TW202116890A - Composition and application of epoxy resin for prepreg - Google Patents
Composition and application of epoxy resin for prepreg Download PDFInfo
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本發明係關於一種環氧樹脂膠液，及關於上述環氧樹脂膠液搭配纖維組成為預浸材之應用。The present invention relates to an epoxy resin glue solution and the application of the above-mentioned epoxy resin glue solution with fiber composition as a prepreg material.
環氧樹脂為一種熱固性聚合物，其固化後的黏結性、耐熱性、耐化學藥品及優異的力學性能和電器性能，廣泛用於黏著劑、塗料、電子器件、體育用品、汽車及航太工業等複合材料。環氧樹脂的另一個重要應用為與纖維形成纖維強化複合材料，廣泛應用於製造大型模具例如飛機、太空梭、輪船及小船、衝浪板、滑雪板及風力機之轉子葉片的材料。Epoxy resin is a kind of thermosetting polymer, its adhesiveness, heat resistance, chemical resistance and excellent mechanical properties and electrical properties after curing. It is widely used in adhesives, coatings, electronic devices, sporting goods, automobiles and aerospace industries. And other composite materials. Another important application of epoxy resin is to form fiber-reinforced composite materials with fibers, which are widely used in the manufacture of large molds such as aircraft, space shuttles, ships and boats, surfboards, snowboards, and wind turbine rotor blades.
目前作為環氧樹脂預浸材，為之詬病的是環氧樹脂本身無法同時滿足高剛性及高韌性的要求，使其應用性受限。對此，技術領域中需要一種同時滿足兩要求的環氧樹脂，在環氧樹脂具高Tg的同時，其韌性表現依然優異。此外，在室溫下，環氧樹脂預浸材保有優異的儲存性，而製成的成品也具有良好的機械強度。At present, as an epoxy resin prepreg, it is criticized that the epoxy resin itself cannot meet the requirements of high rigidity and high toughness at the same time, which limits its applicability. In this regard, there is a need in the technical field for an epoxy resin that meets both requirements at the same time. While the epoxy resin has a high Tg, its toughness performance is still excellent. In addition, at room temperature, epoxy resin prepreg maintains excellent storage properties, and the finished product also has good mechanical strength.
本發明一方面在於提供一種預浸材，包含： 一樹脂組合物，其中該樹脂組合物包含環氧樹脂、硬化劑及脲類促進劑， 其中該環氧樹脂包含兩種或兩種以上環氧樹脂， 其中該硬化劑選自雙氰胺類硬化劑及咪唑類硬化劑的組合。One aspect of the present invention is to provide a prepreg, including: A resin composition, wherein the resin composition includes an epoxy resin, a hardener and a urea accelerator, The epoxy resin contains two or more epoxy resins, The hardener is selected from the combination of dicyandiamide hardeners and imidazole hardeners.
前述樹脂組合物一種單液型的環氧樹脂膠液。The aforementioned resin composition is a single-component epoxy resin glue.
前述預浸材，其中該環氧樹脂係選自以下之群：雙酚A型環氧樹脂、雙酚F型環氧樹脂、雙酚S型環氧樹脂、酚醛環氧樹脂、三官能團環氧樹脂、四官能團環氧樹脂。The aforementioned prepreg, wherein the epoxy resin is selected from the following group: bisphenol A epoxy resin, bisphenol F epoxy resin, bisphenol S epoxy resin, novolac epoxy resin, trifunctional epoxy Resin, tetrafunctional epoxy resin.
前述預浸材，其中該環氧樹脂至少包含一酚醛環氧樹脂。In the aforementioned prepreg, the epoxy resin includes at least one novolac epoxy resin.
前述預浸材，其中該雙氰胺類硬化劑係選自雙氰胺及其衍生物。In the aforementioned prepreg, the dicyandiamide hardener is selected from dicyandiamide and its derivatives.
前述預浸材，其中該咪唑類硬化劑係選自2-甲基咪唑、2-十一烷基咪唑、1-氰基乙基-2-十一烷基咪唑、2-十七烷基咪唑、2-乙基-4-甲基咪唑、1-氰基乙基-2-乙基-4-咪唑、2-苯基咪唑、2-苯基-4-甲基咪唑及其上述之組合。The aforementioned prepreg, wherein the imidazole hardener is selected from 2-methylimidazole, 2-undecylimidazole, 1-cyanoethyl-2-undecylimidazole, 2-heptadecylimidazole , 2-Ethyl-4-methylimidazole, 1-cyanoethyl-2-ethyl-4-imidazole, 2-phenylimidazole, 2-phenyl-4-methylimidazole, and combinations thereof.
