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Powdered epoxy resin toughener and preparation method thereof

A technology of powder epoxy resin and epoxy resin, which is applied in the field of toughening agent, can solve the problems of less research on toughening, and achieve the effect of cheap raw materials, easy control, and easy industrialization

Inactive Publication Date: 2010-06-16
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few studies on the toughening of powder epoxy resins used in powder coatings.

Method used

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  • Powdered epoxy resin toughener and preparation method thereof
  • Powdered epoxy resin toughener and preparation method thereof
  • Powdered epoxy resin toughener and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 72 mL (0.5 mol) of n-butyl acrylate (nBA), 6.82 mL (0.05 mol) of glycidyl methacrylate (GMA), 120 mL of solvent (N, N-dimethylformamide), initiator (azobis Isobutyronitrile) 0.35g adds and installs agitator, reflux condenser and N 2 In the 500mL four-neck bottle of the gas protection device, nBA and GMA were added according to the ratio of the experimental design (nBA / GMA molar ratio 10 / 1). React at a temperature of about 70°C for 5-6 hours.

[0021] The product was precipitated with deionized water, washed, dissolved, precipitated, and washed again, and finally dried in a vacuum oven (40° C.) for 24 hours to obtain pure polymer P(nBA-GMA).

[0022] The structure of the product was characterized with an infrared spectrometer, and the results are shown in figure 1 , 1730cm on the spectrum -1 Nearby is the absorption peak of carbonyl, 1149cm -1 It is the asymmetric absorption peak of C-O-C in the ester group. The characteristic absorption peak of the epoxy functional...

Embodiment 2

[0024] The solid epoxy resin and the synthesized toughening agent are physically blended by heating and melting according to different proportioning systems (the mass ratio of toughening agent to epoxy resin is 0 / 100-25 / 100), and a phenolic curing agent is added (the mass ratio is 20% of the epoxy resin), extruded and cooled on an extruder, and finally pulverized to obtain a blending system of a toughening agent, an epoxy resin and a curing agent.

[0025] The obtained blend system powder is pressed on a hot press, and finally processed into test strips for mechanical property testing. figure 2 is the impact performance curve of epoxy resin modified with different proportions of toughener, figure 2 It shows that the addition of toughening agent can improve the impact toughness of epoxy resin, and the impact strength increases with the increase of toughening agent. When the mass ratio of toughening agent to epoxy resin is 5 / 100, the toughness of the spline increases signific...

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Abstract

The invention discloses a powdered epoxy resin toughener and a preparation method thereof, which belong to the technical field of tougheners. The method takes n-butyl acrylate and glycidyl methacrylate as raw materials to prepare an active toughener in solution through a copolymerization reaction. The toughener is blended, cross-linked and cured with a powdered epoxy resin and then can form a cross-linking network with the epoxy resin. A structure of the toughener contains a flexible segment and an active epoxy group, so the toughener has excellent toughening effect on the powdered epoxy resin. When the mass ratio of a polymer to the epoxy resin is 5 to 100, the measured impact resistance is improved to 209.2 percent of a pure epoxy resin. The synthesis of the toughener is only a one-step reaction without side reactions, and has high product yield. The method has the advantages of cheap raw materials, simple reaction, mild conditions, easy control, and convenient industrialization.

Description

technical field [0001] A powder epoxy resin toughening agent and a preparation method thereof relate to a toughening agent with active epoxy groups and flexible chain segments and a synthesis method thereof, belonging to the technical field of toughening agents. Background technique [0002] While epoxy resin has many excellent properties, it has the disadvantage of poor toughness. In recent years, there have been many studies on the toughening of general-purpose epoxy resins. However, there are few studies on the toughening of powder epoxy resins used in powder coatings. There are several ways to study the toughening of general-purpose epoxy resins: ① adding inorganic nanomaterials (such as montmorillonite) to the epoxy resin system for toughening; ② adding rubber elastomers (such as nitrile butadiene) to the epoxy resin system rubber), thermoplastic resin, liquid crystal polymer or core-shell polymer, etc.; ③ interpenetrating network or semi-interpenetrating network meth...

Claims

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Application Information

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IPC IPC(8): C08L63/00C08L33/08C08F220/18C08F220/32C08F2/06
Inventor 倪才华李西顺
Owner JIANGNAN UNIV
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