1、The Removal of Formaldehyde from Urea Formaldehyde Adhesive by Sodium
Here, the strongly reducing substance sodium borohydride was used to reduce and degrade the free formaldehyde in UF adhesives, and its effects on the properties of the UF adhesive and plywood were studied.
2、硼氢化钠_百度百科
硼氢化钠（Sodium borohydride），是一种无机化合物，化学式为NaBH4，白色至灰白色结晶性粉末，吸湿性强，其碱性溶液呈棕黄色，是最常用的还原剂之一。
3、Preparation of Graphene and Its Effect on Conductivity Epoxy Resin
High quality graphene and its epoxy composites were prepared by exfoliation of first stage FeCl3-GICs with sodium borohydride (NaBH4) aqueous solution, followed by compounding with epoxy resin.
4、昆明理工大学材料学科2016
[874] K. Zhang, Y. Zhao, X. Dong, R. Li, Cellulose microcrystal improved interphase of ramie fiber-reinforced epoxy resin composites, Polym Composite, 39 (2018).
5、Simple selective reduction by sodium borohydride of an ester
Sodium borohydride reduced the ester group of epoxide (1) or one cyano group of (2) selectively within 5 min to give new hydroxy- or amino-functionalized epoxides.
Ion exchange resin supported cobalt boride as highly efficient catalyst
Ion exchange resin supported cobalt boride as highly efficient catalyst for the hydrolysis of a concentrated alkaline stabilized sodium borohydride solution: A catalyst de-/reactivation study
Chemo
Mono- and gem -disubstituted epoxides were reduced to more substituted alcohols in good to high yields (73–100%) and in high regioselectivities (89–100:11–0) by sodium borohydride in a mixed solvent of t -butyl alcohol–methanol or 1,2-dimethoxyethane-methanol.
硼氢化钠_化工百科
是一种良好的还原剂，其特点是性能稳定，并且还原时有选择性。 它可用于: 用内衬聚乙烯塑料袋的铁桶包装，每桶净重50kg。 该物品属二级遇水燃烧物品，危规编号：GB 4.3类43044。 UNN0.1426; IMDG CODE 4361页，4.3类。 应贮存在阴凉、干燥的库房中，防潮，防震，不与无机酸共贮混运，远离热源和火种及易燃物品。 在使用时，不能用以水为基准的灭火器，也不能用二氧化碳及四氯化碳型灭火器，只能用于粉灭火器和干砂土灭火。 与硼氢化钠接触后有咽喉痛，咳嗽，呼吸急促，头痛，腹痛，腹泻，眩晕，眼结膜充血，疼痛等症状。 应防止粉尘飞扬，加强通风或戴防护面具，注意对眼睛的保护，戴密闭式防护眼镜，不准在工作时进食、喝水及吸烟。
Preparation of Graphene and Its Effect on Conductivity
High quality graphene and its epoxy composites were prepared by exfoliation of first stage FeCl3-GICs with sodium borohydride (NaBH4) aqueous solution, followed by compounding with epoxy resin.
Sodium borohydride
Sodium borohydride - A versatile reducing agent. / Zhenjiang, Li. 在: Synlett, 号码 1, V11004ST, 05.01.2005, 页码 182-183.
Chemical Reactions Between Epoxy Resin and Sodium Borohydride
Abstract: Epoxy resin, a high-performance thermosetting material, is widely used in electronics, automotive, construction, and aviation industries. Sodium borohydride (NaBH₄) is a novel reductant with high reactivity and selectivity. This paper introduces the chemical reactions between epoxy resin and sodium borohydride and explores their potential industrial applications.
1. Introduction Epoxy resin is a polymer formed via polycondensation of multifunctional compounds (e.g., hydroxyl and epoxy groups). It exhibits excellent mechanical properties, chemical resistance, and electrical insulation, making it versatile in numerous fields. its curing process requires high temperatures and catalysts for cross-linking. To reduce energy consumption and improve production efficiency, researchers have developed novel curing systems for epoxy resin. Sodium borohydride, as an emerging reductant, has garnered significant attention.
2. Structural Characteristics of Epoxy Resin The structure of epoxy resin primarily consists of epoxy groups (-C-O-C-), hydroxyl groups (-OH), and methyl groups (-CH₃), linked by ether bonds into a complex three-dimensional network. Its high molecular weight, cross-linking density, and thermal stability contribute to superior mechanical and electrical properties. Additionally, epoxy resin demonstrates remarkable heat resistance and corrosion resistance, maintaining performance in harsh environments.
3. Properties of Sodium Borohydride Sodium borohydride (NaBH₄) is a white crystalline solid with high reactivity and selectivity. It decomposes exothermically in water, producing hydrogen gas and sodium borate. NaBH₄ reacts with various organic and inorganic substances to form reduction products and is also used to synthesize borate salts and esters.
4. Reactions Between Epoxy Resin and Sodium Borohydride The interaction between epoxy resin and sodium borohydride is a redox reaction. At room temperature, NaBH₄ undergoes addition reactions with epoxy groups, yielding alcohols or phenols. A representative reaction is: $$2 ext{NaBH}_4 + 2 ext{C}_2 ext{H}_5 ext{OH} ightarrow 2 ext{C}_2 ext{H}_5 ext{OH} + 2 ext{NaB(OH)}_3$$ Additionally, NaBH₄ reacts with hydroxyl groups in epoxy resin through redox processes, producing alcohols or phenols, e.g.: $$2 ext{NaBH}_4 + 2 ext{C}6 ext{H}{10} ext{O}_2 ightarrow 2 ext{C}6 ext{H}{10} ext{O}_2 + 2 ext{NaB(OH)}_3$$
5. Applications of Epoxy Resin and Sodium Borohydride
- Curing Agent: NaBH₄ serves as a curing agent for epoxy resin, lowering temperature requirements during curing. This enables epoxy resin to maintain performance in low-temperature environments, expanding its applicability.
- Surface Treatment: NaBH₄ modifies epoxy resin surfaces, enhancing wear resistance and corrosion resistance. For example, incorporating NaBH₄ creates self-healing composite materials.
- Adhesive: As an adhesive, NaBH₄ improves bonding strength and durability. Epoxy resin composites with NaBH₄ exhibit exceptional adhesive properties.
The chemical reaction between epoxy resin and sodium borohydride holds significant potential for industrial applications, including curing, surface modification, and adhesive enhancement. the reaction mechanisms and influencing factors remain incompletely understood, warranting further research.
Note: Chemical formulas and reaction equations are formatted using LaTeX for clarity. Technical terms adhere to standard nomenclature in materials science and chemistry.