前述預浸材，其中該脲類促進劑係選自N-對氯代苯基N’，N’-二甲基脲、3-苯基-1,1-二甲基脲以及3-對硝基苯基-1,1-二甲基脲及其上述之組合。The aforementioned prepreg, wherein the urea accelerator is selected from N-p-chlorophenyl N',N'-dimethylurea, 3-phenyl-1,1-dimethylurea and 3-p-nitrophenyl Phenyl-1,1-dimethylurea and combinations of the above.
前述預浸材，其中該樹脂組合物進一步包含酸基型增韌劑。In the aforementioned prepreg, the resin composition further comprises an acid-based toughening agent.
前述預浸材，其中該樹脂組合物進一步包含添加劑，其中該添加劑系包含: 流平劑、消泡劑、分散助劑、偶合劑、流變助劑、催化劑、螢光劑、丙烯酸酯類單體及其組合。The aforementioned prepreg, wherein the resin composition further includes an additive, wherein the additive includes: a leveling agent, a defoamer, a dispersing aid, a coupling agent, a rheology aid, a catalyst, a fluorescent agent, an acrylic monomer Body and its combination.
前述預浸材，其中以該組合物之總重量計，該環氧樹脂的用量為約55重量%至約90重量%；該硬化劑的用量為約1重量%至約30重量%；該脲類促進劑的用量為約1重量%至約15重量%。In the aforementioned prepreg, based on the total weight of the composition, the epoxy resin is used in an amount of about 55% to about 90% by weight; the hardener is used in an amount of about 1% to about 30% by weight; the urea The amount of such accelerators is about 1% to about 15% by weight.
本發明一方面在於提供一種環氧樹脂複合纖維材料，其係由前述預浸材，由樹脂組合物與(增強)纖維含浸後，經後固化處理而得。One aspect of the present invention is to provide an epoxy resin composite fiber material, which is obtained from the aforementioned prepreg, impregnated with a resin composition and (reinforcing) fibers, and then subjected to post-curing treatment.
本發明之環氧樹脂預浸材其膠液與纖維有良好的含浸性，製成預浸材後在低溫下具有良好的儲存性。此外，環氧樹脂具有高Tg點，代表其剛性強，又同時保有複合材料的韌性，使得預浸材的應用性更為廣泛，相較於先前技術更可滿足業界的需求。在機械性能上，經過適當的後固化條件處理，環氧樹脂複合材料可得到大於100 MPa的彎曲強度及大於60 MPa的短樑強度，顯示該複合材料具有極佳的力學性能。The epoxy resin prepreg of the present invention has good impregnation properties for glue and fibers, and has good storage properties at low temperatures after being made into prepregs. In addition, epoxy resin has a high Tg point, which represents its strong rigidity while maintaining the toughness of composite materials. This makes the prepreg material more versatile and can meet the needs of the industry more than the prior art. In terms of mechanical properties, after proper post-curing conditions, the epoxy resin composite material can obtain a bending strength greater than 100 MPa and a short beam strength greater than 60 MPa, showing that the composite material has excellent mechanical properties.
為便於理解本文所陳述之揭示內容，茲於下文中術語「約」意謂如由一般熟習此項技術者所測定之特定值的可接受誤差，其部分地視如何量測或測定該值而定。In order to facilitate the understanding of the disclosure stated herein, the term "about" hereinafter means the acceptable error of a specific value as determined by a person familiar with the art, and it depends in part on how the value is measured or measured. set.
