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High-toughness liquid molding resin based on phase state control technology, composite material and preparation method thereof

A liquid molding and composite material technology, applied in the field of composite materials, can solve the problems of short storage period, increased viscosity of resin system, affecting production and application, etc., to achieve the effect of improving toughness and good compatibility

Pending Publication Date: 2022-01-21
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After using conventional thermoplastic tougheners (such as PES, PEI, etc.), the viscosity of the resin system increases sharply, which cannot meet the needs of the liquid molding process
Toughening with liquid rubber (e.g. CTBN) leads to lower glass transition temperature of the composite
Some liquid molding resins use a curing agent with a long molecular chain (such as polyether ammonia), but the curing agent has high activity and a short storage period, which affects actual production and application.

Method used

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  • High-toughness liquid molding resin based on phase state control technology, composite material and preparation method thereof
  • High-toughness liquid molding resin based on phase state control technology, composite material and preparation method thereof
  • High-toughness liquid molding resin based on phase state control technology, composite material and preparation method thereof

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preparation example Construction

[0031] According to a third aspect of the present invention, a method for preparing a high-toughness composite material based on phase control technology is provided, comprising the following steps:

[0032] Step (1), weigh the components of the following mass percentages:

[0033] The liquid thermosetting resin is 60-75%, the curing agent is 20-30%, and the toughening agent is the balance, preferably 2-6%.

[0034]Step (2), mixing the weighed liquid thermosetting resin with the toughening agent, heating and dissolving at 100-140° C. to obtain a transparent liquid resin mixture;

[0035] Step (3), adding a weighed curing agent into the transparent liquid resin mixture, heating and dissolving at 120-150°C to obtain a transparent or translucent liquid molding resin;

[0036] Step (4), heating the liquid molding resin obtained in step (3) to the minimum viscosity temperature of the resin between 100-160°C, when the viscosity reaches the lowest value ≤ 500cP, vacuumize to elimina...

Embodiment 1

[0043] Step (1), weigh each component as required;

[0044]

[0045]

[0046] Among them, the solid toughening agent E21 belongs to the triblock copolymer of styrene-butadiene-methyl methacrylate.

[0047] Step (2), mix the liquid thermosetting resin and the solid toughening agent E21 at room temperature, heat up while stirring, and dissolve at 130±5°C, stir for 120 minutes until the solid toughening agent E21 is completely dissolved, and obtain Liquid resin transparent mixture.

[0048] In step (3), the curing agent DDM is added to the transparent liquid resin mixture obtained in step (2), stirred and dissolved at 130±5° C. to obtain a liquid molding resin.

[0049] In step (4), the liquid molding resin obtained in step (3) is heated to the minimum viscosity temperature of the resin (120° C.), and vacuumized to eliminate air bubbles in the resin. The above-mentioned liquid molding resin was heated up to 180°C, and cured for 2 hours to obtain a resin cast body, which w...

Embodiment 2

[0054] Step (1) weigh each component as required;

[0055]

[0056]

[0057] Among them, the solid toughening agent M65N is methyl methacrylate-butyl acrylate-methyl methacrylate triblock copolymer.

[0058] Step (2) Mix the liquid thermosetting resin with the solid toughening agent M65N at room temperature, and heat up while stirring, and dissolve at 130±5°C, and stir for 120 minutes until the solid toughening agent M65N is completely dissolved to obtain a liquid Resin transparent mixture.

[0059] Step (3) adding the curing agent DDS into the transparent liquid resin mixture obtained in step (2), stirring and dissolving at 130±5° C. to obtain a liquid molding resin.

[0060] Step (4) Heat the liquid molding resin obtained in step (3) to the minimum viscosity temperature of the resin (120°C), and then vacuumize to eliminate the air bubbles in the resin. The above-mentioned liquid molding resin was heated up to 180°C, and cured for 2 hours to obtain a resin cast body, ...

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Abstract

The invention provides high-toughness liquid molding resin based on a phase state control technology, a composite material and a preparation method thereof. The liquid molding resin comprises 60-75% of liquid thermosetting resin, 20-30% of a curing agent and the balance of a toughening agent. A reinforcing phase of the composite material is fiber fabric, and a resin phase is liquid molding resin. According to the preparation method of the composite material, a phase state control technology is utilized, the adopted flexibilizer can generate phase change along with temperature change and resin curing, along with temperature rise, the flexibilizer can be dissolved in matrix resin to form a uniform and stable mixture, the uniform and stable mixture is uniformly distributed in the matrix resin, and in the liquid forming process, the toughening agent cannot be filtered out by the fiber and can permeate to the periphery of the fiber along with the matrix resin, along with further increase of the temperature, the matrix resin and the curing agent are subjected to a cross-linking reaction, the compatibility of the toughening agent and the matrix resin is reduced, the toughening agent and the matrix resin are subjected to phase separation, and the toughening agent and the matrix resin are uniformly distributed in the composite material, so that the toughness of the composite material is improved.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a high-toughness liquid molding resin based on phase state control technology, a composite material and a preparation method thereof. Background technique [0002] High-performance resin-based composite materials have been more and more widely used in the aviation field, and have become an indispensable airframe structure material for the new generation of aircraft. However, with the continuous expansion of the amount, the weaknesses of traditional composite materials, such as low damage tolerance and high manufacturing cost, have also begun to be exposed, which limits the further expansion of the amount of composite materials to a certain extent. Liquid molding technology is recognized as a low-cost manufacturing technology for composite materials. Its biggest feature is the high dimensional accuracy of the molded parts and the good stability of product b...

Claims

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Application Information

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IPC IPC(8): C08L63/00C08L53/02C08L53/00C08K7/06C08J5/04
CPCC08J5/042C08J2363/00C08J2463/00C08J2453/02C08J2453/00C08K7/06
Inventor 栾贻浩左小彪易凯杨智勇孙建波
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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