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Preparation method of liquid-crystal allyl-compound-modified bismaleimide resin

A technology of bismaleimide resin and allyl compound, applied in the field of preparation of bismaleimide resin, to achieve the effect of increasing flexural strength and flexural modulus, and increasing heat resistance

Active Publication Date: 2015-10-14
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Literature (Nie Wangyan, Li Yang, Xu Hongyao et al. Preparation and properties of liquid crystals with bifunctional groups of 4,4'bis(4-allyloxybenzoic acid)phenyl ester[J]. Functional Materials, 2009,40(2): 342-344.) publicly reported the synthesis method of 1,4'-di(4-allyloxybenzoic acid) phenyl ester, but this document is only aimed at the synthesis of a liquid crystal monomer with bifunctional groups, and there is no follow-up report , and 1,4'-bis(4-allyloxybenzoic acid)phenyl was not used in the modification research of bismaleimide resin

Method used

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  • Preparation method of liquid-crystal allyl-compound-modified bismaleimide resin
  • Preparation method of liquid-crystal allyl-compound-modified bismaleimide resin
  • Preparation method of liquid-crystal allyl-compound-modified bismaleimide resin

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Experimental program
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Effect test

Embodiment 1

[0017] Heat and melt 2.06g of 1,4'-di(4-allyloxybenzoic acid)phenyl ester at 165°C, add 13.26g of 2,2'-diallyl bisphenol A to melt, then add 19.68g of N ,N'-4.4'-diphenylmethane bismaleimide monomer is melt-copolymerized at 140°C until the system becomes a homogeneous reddish-brown transparent liquid, and then reacted with heat preservation to obtain a modified bismaleimide resin. Put the obtained resin in a vacuum oven at 140°C for defoaming treatment for 50 minutes, and then pour it into a mold preheated to 140°C and coated with a release agent for curing. The curing process is 180°C / 1h+210 ℃ / 2h+250℃ / 6h. After curing, the bismaleimide cured resin modified by the liquid crystal allyl compound is obtained.

[0018] control group

[0019] The components are N,N'-1.4'-diphenylmethane bismaleimide and 2,2'-diallyl bisphenol A;

[0020] After heating and melting 14.98g of 2,2'-diallyl bisphenol A at 70°C, add 20.01g of N,N'-4.4'-diphenylmethane bismaleimide monomer at 140°C for...

Embodiment 2

[0022] Heat and melt 4.05g of 1,4'-di(4-allyloxybenzoic acid)phenyl ester at 165°C, add 11.59g of 2,2'-diallyl bisphenol A to melt, then add 19.36g of N ,N'-4.4'-diphenylmethane bismaleimide monomer is melt-copolymerized at 140°C until the system becomes a homogeneous reddish-brown transparent liquid, and then reacted with heat preservation to obtain a modified bismaleimide resin. Put the obtained prepolymer into a vacuum drying oven at 140°C for defoaming treatment for 50 minutes, and then pour it into a mold preheated to 140°C and coated with a release agent for curing. The curing process is 180°C / 1h +210°C / 2h+250°C / 6h. After curing, the bismaleimide cured resin modified by the liquid crystal allyl compound is obtained.

Embodiment 3

[0024] Heat and melt 5.97g of 1,4'-di(4-allyloxybenzoic acid)phenyl ester at 165°C, add 9.98g of 2,2'-diallyl bisphenol A to melt, then add 19.05g of N ,N'-4.4'-diphenylmethane bismaleimide monomer is melt-copolymerized at 150°C until the system becomes a homogeneous reddish-brown transparent liquid, and then the modified bismaleimide resin is obtained by heat preservation reaction. Put the obtained prepolymer into a vacuum drying oven at 150°C for defoaming treatment for 50 minutes, and then pour it into a mold preheated to 150°C and coated with a release agent for curing. The curing process is 180°C / 1h +210°C / 2h+250°C / 6h. After curing, the bismaleimide cured resin modified by the liquid crystal allyl compound is obtained.

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Abstract

The invention relates to a liquid-crystal allyl-compound-modified bismaleimide resin and a preparation method thereof. The liquid-crystal allyl-compound-modified bismaleimide resin comprises a phenyl 1,4-di(4-allyloxybenzoate) liquid-crystal allyl compound, 2,2'-diallyl bisphenol A, a bismaleimide monomer and the like. The preparation method comprises the following steps: melting the phenyl 1,4-di(4-allyloxybenzoate) liquid-crystal allyl compound by heating; adding the 2,2'-diallyl bisphenol A, and uniformly mixing; controlling the temperature at 130-160 DEG C, adding the bismaleimide monomer while stirring to perform prepolymerization until the system becomes a uniform transparent red brown liquid; and cooling to room temperature to obtain the red brown transparent solid resin. The modified bismaleimide resin is soluble in acetone, chloroform and other conventional low-boiling solvents, and has favorable curability. The cured product has excellent heat resistance and toughness. Thus, the modified bismaleimide resin is a matrix resin of advanced polymer-base composite materials required by the fields of aerospace, electronics and electricity.

Description

technical field [0001] The invention belongs to the field of organic high-performance polymer materials, and in particular relates to a preparation method of bismaleimide resin modified by a liquid crystal allyl compound. Background technique [0002] Bismaleimide resin is a new type of resin developed in the middle of the 20th century. It has both the heat resistance of polyimide resin and the excellent processing performance of epoxy resin. It is a high-strength and high-modulus material. It is used as an advanced polymer-based composite material, but the cross-linking density of Shuangma resin is high, and the toughness of the product is poor, so that its impact resistance and stress cracking resistance are also greatly reduced. In order to improve its shortcomings, many researchers at home and abroad have devoted themselves to the toughening of bismaleimide resin. [0003] At present, commonly used bismaleimide resin modification methods include allyl compound modificat...

Claims

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Application Information

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IPC IPC(8): C08G73/12
Inventor 陈平王开翔熊需海王园英于祺
Owner DALIAN UNIV OF TECH
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