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Process for preparing modified benzoxazine

A benzoxazine and modification technology, applied in the field of preparation of benzoxazine, can solve the problems of affecting heat resistance, poor strength, poor toughness, and decreased heat resistance of the system

Inactive Publication Date: 2008-10-22
HEILONGJIANG INST OF PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the poor toughness of existing benzoxazines. Although the traditional toughening method has improved its toughness, the heat resistance of the system has decreased significantly, which has affected the performance of the material; traditional phenolic resins will release a large amount of small Molecular volatile matter, and when using strong acid as a catalyst, it will seriously affect its heat resistance and strength. A preparation method for modified benzoxazine is provided. The specific technical scheme for solving the above problems is as follows:

Method used

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  • Process for preparing modified benzoxazine
  • Process for preparing modified benzoxazine
  • Process for preparing modified benzoxazine

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Experimental program
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specific Embodiment approach 1

[0012] Specific implementation mode one: the steps of this implementation mode are as follows:

[0013] Step 1, the concentration is 37% formaldehyde aqueous solution and phenol are mixed according to molar ratio 2: 1;

[0014] Step 2, taking 5% to 15% of liquid polysulfide rubber by weight percentage and dissolving it in the solution described in step 1, stirring and dissolving until homogeneous;

[0015] Step 3, mixing aniline and phenol in a molar ratio of 1:1 with the solution in step 2;

[0016] Step 4. Put the mixed liquid in step 3 into the heating equipment and heat to 100-110°C, and react at constant temperature for 4.5-5.5 hours;

[0017] Step 5. Distilling the liquid obtained after the reaction in Step 4 under reduced pressure to obtain the modified benzoxazine of the present invention.

specific Embodiment approach 2

[0018] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in step 2, 5% of liquid polysulfide rubber is taken by weight percentage; in step 4, the heating temperature is 100° C., and the constant temperature reaction is 5.5 hours. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0019] Embodiment 3: The difference between this embodiment and Embodiment 1 is that in Step 2, 10% of the liquid polysulfide rubber is taken by weight percentage; in Step 4, the heating temperature is 105° C., and the constant temperature reaction is 5 hours. Other steps are the same as in the first embodiment.

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Abstract

The present invention relates to preparation process of benzoxazine, and is especially process of preparing modified benzoxazine. The process of preparing modified benzoxazine includes the following steps: 1. mixing water solution of formaldehyde and phenol in the molar ratio of 2 to 1; 2. dissolving polysulfide rubber liquid in the solution through stirring; 3. mixing aniline and phenol in the molar ratio of 1 to 1 into the solution; 4. heating to react ; and 5. vacuum distilling the obtained yellow liquid the reaction produces to prepare modified benzoxazine. Compared with benzoxazine, the modified benzoxazine has greatly raised toughness and strength as well as slightly raised heat performance.

Description

technical field [0001] The present invention relates to the preparation method of benzoxazine. Background technique [0002] Benzoxazine is a six-membered heterocyclic ring system composed of O atoms and N atoms. This type of compound can be ring-opened and polymerized under the action of heating or a catalyst to form a polymer with a structure similar to phenolic resin. In addition to the advantages of traditional phenolic resins, polybenzoxazine does not require a catalyst for ring-opening curing, does not emit low molecules, and has low porosity and little or no shrinkage. The existing benzoxazines have poor toughness, and although the traditional toughening method improves the toughness, the heat resistance of the system is obviously reduced, which affects the performance of the material. The pure heat curing of traditional phenolic resin will release a large amount of small molecule volatiles, and the use of strong acid as a catalyst will seriously affect its heat res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/06C07D265/12C07D265/34
Inventor 王超苏韬
Owner HEILONGJIANG INST OF PETROCHEM