Topochemistry on the Property Enhancement of Wood with Inorganic Materials

无机材料增强木材性能的拓扑化学

• 批准号: 06453176
• 负责人: SAKA Shiro
• 金额: $ 4.8万
• 依托单位: KYOTO University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06453176/
• 关键词: Wood-inorganic composite; Topochemistry; Property enhancement; Metal alkoxide; SiO_2-P_2O_5-B_2O_3; Fire-resisting property; Sol-gel process; Silicon alkoxide oligomer; SiO_2-P_2O_5-B_20_3; 有機ケイ素化合物

From our study on wood-inorganic composites by the sol-gel process, SiO_2 wood-inorganic composites from tetraethoxysilane (TEOS) were found to be enhanced in dimensional stability, fire-resistance and so on. To improve their properties further, multicomponent SiO_2-P_2O_5-B_2O_3) wood-inorganic composites were studied in a reaction system of TEOS/EtOH/acetic acid to which trimethylphosphite (TMP) and trimethylborate (TMB) were added. Obtained SiO_2-P_2O_5-B_2O_3 composites were superior in fire-resistance. However, (1) P_2O_5 and B_2O_3 gels are not stable against weathering and (2) TMP is not acceptable in terms of safety in environment for its production due to its offensive oder. For the problem of (1) , HFOETMOS (2-heptafluorooctylethyltrimethoxysilane) was added in a small quantity to the reaction system (1/2,000 in the molar ratio to TEOS). Concomitantly, water-repellent property was added to prevent the composites from a leaching of P_2O_5 and B_2O_3 gels. Furthermore. for (2) … More , silicon alkoxide oligomers instead of TEOS to which TMP and TMB were hydrolized and condensed, were used for preparing SiO_2-P_2O_5-B_2O_3 composites. By doing so, the production environment was improved. Additionally, this modified oligomers are so stable due to covalent bonds among Si, P,and B components that obtained SiO_2-P_2O_5-B_2O_3 gels were resistant against their leaching, and very effective for fire-resistance of wood. SiO_2 wood-inorganic composites prepared from the above reaction system to which phosphorus-containing fire-resistant agents and a small amount of HFOETMOS were added, also revealed antileachability and high fire-resistance of wood.On TiO_2 wood-inorganic composites, composites with various types of TiO_2 distribution were prepared from titanium alkoxides and titanium chelates. Among tem, TiO_2 composites in which TiO_2 gels are distributed only within the cell walls were found to be enhanced in dimensional stability and fire-resistance, indicating that the topochemical effects exist on the property-enhancement of wood. Less

通过对溶胶-凝胶法制备木材-无机复合材料的研究，发现以正硅酸乙酯(TEOS)为原料制备的SiO_2木材-无机复合材料在尺寸稳定性、耐火性等方面都得到了提高。为进一步改善SiO_2-P_2O_5-B_2O_3多元木材-无机复合材料的性能，在加入亚磷酸三甲酯(TMP)和硼酸三甲酯(TMB)的正硅酸乙酯/乙醇/醋酸反应体系中进行了研究。制得的SiO_2-P_2O_5-B_2O_3复合材料具有较好的耐火性能。然而，(1)P_2O_5和B_2O_3凝胶对风化不稳定；(2)TMP由于其具有攻击性的顺序，在环境安全方面是不能接受的。对于(1)的问题，在反应体系中加入少量的HFOETMOS(2-七氟辛基乙基三甲氧基硅烷)(与TEOS的摩尔比为1/2,000)。同时，还增加了憎水性能，以防止P_2O_5和B_2O_3凝胶的渗漏。更重要的是。用于(2)…此外，用硅烷氧基齐聚物代替TMP和TMB水解缩合成的正硅酸乙酯，制备了SiO_2-P_2O_5-B_2O_3复合材料。通过这样做，改善了生产环境。此外，这种改性低聚物由于Si、P和B组分之间的共价键而非常稳定，得到的SiO_2-P_2O_5-B_2O_3凝胶具有很好的抗浸出性，对木材的阻燃非常有效。在上述反应体系中加入含磷阻燃剂和少量的HFOETMOS制备的SiO_2木材-无机复合材料，也表现出木材的抗渗滤性和高阻燃性。在TiO_2木材-无机复合材料中，以钛醇盐和钛的络合物为原料制备了不同类型的纳米二氧化钛复合材料。在TEM中，二氧化钛凝胶只分布在胞壁内的二氧化钛复合材料的尺寸稳定性和耐火性都得到了提高，表明表面化学效应对木材性能的改善是存在的。较少

项目成果

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Saka, S.：“木材和纤维素化学，第二版”Marcel Dekker, Inc. New Youk，1400 (1997)

Saka, S.: "Wood-Inorganic Composites Prepared by the Sol-Gel Process and Topochemistry for their Property Enhancement." Mokuzai Kogyo. 50. 400-406 (1995)

Saka, S.：“通过溶胶-凝胶工艺和拓扑化学制备木材-无机复合材料，以增强其性能。”

Saka, S.: "Handbook of New Woody Materials" Gihodo Publisher. 750 (1996)

Saka, S.：“新木质材料手册”Gihodo 出版社。

Saka, S.: "Wood-Inorganic Composites Prepared by the Sol-Gel process VI." Mokuzai Gakkaishi. 42. 81-86 (1996)

Saka, S.：“通过溶胶-凝胶工艺 VI 制备的木材-无机复合材料。”

坂志朗: "木質新素材ハンドブック" 木質新素材ハンドブック編集委員会編、技報堂出版, 750 (1996)

坂四郎：《新木质材料手册》，新木质材料手册编辑委员会编，Gihodo Publishing，750（1996）