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Epoxy resin toughening curing agent and preparation method thereof

A technology of epoxy resin and curing agent, applied in the field of epoxy resin curing agent, can solve the problems of poor impact resistance, poor weather resistance, affecting the bonding strength and other properties of the adhesive, short pot life, etc., and achieve long storage period. , excellent toughening effect, improve the effect of reactivity

Inactive Publication Date: 2014-04-02
QIQIHAR UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after curing, the epoxy resin has defects such as brittleness, poor impact resistance and weather resistance, which hinder its application. Therefore, scholars at home and abroad have always focused on the toughening modification of epoxy resin. The purpose of modification is to make the environment Oxygen resin to meet different needs
At present, the commonly used EP adhesives are mostly two-component, which must be mixed evenly in a certain proportion before use; if the two-component ratio is improper, it will directly affect the adhesive strength and other properties of the adhesive, and the two-component adhesive Shorter pot life after mixing

Method used

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  • Epoxy resin toughening curing agent and preparation method thereof
  • Epoxy resin toughening curing agent and preparation method thereof
  • Epoxy resin toughening curing agent and preparation method thereof

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specific Embodiment approach 1

[0011] Specific embodiment one: the preparation method of epoxy resin toughening curing agent in the present embodiment is to carry out according to the following steps: with toluene diisocyanate and dendritic polyester polyol by proportioning n NCO :n OH Mix at a ratio of 100:30 (molar ratio), then add acetone, the amount of acetone accounts for 80% of the mass of TDI, the temperature is controlled at 45°C and the reaction is stirred for 1 hour, then press n NCO :n （—NH+—OH） =1:1.1 (molar ratio) by adding imidazole, controlling the temperature at 60°C until the mass content of -NCO is less than 3% and basically unchanged, that is to obtain the toughening curing agent for epoxy resin ( figure 1 and 2 marked as P-MI-b-TDI).

[0012] Utilize following test to verify effect of the present invention:

specific Embodiment approach 2

[0026] Specific embodiment two: the preparation method of epoxy resin toughening curing agent is carried out according to the following steps in the present embodiment: with toluene diisocyanate and dendritic polyester polyol by proportioning n NCO :n OH Mix at 100:40, then add butanone, the amount of butanone accounts for 100% of the TDI mass, control the temperature at 50°C and stir for 1 hour, then press n NCO :n （—NH+—OH） =1:1.1 by adding imidazole, and controlling the temperature at 60°C until the mass content of -NCO is less than 3% and remains basically unchanged, that is, the epoxy resin toughening and curing agent is obtained.

[0027] The epoxy resin toughening and curing agent in this embodiment has a storage period of more than 180 days, an impact strength of 16.092 MPa, and a tensile shear strength of 11.012 MPa.

specific Embodiment approach 3

[0028] Specific embodiment three: the preparation method of epoxy resin toughening curing agent is carried out according to the following steps in the present embodiment: with toluene diisocyanate and dendritic polyester polyol by proportioning n NCO :n OH Mix at 100:1, then add N,N-dimethylformamide, the amount of N,N-dimethylformamide accounts for 50% of the mass of TDI, the temperature is controlled at 48°C and the reaction is stirred for 1 hour, then press n NCO :n （—NH+—OH） =1:1.1 by adding imidazole, and controlling the temperature at 60°C until the mass content of -NCO is less than 3% and remains basically unchanged, that is, the epoxy resin toughening and curing agent is obtained.

[0029] The epoxy resin toughening and curing agent in this embodiment has a storage period of more than 180 days, an impact strength of 16.102 MPa, and a tensile shear strength of 10.830 MPa.

[0030] Specific embodiment three: the preparation method of epoxy resin toughening curing agent...

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Abstract

An epoxy resin toughening curing agent and a preparation method thereof belong to the field of epoxy resin curing agent. The invention solves the technical problems that epoxy resin is brittle and that an enclosing isocyanate epoxy resin toughening curing agent has high viscosity and short storage time. The epoxy resin toughening curing agent is prepared by synthesizing a prepolymer from toluene diisocyanate and dendritic polyester polyol and conducting imidazole blocking. The method is as below: mixing toluene diisocyanate and dendritic polyester polyol, then adding a solvent, reacting under stirring at 45-50 DEG C for 1 h, then adding imidazole, reacting at temperature controlled at 60 DEG C until weight content of -NCO is less than 3% and basically unchanged. The epoxy resin toughening curing agent provided by the invention has low viscosity, long storage period more than 180 days, impact strength about 16.089 MPa, tensile shear strength of about 10.810 MPa and excellent processability, and the epoxy resin toughening curing agent is a curing agent as well as a toughening agent for epoxy resin, and has excellent toughening effect.

Description

technical field [0001] The invention belongs to the field of epoxy resin curing agent. Background technique [0002] Epoxy resin (EP) is a thermosetting plastic, which can undergo cross-linking reaction with curing agent to produce cured products with different properties. Epoxy resin adhesive has the characteristics of high bonding strength and strong versatility, and it has strong adhesion to metals, ceramics, glass steel, concrete and other materials, excellent electrical insulation, stable chemical properties and good processing performance. The excellent properties of the series have been widely used in many fields such as coatings, adhesives, electronics, civil engineering, composite materials, machinery manufacturing, electronics, and construction. However, after curing, the epoxy resin has defects such as brittleness, poor impact resistance and weather resistance, which hinder its application. Therefore, scholars at home and abroad have always focused on the toughen...

Claims

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Application Information

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IPC IPC(8): C08G59/40C08G18/76C08G18/42C08G18/83
Inventor 娄春华张霄刘喜军
Owner QIQIHAR UNIVERSITY
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