Preparing method for carboxyl-terminated liquid fluorine rubber toughening modified epoxy resin system

A technology of epoxy resin system and liquid fluororubber, which is applied in the field of preparation of carboxyl-terminated liquid fluororubber toughened and modified epoxy resin system, which can solve problems such as easy cracks, limited application, and brittle cured substances, and achieve conversion rate High, simple process effect

Active Publication Date: 2016-11-23
胡瑞忠
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, epoxy resin is prone to cracks during the curing process, making the cured material brittle, poor in impact resistance and heat resistance, etc.
Thus, to a certain extent, its application in the high-tech field is limited.

Method used

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  • Preparing method for carboxyl-terminated liquid fluorine rubber toughening modified epoxy resin system
  • Preparing method for carboxyl-terminated liquid fluorine rubber toughening modified epoxy resin system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 100g of epoxy resin E51 and 5g of carboxyl-terminated liquid fluororubber (vinylidene fluoride-hexafluoropropylene copolymer) into a 500ml three-necked flask equipped with a thermometer, stirrer and nitrogen device, heat in an oil bath, and turn on the nitrogen Valve, heated to 150°C while stirring, reacted for 3h under nitrogen protection, and the product was determined by infrared analysis at 1763cm -1 The characteristic peak of the carboxyl group disappears, indicating that basically all the carboxyl groups participate in the reaction, and there is no other loss of the epoxy group, and finally a carboxyl-terminated liquid fluororubber modified epoxy resin prepolymer is obtained.

Embodiment 2

[0022] Add 100g of epoxy resin E51 and 15g of carboxyl-terminated liquid fluororubber (vinylidene fluoride-hexafluoropropylene copolymer) into a 500ml three-necked flask equipped with a thermometer, stirrer and nitrogen ventilation device, heat in an oil bath, and turn on the nitrogen gas Valve, heated to 150°C while stirring, reacted for 3h under nitrogen protection, and the product was determined by infrared analysis at 1763cm -1 The characteristic peak of the carboxyl group disappears, indicating that the carboxyl group has all participated in the reaction, and the epoxy group has no other loss, and finally a carboxyl-terminated liquid fluororubber modified epoxy resin prepolymer is obtained.

Embodiment 3

[0024] Add 100g of epoxy resin E51 and 20g of carboxyl-terminated liquid fluororubber (vinylidene fluoride-hexafluoropropylene copolymer) into a 500ml three-necked flask equipped with a thermometer, stirrer and nitrogen device, heat in an oil bath, and stir While raising the temperature to 150°C, react in a nitrogen atmosphere for 3 hours, and the others are the same as in Example 1 to obtain an epoxy resin prepolymer.

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Abstract

The invention discloses a preparing method for a carboxyl-terminated liquid fluorine rubber toughening modified epoxy resin system. The preparing method comprises the steps that carboxyl-terminated liquid fluorine rubber and epoxy resin serve as raw materials and are heated to 150 DEG C, a reaction is carried out for 2-5 h under the nitrogen protection, and a modified epoxy resin prepolymer is prepared with a one-step method. The synthesizing method is easy to implement, safe and high in yield. The invention further discloses a curing method for the carboxyl-terminated liquid fluorine rubber toughening modified epoxy resin prepolymer. According to the curing method, a proper curing agent such as hexahydrophthalic anhydride and polyether amine is selected, curing is carried out at 60-80 DEG C for 2 h, at 125 DEG C for 1.5 h and at 260 DEG C for 2 h, the toughness of a curing product is greatly improved, the maximum tensile strength reaches 31.6 MP, and the maximum elongation at break reaches 45.5%.

Description

technical field [0001] The invention relates to a preparation method of a carboxyl-terminated liquid fluorine rubber toughened and modified epoxy resin system. Background technique [0002] Epoxy resin is an important thermosetting resin with good mechanical properties, adhesive properties, electrical insulation properties, chemical stability and dimensional stability, and plays an important role in the fields of coatings, adhesives, electronics and aerospace. However, epoxy resin is prone to cracks during the curing process, making the cured substance brittle, poor in impact resistance and heat resistance, etc. Thereby limiting its application in the high-tech field to a certain extent. Therefore, epoxy resin must be toughened and modified to improve the toughness without significantly affecting the mechanical properties of the epoxy resin. [0003] The toughening methods of epoxy resins are mainly divided into three categories: (1) adding rubber elastomers, thermoplastic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/02C08L87/00C08L63/00C08G59/56C08G59/62C08G59/58C08G59/64C08G59/42
CPCC08G59/4223C08G59/56C08G59/58C08G59/623C08G59/64C08G81/024C08L87/00C08L63/00
Inventor 张孝阿刘灿灿武建华李久龙江盛玲吕亚非
Owner 胡瑞忠
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