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如何配制環氧體系:多官能團環氧樹脂熱固化篇

更新日期: 2020-8-31  

當開發一種單組分熱固性或兩種組分熱固化環氧體系時,我們常用到樹脂體系賦予其性能。對于通常在兩組分環氧體系中指定為A部分或在單組分熱固化環氧體系中使用的樹脂,我們可以選擇:

When developing a one component heat curable, or two component heat curing epoxy system, we often use the resin system to give it properties. For the resin which is usually designated as Part A in a two component epoxy system or isused as is in a one component heat curable epoxy system, we can choose:

 

  • 雙酚F樹脂 (Bisphenol F resin)

  • 雙酚A樹脂 (Bisphenol A resin)

  • 酚醛清漆樹脂 (Novolac resin)

  • 脂環族環氧樹脂 (Cycloaliphatic epoxy resin)

  • 多官能團樹脂 (Multifunctional resin)

 

在某些配方中,這些樹脂可以單獨使用或與其他樹脂結合使用,以配制出最佳的環氧體系。

In some formulations, these resins can be used on their own or in combination with other resins to formulate the optimal epoxy system. 


固化劑
Curing Agents

在選擇固化劑時,為了幫助在廣泛應用中獲得所需性能,在配制環氧體系時可考慮以下選項:

When choosing curing agents, in order to help in attaining the desired properties in a wide range of applications, here are some of the options while formulating an epoxy system:


  • 脂肪胺 (Aliphatic amines)

  • 聚酰胺纖維 (Polyamides)

  • 脂環族胺 (Cycloaliphatic amines)

  • 芳香胺 (Aromatic amines)

  • 酸酐類 (Anhydrides)

  • 咪唑類 (Imidazoles)

  • 路易斯酸 (Lewis acids)

 

同樣地,在配制環氧體系時,這些固化劑可以在某些配方中組合使用以達到所需效果。

Similarly, when formulating an epoxy system, these curing agents can be combined in certain formulations to achieve the desired effect.


多官能團環氧樹脂熱固化篇
Thermal Curing of Multifunctional Epoxy Resin

多官能團環氧樹脂以其高玻璃化轉變溫度,高分解溫度,長期高溫性能和良好的濕強度性能而聞名。

Multifunctional epoxy resins are well known for their high glass transition temperatures, high decomposition temperatures, long term high temperature performance and good wet strength performance.

 

S-510用酸酐固化劑,產品的Tg較高。用胺類固化劑,失重率較小,加工溫度可較低。而酸酐加叔胺體系,似有二者兼顧的效果。

When S-510 is used with anhydride curing agent, the product has a higher Tg. With amine curing agent, the weight loss rate is smaller and the processing temperature can be lower. The use of anhydride plus tertiary amine system seems to have both effects.

 

S-186有兩個與碳纖維黏結力極好的縮水甘油酯基,甚至與未經表面處理的碳纖維也能很好地粘接。通??刹捎瞄g苯二胺或液體四氫鄰苯二甲酸酐(70#酸酐)為固化劑,固化后Tg較高。

S-186 has two glycidyl ester groups with excellent adhesion to carbon fibers, and can bond well even to carbon fibers without surface treatment. Generally, m-phenylene diamine or liquid tetrahydrophthalic anhydride (70# anhydride) can be used as the curing agent, and the Tg after curing is higher.

 

S-720/MHHPA系統表現出最大的Tg。在長時間固化后,TGDDM/MHHPA體系具有最優異的耐熱性能。

S-720/MHHPA system exhibits the largest Tg. After cured for a prolonged duration, the TGDDM/MHHPA system possessed the most excellent performance in heat resistance.

 

鑒于三官能和四官能環氧樹脂的最新發展,我們開始研究酸酐作為這些樹脂的固化劑的有效性。隨著我們工作的進展,揭示了使這些系統非常適合預浸料制造,長絲纏繞和拉擠成型的某些性能。

In light of the recent development of tri and tetra-functional epoxy resins, we began to investigate the effectiveness of anhydrides as curing agents for these resins. As our work progressed, certain properties that make these systems well suited for prepreg manufacture, filament winding and pultrusion were revealed.

 

對于多官能環氧樹脂,環氧基與羥基的比率非常高,并且不容易發生反應的初始步驟。因此,只要使用低游離酸酐,就可以預期具有較長的適用期。這是酸酐固化體系的獨特性能,其中高反應性多官能樹脂比許多傳統環氧樹脂具有更長的適用期。

With the polyfunctional epoxies the ratio of epoxy groups to hydroxyl groups is very high and the initial step of the reaction does not readily occur. Therefore, as long as low free acid anhydrides are used, long pot lives can be expected. This is a unique property of anhydride cured systems where in the highly reactive polyfunctional resins exhibit longer pot lives than many conventional epoxies.

 

使用液體酸酐的一個顯著優點是它們降低膠粘劑粘度的能力。許多多官能環氧樹脂是粘性液體或半固體。以大約1:1的比例使用的低粘度酸酐(60-300 cps)大大降低了樹脂混合物的粘度,并在不使用溶劑或其他降粘劑的情況下促進了加工。

A significant advantage to the use of liquid anhydrides is their ability to reduce nux viscosity.  Many of the polyfunctional epoxy resins are viscous liquids or semisolids. Low viscosity anhydrides (60-300 cps) used inratios of approximately 1:1 greatly reduced the viscosity of the resin mix and facilitate processing without the use of solvents or other viscosity reducers.

 

多官能樹脂表現出更好的高溫性能,并且在較低的伸長率下更堅硬。固化收縮率明顯更高。

The polyfunctional resins show better high temperature performance and are stiffer with lower elongation. The shrinkage on cure is significantly higher.



南通新納希新材料有限公司專注生產銷售多官能團環氧樹脂已十年有余。我們特種環氧樹脂的開發為國內的新材料及軍工企業的發展提供了原料的保障,為國內新材料的發展打破國外大公司的壟斷做出一定的貢獻。同時,這些特種環氧樹脂的合成工藝都是由我們新納希公司自主研發,因此該類項目在市場上具有很大的競爭優勢。


Nantong Synasia New Material Co., Ltd. has focused on the production and sales of multifunctional epoxy resins for more than ten years. The development of our special epoxy resin provides a guarantee of raw materials for the development of domestic new materials and military enterprises, and makes a certain contribution to the development of domestic new materials to break the monopoly of large foreign companies. At the same time, the synthesis process of these special epoxy resins is independently developed by our company, which means that this type of project has a great competitive advantage in the market.



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