Castor oil modified benzoxazine resin and a preparation method of castor oil modified benzoxazine resin

A technology of benzoxazine and castor oil, which is applied in the field of organic polymer materials, can solve the problems of incomplete copolymerization and uneven structure, and achieve the effects of brittleness, high reactivity and excellent electrical insulation

Active Publication Date: 2018-06-01
淮北绿洲新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional polyurethane-modified benzoxazine polyurethane copolymers are generally obtained only by the reaction of phenolic hydroxyl groups...

Method used

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  • Castor oil modified benzoxazine resin and a preparation method of castor oil modified benzoxazine resin
  • Castor oil modified benzoxazine resin and a preparation method of castor oil modified benzoxazine resin

Examples

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Effect test

Embodiment 1

[0026] The invention provides a preparation method of castor oil modified polyurethane benzoxazine composite resin, the preparation steps of which are as follows:

[0027] (1) Mix 60ml of toluene and 30ml of ethanol and pour it into a 500ml four-necked flask, then add 9.3g (75mmol) p-hydroxybenzyl alcohol, 7.4g (37.5mmol) diaminodiphenylmethane, 4.5g (150mmol) formaldehyde Add it into a flask, stir and mix evenly at room temperature, then raise the temperature to 60°C, and react under reflux for 12 hours, with a stirring speed of 300r / min. After the reaction is completed, pour the solution into a beaker, add excess cold methanol to precipitate, then dry and grind to obtain a yellow powder, which is the DDM type bishydroxymethyl benzoxazine monomer.

[0028] (2) Take by weighing 2.47g (5mmol) of the prepared benzoxazine monomer in step (1) in 50ml of toluene solution, fully stir to make it dissolve, then add 0.93g (1mmol) castor oil, mix and heat up to At 110°C, 1.59g (6.35mmo...

Embodiment 2

[0031] The invention provides a preparation method of castor oil modified polyurethane benzoxazine composite resin, the preparation steps of which are as follows:

[0032] (1) Mix 60ml of toluene and 30ml of ethanol and pour it into a 500ml four-necked flask, then add 9.3g (75mmol) p-hydroxybenzyl alcohol, 7.4g (37.5mmol) diaminodiphenylmethane, 4.5g (150mmol) formaldehyde Add it into the flask, stir and mix evenly at room temperature, then raise the temperature to 80°C, and react under reflux for 4 hours with a stirring speed of 500r / min. After the reaction is completed, pour the solution into a beaker, add excess cold methanol to precipitate, then dry and grind to obtain a yellow powder, which is the DDM type bishydroxymethyl benzoxazine monomer.

[0033] (2) Weigh 2.47g (5mmol) of the benzoxazine monomer prepared in step (1) in 50ml xylene solution, fully stir to dissolve it, then add 0.93g (1mmol) castor oil, mix well and then heat up To 100°C, slowly add 1.07g (6.35mmol)...

Embodiment 3

[0036] The invention provides a preparation method of castor oil modified polyurethane benzoxazine composite resin, the preparation steps of which are as follows:

[0037] (1) Mix 60ml of toluene and 30ml of ethanol and pour it into a 500ml four-necked flask, then add 9.3g (75mmol) p-hydroxybenzyl alcohol, 7.4g (37.5mmol) diaminodiphenylmethane, 4.5g (150mmol) formaldehyde Add it into a flask, stir and mix evenly at room temperature, then raise the temperature to 70°C, and react under reflux for 10 hours, with a stirring speed of 400r / min. After the reaction is completed, pour the solution into a beaker, add excess cold methanol to precipitate, then dry and grind to obtain a yellow powder, which is the DDM type bishydroxymethyl benzoxazine monomer.

[0038] (2) Weigh 2.47g (5mmol) of the benzoxazine monomer prepared in step (1) in 50ml of dimethylformamide solution, fully stir to dissolve it, then add 0.93g (1mmol) castor oil, mix After uniformity, the temperature was raised ...

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Abstract

The invention relates to castor oil modified benzoxazine resin and a preparation method of the castor oil modified benzoxazine resin. The Castor oil modified benzoxazine resin is prepared from diisocyanate, castor oil and a bis(hydroxymethyl) benzoxazine monomer by one-step reaction, crosslinking and curing. The preparation method comprises the following steps: uniformly mixing the castor oil andthe bis(hydroxymethyl) benzoxazine monomer in a solvent, slowly dropwise adding diisocyanate to a reaction solution for reaction according to the molar ratio of cyanate groups in diisocyanate to totalhydroxyl groups in the castor oil and the bis(hydroxymethyl) benzoxazine monomer being 1:1, and performing cooling to obtain a castor oil-based polyurethane benzoxazine prepolymer; curing the obtained prepolymer solution to obtain the castor oil modified benzoxazine resin. According to the method, the modified benzoxazine resin is prepared from the introduced castor oil which is a natural renewable resource and taken as the raw material; the resin has good compatibility, flexibility and excellent dielectric properties; the synthesis process is simple.

Description

technical field [0001] The invention relates to the technical field of organic polymer materials, in particular to a castor oil-modified benzoxazine resin, a preparation method and an application thereof. Background technique [0002] Benzoxazine (BOZ) is a six-membered heterocyclic compound containing O and N elements obtained from phenols, formaldehyde, and primary amines through the Mannich reaction. It can undergo ring-opening polymerization under heating conditions to form nitrogen-containing and Cross-linked network structure similar to phenolic resin. As a new type of thermosetting resin, polybenzoxazine has the advantages of excellent electrical insulation, good heat resistance, flame retardancy, low water absorption and good mechanical properties. It is particularly noteworthy that benzoxazine resin can be heated and cured without a catalyst, no small molecules are released during the curing process, the product has low porosity, almost zero shrinkage, and has flex...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/73C08G18/67C08G18/38
CPCC08G18/3844C08G18/6705C08G18/73C08G18/7614C08G18/7671
Inventor 曾鸣庞涛谢慧徐泽寰
Owner 淮北绿洲新材料有限责任公司
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