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如何配制环氧体系:多官能团环氧树脂热固化篇

更新日期: 2020-8-31  

当开发一种单组分热固性或两种组分热固化环氧体系时,我们常用到树脂体系赋予其性能。对于通常在两组分环氧体系中指定为A部分或在单组分热固化环氧体系中使用的树脂,我们可以选择:

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:

 

  • 双酚F树脂 (Bisphenol F resin)

  • 双酚A树脂 (Bisphenol A resin)

  • 酚醛清漆树脂 (Novolac resin)

  • 脂环族环氧树脂 (Cycloaliphatic epoxy resin)

  • 多官能团树脂 (Multifunctional resin)

 

在某些配方中,这些树脂可以单独使用或与其他树脂结合使用,以配制出最佳的环氧体系。

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


固化剂
Curing Agents

在选择固化剂时,为了帮助在广泛应用中获得所需性能,在配制环氧体系时可考虑以下选项:

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)

  • 聚酰胺纤维 (Polyamides)

  • 脂环族胺 (Cycloaliphatic amines)

  • 芳香胺 (Aromatic amines)

  • 酸酐类 (Anhydrides)

  • 咪唑类 (Imidazoles)

  • 路易斯酸 (Lewis acids)

 

同样地,在配制环氧体系时,这些固化剂可以在某些配方中组合使用以达到所需效果。

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


多官能团环氧树脂热固化篇
Thermal Curing of Multifunctional Epoxy Resin

多官能团环氧树脂以其高玻璃化转变温度,高分解温度,长期高温性能和良好的湿强度性能而闻名。

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用酸酐固化剂,产品的Tg较高。用胺类固化剂,失重率较小,加工温度可较低。而酸酐加叔胺体系,似有二者兼顾的效果。

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有两个与碳纤维黏结力极好的缩水甘油酯基,甚至与未经表面处理的碳纤维也能很好地粘接。通常可采用间苯二胺或液体四氢邻苯二甲酸酐(70#酸酐)为固化剂,固化后Tg较高。

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系统表现出最大的Tg。在长时间固化后,TGDDM/MHHPA体系具有最优异的耐热性能。

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.

 

鉴于三官能和四官能环氧树脂的最新发展,我们开始研究酸酐作为这些树脂的固化剂的有效性。随着我们工作的进展,揭示了使这些系统非常适合预浸料制造,长丝缠绕和拉挤成型的某些性能。

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.

 

对于多官能环氧树脂,环氧基与羟基的比率非常高,并且不容易发生反应的初始步骤。因此,只要使用低游离酸酐,就可以预期具有较长的适用期。这是酸酐固化体系的独特性能,其中高反应性多官能树脂比许多传统环氧树脂具有更长的适用期。

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.

 

使用液体酸酐的一个显着优点是它们降低胶粘剂粘度的能力。许多多官能环氧树脂是粘性液体或半固体。以大约1:1的比例使用的低粘度酸酐(60-300 cps)大大降低了树脂混合物的粘度,并在不使用溶剂或其他降粘剂的情况下促进了加工。

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.

 

多官能树脂表现出更好的高温性能,并且在较低的伸长率下更坚硬。固化收缩率明显更高。

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



南通新纳希新材料有限公司专注生产销售多官能团环氧树脂已十年有余。我们特种环氧树脂的开发为国内的新材料及军工企业的发展提供了原料的保障,为国内新材料的发展打破国外大公司的垄断做出一定的贡献。同时,这些特种环氧树脂的合成工艺都是由我们新纳希公司自主研发,因此该类项目在市场上具有很大的竞争优势。


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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