本發明一方面在於提供一種環氧樹脂膠液，包含環氧樹脂、硬化劑、促進劑及添加劑。其中該環氧樹脂包含兩種或兩種以上環氧樹脂。硬化劑包含兩種或兩種以上胺類化合物。硬化劑與促進劑以固體形式分散在環氧樹脂體系中。 本發明之環氧樹脂預浸材 1. 環氧樹脂 One aspect of the present invention is to provide an epoxy resin glue containing epoxy resin, hardener, accelerator and additives. The epoxy resin contains two or more epoxy resins. The hardener contains two or more amine compounds. The hardener and accelerator are dispersed in the epoxy resin system in solid form. Epoxy resin prepreg of the present invention 1. Epoxy resin
本發明使用之環氧樹脂包含兩種或兩種以上環氧樹脂，可為任何本發明所屬技術領域具有通常知識者所已知者，其可選種類例如但不限於：雙酚A型環氧樹脂、雙酚F型環氧樹脂、雙酚S型環氧樹脂、酚醛環氧樹脂、三官能團環氧樹脂、四官能團環氧樹脂。較佳之可選種類為雙酚A型環氧樹脂、雙酚F型環氧樹脂、雙酚S型環氧樹脂及酚醛環氧樹脂。在本發明之一實施態樣中，環氧樹脂至少包含一酚醛環氧樹脂。在本發明之一實施態樣中，環氧樹脂至少包含一雙酚A型環氧樹脂與一酚醛環氧樹脂。本發明之環氧樹脂可與硬化劑反應。在本發明之一實施態樣中，以該組合物總重量計，環氧樹脂之總含量係介於約50重量%至約90重量%之間，較佳介於約55重量%至約80重量%之間，更佳介於約60重量%至約70重量%之間。 2. 硬化劑 The epoxy resin used in the present invention contains two or more epoxy resins, which can be known by any person with ordinary knowledge in the technical field to which the present invention belongs. The optional types are, for example, but not limited to: bisphenol A epoxy Resin, bisphenol F type epoxy resin, bisphenol S type epoxy resin, novolac epoxy resin, trifunctional epoxy resin, tetrafunctional epoxy resin. The preferred optional types are bisphenol A epoxy resin, bisphenol F epoxy resin, bisphenol S epoxy resin, and novolac epoxy resin. In an embodiment of the present invention, the epoxy resin includes at least one novolac epoxy resin. In an embodiment of the present invention, the epoxy resin includes at least a bisphenol A epoxy resin and a novolac epoxy resin. The epoxy resin of the present invention can react with a hardener. In an embodiment of the present invention, based on the total weight of the composition, the total content of the epoxy resin is between about 50% by weight to about 90% by weight, preferably between about 55% by weight and about 80% by weight. %, more preferably between about 60% by weight and about 70% by weight. 2. Hardener
本發明所用的硬化劑在常溫下為固體，以微粒狀的形式與環氧樹脂體系共混而不反應，一旦加熱溫度至其熔點附近時，才會與環氧樹脂參與固化反應，此類型的硬化劑稱之為潛伏型硬化劑。此外，潛伏型硬化劑的使用需考量兩點:第一，在樹脂體系中需分散完全，以得到較高的交聯密度及較佳的力學性能；第二，潛伏型硬化劑的顆粒大小亦須考量，過大的顆粒對於其與環氧樹脂的交聯程度有限，過小的顆粒則可能易發生凝聚現象而導致分散不完全，改善的方法可藉由添加抗凝結劑來解決。然抗凝結劑添加量過多，可能會導致固化樹脂的機械性能下降，故使用時須審慎評估。The hardener used in the present invention is solid at room temperature, and is blended with the epoxy resin system in the form of particles without reaction. Once the heating temperature reaches near its melting point, it will participate in the curing reaction with the epoxy resin. This type of Hardeners are called latent hardeners. In addition, the use of latent hardeners needs to consider two points: first, it needs to be completely dispersed in the resin system to obtain higher crosslinking density and better mechanical properties; second, the particle size of the latent hardener is also It must be taken into consideration that too large particles have a limited degree of cross-linking with epoxy resin, while particles that are too small may be prone to agglomeration and lead to incomplete dispersion. The improvement method can be solved by adding an anti-coagulant. However, excessive addition of anticoagulant may cause the mechanical properties of the cured resin to decrease, so careful evaluation must be made when using it.
本發明所用之硬化劑選自雙氰胺類硬化劑及咪唑類硬化劑的組合，且可為本發明所屬技術領域中具有通常知識者所熟知者，進一步添加其他潛伏型硬化劑，其例如但不限於：有機酸醯胺三氟化硼胺絡合物，二胺基馬來腈及其衍生物等。使用時可選用其中一種或者兩種以上混合之。The hardener used in the present invention is selected from a combination of dicyandiamide hardeners and imidazole hardeners, and can be those well known to those with ordinary knowledge in the technical field to which the present invention pertains, and other latent hardeners are further added, such as but Not limited to: organic acid amide boron trifluoride amine complex, diamino maleonitrile and its derivatives, etc. One of them or a mixture of two or more can be selected when used.
