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Casting epoxy resin composition for part repair

A technology of epoxy resin and composition, which is applied in the preparation of cast epoxy resin composition and the synthesis process of epoxy resin, can solve the problem of low thermal deformation temperature of cured product, affecting the overall appearance of the product, and inconsistency with production efficiency, etc. problem, to achieve the effect of fast curing speed, maintaining processability, reducing curing shrinkage and thermal stress

Inactive Publication Date: 2017-03-15
HUACHANG POLYMER EAST CHINA UNIV OFSCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For epoxy resin curing systems, we know that common aliphatic amine curing agents have high activity and fast curing at room temperature, but the cured product is brittle and prone to cracking, and the thermal deformation temperature of the cured product is low (<60°C). The high heat generated during the grinding process is likely to cause deformation and distortion of the workpiece, etc.
The resin system formula currently used, or the color is darker, which affects the overall appearance of the product; or the heat distortion temperature is low, causing distortion and deformation during polishing; or the curing time is too long, which does not meet the requirements of production efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Step 1) Preparation of resin: Preheat bisphenol A epoxy resin E-55 to 60-65°C, preheat polyurethane modified epoxy resin to 75-80°C; then preheat 100 parts of bisphenol A Type epoxy resin E-55, 30 parts of polyurethane modified epoxy resin and 20 parts of epoxy diluent polypropylene glycol diglycidyl ether were added to the reaction kettle in sequence, and the stirring was started to keep the temperature in the tank at 50-70°C. The speed is less than 100rpm, stir for 30-60min and then cool to 30-40°C; add 2 parts of defoamer, continue stirring for 20-40min, and finally carry out vacuum defoaming, defoaming while stirring for 20-40min, then stop stirring to obtain resin mixture liquid;

[0026] Step 2) Preparation of curing agent: In another reaction kettle, add 80 parts of aliphatic amine tetraethylenepentamine in parts by weight, start stirring and keep the temperature in the tank at about 25-40°C, and then add 10 parts in sequence Alicyclic amine 1,3-bis(aminomethyl)...

Embodiment 2

[0030] Step 1) Preparation of resin: Preheat bisphenol A epoxy resin E-55 to 60-65°C, preheat polyurethane modified epoxy resin to 75-80°C; then preheat 100 parts of bisphenol A Type epoxy resin E-55, 20 parts of polyurethane modified epoxy resin and 15 parts of epoxy diluent polypropylene glycol diglycidyl ether were added to the reaction kettle in sequence, and the stirring was started to keep the temperature in the tank at 50-70°C. The speed is less than 100rpm, stir for 30-60min and then cool to 30-40°C; add 1 part of defoamer, continue stirring for 20-40min, and finally carry out vacuum defoaming, defoaming while stirring for 20-40min, then stop stirring to obtain resin mixture liquid;

[0031] Step 2) Preparation of curing agent: In another reaction kettle, add 70 parts of aliphatic amine tetraethylenepentamine, start stirring and keep the temperature in the tank at about 25-40°C, then add 10 parts of alicyclic amine 1 in sequence, 3-bis(aminomethyl)cyclohexane, 10 part...

Embodiment 3

[0035] Step 1) Preheat bisphenol A type epoxy resin E-51 to 60-65°C, preheat dimer acid modified epoxy resin to 75-80°C; then preheat 100 parts of bisphenol A type Epoxy resin E-51, 15 parts of dimer acid-modified epoxy resin and 15 parts of diluent butanediol diglycidyl ether were added to the reaction kettle in sequence, and the stirring was started to keep the temperature in the tank at 50-70°C. The speed is less than 100rpm, stir for 30-60min and then cool to 30-40°C; add 0.5 parts of defoamer, continue stirring for 20-40min, and finally carry out vacuum defoaming, stirring while defoaming for 20-40min, then stop stirring to obtain resin mixture liquid;

[0036] Step 2) Preparation of curing agent: In another reaction kettle, add 60 parts of aliphatic amine triethylenetetramine and 10 parts of polyetheramine D-400, start stirring and keep the temperature in the tank at about 25-40 °C, and then sequentially Add 15 parts of the cycloaliphatic amine 1,3-bis(aminomethyl)cyclohe...

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Abstract

The invention relates to a casting epoxy resin composition for part repair, aims at achieving the technical purpose that the requirements of rapid curing at room temperature and excellent properties can be met simultaneously, and belongs to technical field of high-molecular polymers. The composition is characterized in that a preparation method of the composition comprises the steps that 1, preheated bisphenol A type epoxy resin, toughening type epoxy resin and a diluent are added into a reaction kettle in sequence, the temperature inside a stirring tank is maintained to be 50-70 DEG C, a defoamer is added, stirring and defoaming are conducted simultaneously, and a resin mixture is obtained; 2, aliphatic amine is added into another reaction kettle, stirring is started, the temperature inside a tank is maintained to be about 25-40 DEG C, alicyclic amine and an amine type accelerator are added in sequence, mixing and stirring are conducted continuously for 15-30 min, and a curing agent mixture is obtained; 3, the resin mixture and the curing agent mixture are mixed to be uniform according to the ratio of 100:(15-17), and the epoxy resin composition for part repair is obtained. The comprehensive performance of the product is excellent, and the composition has low viscosity and rapid curing speed and can meet curing requirements in different temperature environments.

Description

technical field [0001] The invention relates to a synthesis process of epoxy resin, in particular to a preparation method of a castable epoxy resin composition for part repair, and belongs to the technical field of high molecular polymers. Background technique [0002] Resin and its composite materials are more and more widely used in various fields, such as aerospace, wind turbine blades, civil engineering, sports equipment, transportation, handicrafts, etc. The surface layer of these resin or composite parts may be defective during production or may be damaged during use. If it is completely replaced, it will bring cost increase and waste of money, but if these damaged parts cannot be obtained Timely repair will not only greatly affect the normal service life of the parts, but also may cause macroscopic cracks and damage, resulting in major accidents. [0003] Repair the defects and damage of these parts as much as possible at room temperature, so as not to affect the col...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/00C08G59/50
CPCC08L63/00C08G59/502C08G59/5026C08G59/504C08L2201/08C08L2201/10C08L2205/025
Inventor 邓双辉冯云龙冼昌杰吕晓平钱建华刘坐镇
Owner HUACHANG POLYMER EAST CHINA UNIV OFSCI & TECH
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