联盟从2016年1月1日起的决定，甲醛被强制分类为致癌和诱变。该决定的结果是进一步降低了人造板制造和使用中的FE限制。如果没有昂贵的粘合剂体系或涂料，胶合板及其生产将不符合这些限制。将来，含甲醛的粘合剂的使用将变得不经济。因此，进行了将木饰面与无甲醛硅酸盐水泥粘合的研究。普通波特兰水泥（OPC）广泛可用，价格便宜，并且在包括人造板行业在内的各种行业中使用（例如，水泥粘合刨花板= CBPB）。一种名为“水泥粘合胶合板（CBPly）”的新产品结合了有机粘合胶合板（例如强度高，密度低）和CBPB（例如低FE，高耐火性）的优势。与众所周知的水泥粘合基于木材颗粒（CBWC）的复合材料，例如CBPB，水泥粘合的木羊毛板或木纤维增强的水泥板，CBPly中的木材含量要高得多，因为水泥仅位于木层之间（更多具体信息）。饰面确保材料的高抗拉强度。与其他基于粒子的CBC相比，这提供了更好的弯曲特性。除了增加强度外，由于较低的密度和较低的水泥含量，操作性和切削性也得到了改善。锥形量热仪测试的结果表明，如果还将水泥也应用于顶层饰面，则CBPly可以归类为B级欧洲标准（EN 13501-1）。由于CBPly的优越性能，可以开发出难以或无法进入的市场有机胶合板和CBPB。特别是考虑了对耐火性和低排放有很高要求的应用。

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