本發明所用之雙氰胺類硬化劑選自及咪唑類硬化劑。The dicyandiamide hardener used in the present invention is selected from imidazole hardeners.
本發明所用之咪唑類硬化劑選自2-甲基咪唑、2-十一烷基咪唑、1-氰基乙基-2-十一烷基咪唑、2-十七烷基咪唑、2-乙基-4-甲基咪唑、1-氰基乙基-2-乙基-4-咪唑、2-苯基咪唑、2-苯基-4-甲基咪唑及其上述之組合。The imidazole hardener used in the present invention is selected from 2-methylimidazole, 2-undecylimidazole, 1-cyanoethyl-2-undecylimidazole, 2-heptadecylimidazole, 2-ethyl 4-methylimidazole, 1-cyanoethyl-2-ethyl-4-imidazole, 2-phenylimidazole, 2-phenyl-4-methylimidazole, and combinations thereof.
本發明之硬化劑可與環氧樹脂混合加熱至熔點附近時進一步與環氧樹脂交聯固化。在本發明之一實施態樣中，以該組合物總重量計，硬化劑之總含量係介於約1重量%至約30重量%之間，較佳介於約3重量%至約25重量%之間，更佳介於約5重量%至約15重量%之間。 3. 促進劑 The hardener of the present invention can be mixed with epoxy resin and heated to near the melting point to further cross-link with epoxy resin to cure. In an embodiment of the present invention, based on the total weight of the composition, the total content of the hardener is between about 1% by weight to about 30% by weight, preferably between about 3% by weight and about 25% by weight. Between about 5% and about 15% by weight is more preferable. 3. Accelerator
在使用環氧樹脂與硬化劑的組成物時，總是希望有較長的適用期，既便於組成物的存放，也便於操作進行。但往往操作時，希望能有較快的固化時間，使得工藝過程能夠縮短，如此一來需要在環氧樹脂及硬化劑中添加促進劑，以使反應能夠加速進行。When using the composition of epoxy resin and hardener, it is always desirable to have a longer pot life, which is convenient for the storage of the composition and the operation. However, it is often desirable to have a faster curing time during operation, so that the process can be shortened, so it is necessary to add accelerators to the epoxy resin and hardener to accelerate the reaction.
本發明之促進劑可為有機脲類或其衍生物。The accelerator of the present invention may be organic urea or its derivatives.
本發明之合適的脲類促進劑選自N-對氯代苯基N’，N’-二甲基脲、3-苯基-1,1-二甲基脲以及3-對硝基苯基-1,1-二甲基脲及其上述之組合，例如UR500、FXE-1030、ICAM-8403、ICAM-8406，上述促進劑之亦可與進一步與咪唑類或其衍生物例如二甲基咪唑、二苯基咪唑、二乙基四甲基咪唑，改性胺類、醇類、或酸類等物質，可以是一種或是幾種以上的組合做為促進劑組合物使用。上述促進劑之含量亦為本發明所屬技術領域中具有通常知識者可經由例行實驗調整者。The suitable urea accelerator of the present invention is selected from N-p-chlorophenyl N', N'-dimethylurea, 3-phenyl-1,1-dimethylurea and 3-p-nitrophenyl -1,1-Dimethylurea and combinations of the above, such as UR500, FXE-1030, ICAM-8403, ICAM-8406, the above accelerators can also be further combined with imidazoles or their derivatives such as dimethylimidazole , Diphenylimidazole, diethyltetramethylimidazole, modified amines, alcohols, or acids, etc., can be one or a combination of more than several as the accelerator composition. The content of the above-mentioned accelerator can also be adjusted by a person with ordinary knowledge in the technical field of the present invention through routine experimentation.
