Development of polyvinyl acetate emulsion with reactive PVA as protective colloid and investigate its reactivity

以反应性PVA为保护胶体的聚醋酸乙烯乳液的研制及其反应性研究

• 批准号: 16580130
• 负责人: YAMADA Masaaki
• 金额: $ 2.11万
• 依托单位: Shizuoka Univ.
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16580130/
• 关键词: non-formaldehyde adhesive; water based emulsion; reactive PVA; isocyanate chemical compound; dynamic viscoelasticity; wood adhesion; crosslink; environmental corespondence; PMDI; 耐水性能

Recently, acetoacetylated PVA (AAPVA) that replaced the reactive acetoacetyl group with part of the PVA side-chain was introduced, and waterproof type polyvinyl acetate emulsion (EPVAc) that uses it as the protective colloid of the emulsion adhesive was synthesized due to investigate the characteristic of this EPVAc. Its physical property and wood bonding performance was investigated.1)It was proven that dissolution and hygroscopicity of EPVAc films with AAPVA as the protective colloid were improved. And, it was proven that the degree of the plasticization of films by the moisture absorption was low and that it holds the lowering of the storage modulus by the heating treatment for EPVAc films with AAPVA as the protective colloid.3)The waterproof performance of EPVAc using AA PVA was higher than EPVAc using normal PVA, and the wood bonding performance was rapidly improved, especially in the case of the heating treatment at 120℃.And using acetoacetylated (AA) PVA with various degrees of acetoacetylation and ordinary partially saponified PVA, the following facts were obtained as the result of examining the reactivity with an added isocyanate compound (pMDI) in AA PVA aqueous solution and the formation of crosslinking by heat treatment as compared with ordinary PVA.1)The rate of consuming NCO groups in the PVA aqueous solution was higher with AA PVA than with ordinary PVA. The reactivity of the AA group in AA PVA for the NCO group in pMDI was higher than that of the OH group.2)The crosslinking density of PVA, which was calculated from the E' value of the rubber flat region of the cured film, increased with the degree of acetoacetylation.The ability of the PVA aqueous solution to bond wood improved by the addition of pMDI. Curing at 120℃ resulted in superior waterproof adhesion for AA PVA.

近年来，为了研究聚醋酸乙烯酯乳液（EPVAc）的特性，引入了乙酰乙酰化聚乙烯醇（AAPVA），将其侧链上的乙酰乙酰基取代，合成了防水型聚醋酸乙烯酯乳液（EPVAc），并将其用作乳液胶粘剂的保护胶体。结果表明：1）以AAPVA为保护胶体，EPVAc薄膜的溶解性和吸湿性得到改善。并且，以AAPVA为保护胶体的EPVAc薄膜，其吸湿增塑程度较低，并保持了因热处理引起的储能模量的降低。3）使用AA PVA的EPVAc的防水性能高于使用普通PVA的EPVAc，木材粘接性能得到迅速改善。特别是在120℃热处理的情况下，用不同乙酰乙酰度的乙酰乙酰化（AA）PVA和普通部分皂化PVA，作为检验与添加的异氰酸酯化合物（pMDI）的反应性的结果，获得以下事实：1）AA PVA水溶液中NCO基团的消耗速率高于普通PVA。2）PVA的交联密度（由固化膜橡胶平坦区的E'值计算）随乙酰乙酰化度的增加而增加，加入pMDI后PVA水溶液的胶合能力提高。在120℃固化时，AA/PVA具有良好的上级防水粘接性能.

项目成果

アセトアセチル化PVAを保護コロイドとしたアクリル樹脂エマルジョンの物性と木材接着性能(1)

以乙酰乙酰化PVA为保护胶体的丙烯酸树脂乳液的物理性能及木材附着力性能（1）

• 发表时间: 2004
• 期刊: 日本接着学会第42回年次大会講演要旨集
• 作者: 篠原弘樹;山田雅章他4名
• 通讯作者: 山田雅章他4名

アセトアセチル化PVAを保護コロイドに使用した酢酸ビニル樹脂エマルジョンの物性と接着性

以乙酰乙酰化PVA为保护胶体的醋酸乙烯树脂乳液的物理性能和粘合性能

• 期刊: 木材学会誌 投稿中
• 作者: 山田雅章;滝欽二;吉田弥明;江崎竜彦
• 通讯作者: 江崎竜彦

アセトアセチル化PVAを保護コロイドとしたアクリル樹脂エマルジョンの物性と木材接着性能(2)

以乙酰乙酰化PVA为保护胶体的丙烯酸树脂乳液的物理性能及木材粘合性能（2）

• 发表时间: 2004
• 期刊: 第54回日本木材学会大会研究発表要旨集
• 作者: 篠原弘樹;山田雅章他4名
• 通讯作者: 山田雅章他4名

Physical properties and wood bonding performance of polyvinyl acetate emulsion with acetoacetylated PVA as protective colloid

以乙酰乙酰化PVA为保护胶体的聚醋酸乙烯乳液物理性能及木材粘结性能

• 期刊: Mokuzai gakkaisi (in press)
• 作者: Masaaki Yamada;Kinji Taki;Tastuhiko ezaki
• 通讯作者: Tastuhiko ezaki

アセトアセチル化PVAを保護コロイドとしたアクリル樹脂エマルジョンの物性と木材接着性能(3)

以乙酰乙酰化PVA为保护胶体的丙烯酸树脂乳液的物理性能及木材粘合性能（3）

• 发表时间: 2005
• 期刊: 第55回日本木材学会大会研究発表要旨集 (発表予定)
• 作者: 山田雅章;滝 欽二;渋谷光夫;山田雅章他4名
• 通讯作者: 山田雅章他4名