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Epoxy resin roughening and curing agent

A technology of epoxy resin and curing agent, which is applied in the field of epoxy resin toughening and curing agent, can solve problems such as the research on the toughening performance of epoxy resin, and achieve the goal of improving the scope of use and application value, low cost, and increasing impact strength Effect

Inactive Publication Date: 2007-09-12
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

W.X.Zukas (W.X.Zukas, P.M.Wilson, J.J.Gassner.Polym.Mater.Sci.Eng, 1997, 77:232~233) of the United States was the first to try to introduce PAMAM into the epoxy resin system as a curing agent. He passed TBA and DSC studied the curing behavior of PAMAM and epoxy resin with different generations, and found that the amine groups on the surface of PAMAM can react well with epoxy resin, but the author did not conduct a study on the toughening performance of PAMAM on epoxy resin. Research

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Take 15g of m-phenylenediamine and 15g of 4,4'-diaminodiphenylmethane (mass ratio 1:1), heat them into liquid state at 140℃ and mix them together, stir well, and then mix them evenly The liquid is placed in a desiccator at room temperature, after the mixture is cooled to 40 ℃, with 25g triethylenetetramine, 45g fourth-generation polyamide-amine dendrimer (with ethylenediamine as the core, the outermost 32 Amino functional groups) and 600g EPON828 mixed. The curing temperature is 80℃, and the gel is about 35min. Measure the mechanical properties of epoxy resins and compare the mechanical properties of EPON82 epoxy resins using equivalent amounts of meta-phenylenediamine, fourth-generation polyamide-amine dendrimer (PAMAM) and triethylenetetramine alone. . The four curing agents were cured at 80°C for 8 hours, and then post-cured at 120°C for 3 hours. The results are shown in Table 1.

[0019] Hardener

Embodiment 2

[0021] Take 188 m-xylene diamine and 30 g diethylene triamine, 72 g of the first generation polyamide-amine dendrimer (with ammonia as the core and 3 amine functional groups at the outer end) and 700 g of E-44 type double The phenol A epoxy resin is mixed. It can be cured at room temperature, and the gel time is 1.5 hours. The mechanical properties of the epoxy resin are measured. And compare the mechanical properties of E-44 epoxy resin using equivalent diaminodiphenylmethane, the first generation polyamide-amine dendrimer (PAMAM) and diethylenetriamine alone. The four cured products were cured at room temperature for 72 hours, and then post-cured at 120°C for 3 hours. The results are shown in Table 2.

[0022] Hardener

Embodiment 3

[0024] Take 18g m-aminobenzylamine and 27g 4,4'-diaminodiphenylmethane (that is, the mass ratio 4:6), heat them into liquid state at 100°C and mix them together, stir well, and mix with 6g Siya Ethyl pentamine, 4g diethylene triamine, 45g sixth-generation polyamide-amine dendrimer (with ethylenediamine as the core, 128 amine functional groups at the outer end) and 650 grams of E-51 type double The phenol A epoxy resin is mixed. The system was cured at 100°C, the gel time was 16 minutes, and the mechanical properties of the epoxy resin were measured. The mechanical properties of E-51 epoxy resins using equivalent amounts of diaminodiphenylmethane, sixth-generation polyamide-amine dendrimer (PAMAM) and diethylenetriamine were compared. The four cured products were cured at 100°C for 6 hours, and then post-cured at 120°C for 3 hours. The results are shown in Table 3.

[0025] Hardener

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PUM

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Abstract

The epoxy resin roughening and curing agent consists of tree-shaped polyamide-amine polymer 10-60 wt%, saturated fatty polybasic amine 10-70 wt% and aromatic polybasic amine 10-45 wt% and is prepared through mixing tree-shaped polyamide-amine polymer, saturated fatty polybasic amine and aromatic polybasic amine. The preparation process has low cost. Compared with epoxy resin with saturated fatty polybasic amine and aromatic polybasic amine, the epoxy resin with the said epoxy resin roughening and curing agent has 180 % raised impact toughness, and other important performances maintained. In addition, the epoxy resin roughening and curing agent has wide curing temperature range from room temperature to 120 deg.c and adjustable curing period, and thus makes epoxy resin possess widened application range and raised application value.

Description

Technical field [0001] The invention relates to a curing agent, in particular to an epoxy resin toughening curing agent. Background technique [0002] Epoxy resin is a thermosetting resin with excellent adhesion, abrasion resistance, mechanical properties, electrical insulation properties, chemical stability, high and low temperature resistance, and is used in adhesives, electronic instruments, light industry, construction, machinery, aerospace It is widely used in aviation, coatings, bonding and other fields. However, after curing, the epoxy resin has a high crosslinking density and a three-dimensional network structure. It has high internal stress, brittleness, poor fatigue resistance, heat resistance, and impact resistance, as well as low peel strength, cracking strain, and moisture resistance. Shortcomings such as poor, to a large extent limit its application in certain high-tech fields. Therefore, the toughening and strengthening of epoxy resins has always been one of the im...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G59/40C08L77/00C08K5/18
Inventor 陈海生王焱吴国飞王先胜
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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