本發明所選用之促進劑，在本發明之一實施態樣中，以該組合物總重量計，促進劑之總含量係介於約1重量%至約15重量%之間，較佳介於約1.5重量%至約13重量%之間，更佳介於約2重量%至約10重量%之間。 4. 增韌劑 The accelerator selected for use in the present invention, in one embodiment of the present invention, based on the total weight of the composition, the total content of accelerator is between about 1% by weight to about 15% by weight, preferably between about Between 1.5% by weight and about 13% by weight, more preferably between about 2% by weight and about 10% by weight. 4. Toughener
本發明之環氧樹脂組合物可進一步包含增韌劑。適用於本發明的增韌劑優選為酸基型增韌劑，例如端羧基丁腈橡膠（CTBN）。本發明所選用之增韌劑，在本發明之一實施態樣中，以該組合物總重量計，增韌劑之總含量係介於約1重量%至約20重量%之間，較佳介於約2重量%至約15重量%之間，更佳介於約3重量%至約10重量%之間。 5. 添加劑 The epoxy resin composition of the present invention may further include a toughening agent. The toughening agent suitable for the present invention is preferably an acid-based toughening agent, such as carboxy-terminated nitrile rubber (CTBN). For the toughening agent selected in the present invention, in one embodiment of the present invention, based on the total weight of the composition, the total content of the toughening agent is between about 1% by weight and about 20% by weight, preferably between about 1% by weight and about 20% by weight. It is between about 2% by weight and about 15% by weight, more preferably between about 3% by weight and about 10% by weight. 5. Additives
本發明之環氧樹脂組合物可視需要含有本發明所屬技術領域中具有通常知識者習知之任何適當添加劑，例如(但不以此為限)：流平劑、消泡劑、分散助劑、偶合劑、流變助劑、催化劑、螢光劑、丙烯酸酯類單體及其組合等。上述添加劑之含量亦為本發明所屬技術領域中具有通常知識者可經由例行實驗調整者。 6. 增強纖維 The epoxy resin composition of the present invention may optionally contain any appropriate additives known to those with ordinary knowledge in the technical field of the present invention, such as (but not limited to): leveling agent, defoaming agent, dispersing aid, and Mixtures, rheology additives, catalysts, fluorescent agents, acrylate monomers and their combinations, etc. The content of the above-mentioned additives can also be adjusted by a person with ordinary knowledge in the technical field of the present invention through routine experiments. 6. Reinforcing fiber
本發明所用之增強纖維並無特殊限制，且可為本發明所屬技術領域中具有通常知識者所熟知者，較佳為纖維布，期可選擇種類但不限於：玻璃纖維、碳纖維、硼纖維、芳綸纖維、碳化矽纖維、石棉纖維、單晶晶鬚、金屬絲和硬質細粒。根據本發明之一些實施例，本發明所用之增強纖維為玻璃纖維布、碳纖維布或其混合物。 本發明環氧樹脂預浸材之應用 The reinforcing fiber used in the present invention is not particularly limited, and may be well-known to those with ordinary knowledge in the technical field to which the present invention belongs. It is preferably fiber cloth. It is expected that the types of reinforcing fibers can be selected but not limited to: glass fiber, carbon fiber, boron fiber, Aramid fiber, silicon carbide fiber, asbestos fiber, single crystal whisker, metal wire and hard fine particles. According to some embodiments of the present invention, the reinforcing fiber used in the present invention is glass fiber cloth, carbon fiber cloth or a mixture thereof. Application of epoxy resin prepreg of the present invention
本發明另一方面在於提供一種環氧樹脂預浸材。預浸材可以是預浸布、浸單片材或預浸多片材。Another aspect of the present invention is to provide an epoxy resin prepreg. The prepreg material can be a prepreg cloth, a single impregnated sheet or a prepreg multi-sheet material.
上述的環氧樹脂膠液對於纖維的含浸性佳，因此，本發明之環氧樹脂複合材料可進一步包含纖維，可獲得包含纖維與環氧樹脂的纖維強化環氧樹脂複合材料。適用於本發明的纖維並無特殊限制，可為玻璃纖維、碳纖維、石墨纖維、有機纖維、硼纖維、鋼纖維等。The above-mentioned epoxy resin glue has good impregnation properties for fibers. Therefore, the epoxy resin composite material of the present invention can further include fibers, and a fiber-reinforced epoxy resin composite material containing fibers and epoxy resin can be obtained. The fiber suitable for the present invention is not particularly limited, and can be glass fiber, carbon fiber, graphite fiber, organic fiber, boron fiber, steel fiber, and the like.
