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Method for eliminating surface crust during curing of bismaleimide resin and resin complex

A technology of resin composite and double horse resin, which is applied in the field of thermosetting resin, can solve the problems of wrinkles, large surface undulations, and increased water absorption of materials.

Active Publication Date: 2013-07-10
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, during the curing process of most allyl bisphenol-modified bis-horse resins, the free surface will quickly skin, and due to the uneven curing shrinkage, it will subsequently wrinkle and form large surface fluctuations.
However, the reason for this situation of Shuangma resin is still unclear and there are almost no reports. Combining some researches and corresponding explanations on the phenomenon of photoinduced surface protrusion, it may be due to surface oxidation polymerization and internal thermal fluctuation and shrinkage unevenness. This makes it difficult for Shuangma resin to be directly used as a surface coating layer and vacuum bag forming of composite materials and other processes
However, most of the current research on Shuangma resin focuses on the synthesis of new resins, formulations and toughening and composite materials of Shuangma resin. There are very few reports on this aspect, and a document that can be retrieved (J.Mater.Sci. 42:9170-9175) involves the doping of a quaternary ammonium salt of an amphiphilic copolymer to reduce the volume shrinkage of bima resin curing, thereby reducing surface shrinkage, but this high polymer needs to be dissolved in a solvent in advance and then When doped into Shuangma resin, the solvent needs to be removed before curing, which increases the steps and difficulty of the molding process. Doping with polymers containing a large number of ionic bonds may also increase the water absorption of the material

Method used

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  • Method for eliminating surface crust during curing of bismaleimide resin and resin complex
  • Method for eliminating surface crust during curing of bismaleimide resin and resin complex
  • Method for eliminating surface crust during curing of bismaleimide resin and resin complex

Examples

Experimental program
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Effect test

Embodiment 1

[0041] will structure as The powder of modified phenolphthalein polyarylether ketone containing active allyl groups is added to a kind of bima resin, the addition amount is 5% or 10% of the mass of bima resin, the active group of modified polyarylether ketone The ratio of the number of cluster moles to the number of repeating units is 0.18mol (ie n:(m+n)=0.09), the number average molecular weight is 35000, stirred at 110°C to dissolve, and the surface shrinkage after curing is improved. Resin compound.

[0042] This kind of resin composite prepared in this example, after being solidified according to the conventional procedure, the surface wrinkle height of the resin composite with the added amount of 10% Shuangma resin quality is reduced from the unadded ~1.3mm to 0.1mm , the height of the surface shrinkage of the resin composite with the addition of 5% Shuangma resin mass was reduced from ~1.3mm without addition to 0.3mm.

[0043] In the curing process, the surface skinni...

Embodiment 2

[0050] will structure as The powder of modified phenolphthalein polyarylether sulfone containing active allyl groups is added to Shuangma 6421 resin, the addition amount is 15% of the mass of Shuangma resin, the molar number of active groups of modified polyaryl ether ketone and The molar ratio of repeating units is 0.26 (ie n:(m+n)=0.13), the number average molecular weight is 25000, stirred at 110°C to dissolve, and the resin composite with improved surface shrinkage after curing is obtained.

[0051] The resin composite prepared in this example, after being cured according to the conventional procedures, the surface skinning and cured surface shrinkage were also obviously eliminated.

Embodiment 3

[0053] The number average molecular weight is 70000, and the structural formula is Or the number average molecular weight is 40000, and the structural formula is Or the number average molecular weight is 50000, and the structural formula is The powder of the modified phenolphthalein polyarylether phosphine oxide containing active allyl groups is added to the double horse 6421 resin, and the ratio of the molar number of active groups to the molar number of repeating units is 0.14 (ie n:(m+n) =0.07), stirred at 110°C to dissolve, and obtained a resin composite with improved surface shrinkage after curing.

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Abstract

The invention relates to a method for eliminating surface crust during curing of bismaleimide resin and a resin complex. By adding polyarylether thermoplastic resin containing allyl reaction groups into the bismaleimide resin which crusts during curing, the problem of the surface crust during curing of the bismaleimide resin can be effectively eliminated, so that the phenomenon that the cured surface is shrunk and non-uniform is eliminated, and the practical application range of the bismaleimide resin is enlarged.

Description

technical field [0001] The invention relates to a method for eliminating skinning on the surface of double-horse resin during curing and a resin compound, belonging to the technical field of thermosetting resins. Background technique [0002] Thermosetting resins have higher hardness, strength, heat resistance and solvent resistance than thermoplastic resins due to their high crosslinking density after curing, which inhibits intramolecular movement and interchain slippage. On the other hand, thermosetting resins are usually small molecule complexes before heat curing, so they have good fluidity relative to high molecular weight thermoplastic polymers at the temperature of the processing zone, and are easy to perform various moldings such as injection, brushing, and molding. way, it has been widely used in [0003] In aerospace and other fields that require materials with high heat resistance, high heat-resistant resins such as Shuangma resin and polyimide resin have receive...

Claims

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Application Information

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IPC IPC(8): C08J3/00C08L79/08C08L71/12
Inventor 郭妙才
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS