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A kind of bismaleimide polymer and preparation method thereof

A technology of bismaleimide and polymer, which is applied in the field of bismaleimide polymer and its preparation, can solve the problems of high process cost, troublesome processing methods, and easy crosslinking of highly branched polymers. Achieve the effect of promoting application, reducing pressure and saving cost

Active Publication Date: 2021-03-02
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above two patents have effectively solved the problem of easy crosslinking of hyperbranched polymers during the preparation process by adjusting the amount and method of BTA added, but the final compositions are all mixed solutions, and neither mentions how to efficiently The composition can be separated from the mixed solution, and the further polymerization of the composition components during the separation and drying process can be avoided; this brings difficulties to the industrial production and application of hyperbranched polymers
[0008] In 2015, the applicant disclosed in the patent CN105461927A a preparation method of bismaleimide that can be stored for a long time, which can accelerate the reaction rate of bismaleimide radical polymerization under the action of an oily initiator , after the reaction is completed, the bismaleimide polymer is precipitated by introducing a phase separation solvent; this method can effectively prolong the storage period of the maleimide polymer, but it needs to introduce a large amount of phase separation solvent, and the follow-up treatment method is cumbersome and the process High cost, not conducive to scale-up production

Method used

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  • A kind of bismaleimide polymer and preparation method thereof
  • A kind of bismaleimide polymer and preparation method thereof
  • A kind of bismaleimide polymer and preparation method thereof

Examples

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Effect test

Embodiment 1

[0039] The present embodiment provides a kind of bismaleimide polymer and preparation thereof:

[0040] Put 20g of N,N'-(methylenediphenyl)bismaleimide into a 250mL three-necked flask, add 20g of γ-butyrolactone solvent and 60g of toluene, heat to 80°C, fully stir and disperse for 30min, wait After the temperature is stabilized, add 3.572g of barbituric acid powder at one time, keep stirring at 80°C for 4 hours, cool to room temperature, and separate the upper layer solvent and precipitate by wall tilting method; the obtained precipitate is washed with methanol and dried at 80°C Instantly.

Embodiment 2

[0042] The present embodiment provides a kind of bismaleimide polymer and preparation thereof:

[0043] Put 20g of N,N'-(methylenediphenyl)bismaleimide into a 250mL three-necked flask, add 60g of γ-butyrolactone solvent and 20g of toluene, heat to 80°C, fully stir and disperse for 30min, wait After the temperature is stabilized, add 3.572g of barbituric acid powder at one time, keep stirring at 80°C for 4 hours, cool to room temperature, and separate the upper layer solvent and precipitate by wall tilting method; the obtained precipitate is washed with methanol and dried at 80°C Instantly.

Embodiment 3

[0045] The present embodiment provides a kind of bismaleimide polymer and preparation thereof:

[0046] Put 20g of N,N'-(methylenediphenyl)bismaleimide into a 250mL three-necked flask, add 60g of γ-butyrolactone solvent and 20g of toluene, heat to 100°C, fully stir and disperse for 30min, wait After the temperature is stabilized, add 3.572g of barbituric acid powder at one time, keep stirring at 100°C for 4 hours, cool to room temperature, and separate the upper layer solvent and precipitate by wall tilting method; the obtained precipitate is washed with methanol and dried at 80°C Instantly.

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Abstract

The invention relates to the field of polymers, in particular to a bismaleimide polymer and a preparation method thereof. The preparation method uses bismaleimide monomer and barbituric acid or its derivatives as raw materials to carry out polymerization reaction in a mixed solvent of good solvent and poor solvent to obtain bismaleimide polymer The mass ratio of described good solvent and poor solvent is (0.01-100):1. The process provided by the invention not only has a simple method, but also reduces the pressure of solvent recovery, saves costs, and is beneficial to popularization and application. Moreover, through the combined optimization of the used solvent and condition parameters, the molecular weight of the prepared polymer can be effectively controlled to ensure that the Mw range of the prepared bismaleimide polymer is 10,000-1,000,000.

Description

technical field [0001] The invention relates to the field of polymers, in particular to a bismaleimide polymer and a preparation method thereof. Background technique [0002] The branched structure of hyperbranched polymers results in loose accumulation of molecular chains and larger free volume, which reduces the entanglement between molecular chains, so its solubility is higher than that of linear polymers of similar molecular weight. [0003] Hyperbranched polymers are usually AB x Form monomers (where x is 2 or greater), one-step polymerization into high molecular weight polymers with a degree of branching (DB) greater than 0.5. Formula 1 is AB 2 Schematic diagram of the structure of hyperbranched polymers synthesized from type monomers. In Formula 1, A and B are reactive functional groups, and ab is a chain segment produced by the condensation reaction of A and B. [0004] The structure of hyperbranched polymers contains a large number of terminal functional groups,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/12
CPCC08G73/128
Inventor 张海燕周鼎李翔王建涛庞静
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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