本發明的環氧樹脂複合材料可由本發明之環氧樹脂膠液與纖維含浸製成預浸材後，經適當的後固化條件而得。對此，這裡的後固化條件，溫度需接近硬化劑之熔點，才能使硬化劑處於熔融狀態而與環氧樹脂交聯固化。於機械性能測試，環氧樹脂複合材料的彎曲強度大於100 MPa，而短樑強度可達到60 MPa，由此顯示該複合材料具有極佳的力學性能，對於在汽車部件或運動器材等領域應用更為廣泛。 實施例 The epoxy resin composite material of the present invention can be obtained by impregnating the epoxy resin glue solution and fibers of the present invention into a prepreg, and then subjecting it to appropriate post-curing conditions. In this regard, the post-curing conditions here require that the temperature be close to the melting point of the hardener so that the hardener can be in a molten state and cross-linked and solidified with the epoxy resin. In the mechanical performance test, the bending strength of epoxy resin composite material is greater than 100 MPa, and the short beam strength can reach 60 MPa, which shows that the composite material has excellent mechanical properties and is more suitable for applications in automotive parts or sports equipment. For extensive. Example
預浸布的生產方式，使用垂直塗佈機(卡文公司所生產的GS-110150 )生產預浸布，首先將增強纖維布置於一層離型膜(成朔企業所生產的EKTER-018-50 孔洞大小0.1 mm2 )上方，放置好之後，待增強纖維與樹脂含浸後，再蓋上一層離型膜(成朔企業所生產的EKTER-018-50)，並通過垂直烘烤機烘烤。烘烤條件為100-150℃下烘烤5-20分鐘以去除溶劑，烘烤後使用卷軸將含浸完的預浸布收卷。本發明之預浸布於乾燥前之固含量範圍介於65~95%之間，而乾燥後之固含量大於99%。The production method of prepreg is to use a vertical coating machine (GS-110150 produced by Karvin Company) to produce prepreg. First, the reinforcing fibers are arranged on a layer of release film (EKTER-018-50 produced by Chengshuo Enterprise). The hole size is 0.1 mm 2 ). After placing it, after the reinforcing fiber is impregnated with the resin, cover it with a release film (EKTER-018-50 produced by Chengshuo Enterprise) and bake it through a vertical baking machine. The baking conditions are 100-150°C for 5-20 minutes to remove the solvent. After baking, the impregnated prepreg is rolled up using a reel. The solid content of the prepreg of the present invention before drying ranges from 65 to 95%, and the solid content after drying is greater than 99%.
表一為環氧樹脂組合物及測試結果，樹脂組合物包含環氧樹脂、酚醛樹脂、硬化劑、促進劑、增韌劑及溶劑。各組份所選用試劑與生產公司如表二所示。Table 1 shows the epoxy resin composition and test results. The resin composition includes epoxy resin, phenolic resin, hardener, accelerator, toughening agent and solvent. The reagents and production companies selected for each component are shown in Table 2.
樹脂彎曲強度測試方法：測定本發明之樹脂的彎曲強度時，用該樹脂在加熱條件為150℃下4小時使樹脂固化。彎曲強度係根據ASTM D790條件實施，推薦的試片大小為長x寬x厚=80±0.5毫米x 12.5±0.5毫米x 3.0±0.125毫米。Resin bending strength test method: When measuring the bending strength of the resin of the present invention, the resin is used to cure the resin under the heating condition of 150°C for 4 hours. The bending strength is implemented in accordance with ASTM D790 conditions. The recommended size of the test piece is length x width x thickness = 80 ± 0.5 mm x 12.5 ± 0.5 mm x 3.0 ± 0.125 mm.
複材短樑強度測試方法：測定本發明之複材的短樑強度時，用該樹脂在加熱條件為兩階段升溫，升溫範圍為90-150℃，並施以適當的壓力使複材固化完成。短樑強度係根據ASTM D 2344條件實施，推薦的試片大小為長是厚度的6倍及寬是厚度的2倍。Composite short beam strength test method: when measuring the short beam strength of the composite material of the present invention, the resin is used to raise the temperature in two stages under the heating conditions, and the temperature rise range is 90-150℃, and appropriate pressure is applied to complete the curing of the composite material. . The strength of the short beam is implemented in accordance with ASTM D 2344. The recommended size of the test piece is 6 times the thickness and 2 times the thickness.
本發明實施例1-3與比較例1-5的測試結果可知：在缺乏硬化劑1(如比較例2)或硬化劑2(如比較例1)時，樹脂及複材的強度均偏低。本發明之環氧樹脂組合物，在具有兩種硬化劑並搭配促進劑及增韌劑時，具有較大且符合規格的樹脂彎曲強度及複材短樑強度(樹脂彎曲強度規範須大於100 MPa，複材短樑強度規範須大於60 MPa)。
表一：環氧樹脂組合物及測試結果
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