Halogen-free flame retardant epoxy resin system, prepreg and preparing methods thereof

An epoxy resin system and epoxy resin technology, applied in the field of composite materials, can solve the problems of poor mechanical properties of composite materials, affect the compactness of composite materials, and cannot be used as load-bearing structures, and achieve improved strength and modulus, good toughness, The effect of improving interlaminar shear performance

Pending Publication Date: 2019-05-24
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, phenolic resin has a regular molecular structure and poor toughness. The curing reaction is a polycondensation reaction. Small molecules are released during the curing process, which affects the compactness of the composite material. Therefore, the composite material has poor mechanical properties and cannot be used as a load-bearing structure.

Method used

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  • Halogen-free flame retardant epoxy resin system, prepreg and preparing methods thereof
  • Halogen-free flame retardant epoxy resin system, prepreg and preparing methods thereof
  • Halogen-free flame retardant epoxy resin system, prepreg and preparing methods thereof

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preparation example Construction

[0041] The embodiment of the present invention also provides a preparation method of a halogen-free flame-retardant epoxy resin system, including:

[0042] (1) Weigh the following components in mass percentage:

[0043] 30-70% of liquid epoxy resin, 5-30% of solid resin, 12-32% of solid halogen-free flame retardant, and 2-8% of epoxy curing agent; the raw materials used in this example are all provided by the above resin system examples, For specific descriptions and effects, refer to the foregoing embodiments, and details are not repeated here.

[0044] (2) mixing the liquid epoxy resin and solid resin to obtain a liquid resin mixture;

[0045] (3) adding the weighed solid halogen-free flame retardant into the liquid resin mixture for reaction, and obtaining a liquid mixed system after the reaction;

[0046] (4) Add the weighed epoxy curing agent into the cooled liquid mixing system and mix to obtain a halogen-free flame-retardant epoxy resin system.

[0047]In an optional...

Embodiment 1

[0069] Weigh raw materials:

[0070]

[0071] Step (1) Raw material pretreatment: baking novolac epoxy resin at 90° C., pulverizing the solid resin to obtain solid resin particles with an equivalent particle diameter of 5 mm or less.

[0072] Step (2) Put the liquid epoxy resin E51 and the baked novolac epoxy resin F46 into a reaction kettle with a temperature control device, add solid resin particles, and stir for 20 minutes at 75°C to obtain a liquid resin mixture .

[0073] Step (3) Add the powdered halogen-free flame retardant to the liquid resin mixture obtained in step (2), heat to a temperature of 80°C, stir and mix, stir for 60 minutes, heat up to 130°C, continue stirring for 120 minutes to obtain a liquid mixture system.

[0074] Step (4) Cool the liquid mixed system obtained in step (3) to 70°C under stirring, add a latent epoxy curing agent, and stir at 70°C for 20 minutes at high speed to obtain a halogen-free flame-retardant epoxy resin system.

[0075] Step...

Embodiment 2

[0081] In the halogen-free flame retardant epoxy resin system: the matrix component containing the following mass percentage content

[0082]

[0083] Step (1) Raw material pretreatment: Baking and melting the novolac epoxy resin F48 at 80° C., crushing the massive solid resin to obtain solid resin particles with an equivalent particle diameter of 3 mm or less.

[0084] Step (2) Put the liquid epoxy resin 680S and the baked novolac epoxy resin F48 into a reaction kettle with a temperature control device, add the solid epoxy resin, and stir for 20 minutes at 80°C to obtain a liquid resin mixture.

[0085] Step (3) Add the powdered halogen-free flame retardant to the liquid resin mixture obtained in step (2), stir and mix, heat up to 70°C, stir for 60 minutes, raise the temperature to 130°C, continue stirring and mixing for 120 minutes, and obtain a liquid mixed system.

[0086] Step (4) Cool the liquid mixed system obtained in step (3) to 60° C. under stirring, add a curin...

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Abstract

The invention provides a halogen-free flame retardant epoxy resin system, prepreg and preparing methods thereof. The resin system is prepared from, by mass, 30-70% of liquid epoxy resin, 5-30% of solid resin, 12-32% of a solid halogen-free flame retardant and 2-8% of an epoxy curing agent, wherein the solid resin is at least one of phosphorus-containing epoxy resin, phenolic resin or benzoxazine resin, and the solid halogen-free flame retardant is at least one of organic-reaction-type phosphorus-series, silicon-series or nitrogen-series flame retardants which do not contain halogen. The resinsystem has high flame retardance and smoke suppression effects, and the highest-level flame retardance requirement in DIN5510, EN45545 and other standard requirements is met; meanwhile, the system hasstrong interlayer shearing force, and can be used as a load-carrying structure material.

Description

technical field [0001] The invention relates to a halogen-free flame-retardant epoxy resin system, a prepreg and a preparation method thereof, belonging to the technical field of composite materials. Background technique [0002] Rail transit occupies a pivotal position in the transportation industry. The demand for rail transit trains worldwide is increasing year by year. At the same time, higher requirements are put forward for the carrying capacity, comfort performance, environmental protection and safety performance of the car body. Composite materials have light weight , high strength, the use of composite materials can effectively solve the problem of train weight reduction, composite materials have good damping performance, so it can also play a role in shock absorption and noise reduction. [0003] As an important means of transportation, the train puts forward higher requirements on the flame retardancy of materials. At present, composite materials mainly based on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/00C08L61/34C08K7/06C08K7/14C08J5/24
Inventor 周宇栾贻浩金鑫付平俊蒋文革
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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