Method for preparing reactive fluid rubber-epoxide resin polymer

A technology of epoxy resin and liquid rubber, applied in the field of modified epoxy resin, can solve the problems of insignificant modification effect of epoxy resin, affecting electrical properties, chemical resistance, easy precipitation, etc.

Inactive Publication Date: 2009-12-02
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the modification effect of the epoxy resin modified by this method is not obvious when the amine curing agent is used.
In the past, phthalates were used more often, but they were easy to precipitate and migrate
Moreover, the addition of small molecules will affect the electrical properties and chemical resistance of the product

Method used

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  • Method for preparing reactive fluid rubber-epoxide resin polymer
  • Method for preparing reactive fluid rubber-epoxide resin polymer
  • Method for preparing reactive fluid rubber-epoxide resin polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: the preparation of liquid rubber-epoxy resin polymer

[0015] Mix 100 parts of liquid bisphenol A epoxy resin (E-52 provided by Wuxi Resin Factory), 0-20 parts of hydroxyl-terminated polybutadiene rubber (HTPB) and 0.1-1.0 parts of catalyst N, N-dimethyl Bian amine, 100 parts of methyl endomethylene tetrahydrophthalic anhydride, added to a three-necked flask with a thermometer, heated and mechanically stirred, reacted at 100-150 ° C for 2-6 hours, degassed for 5-10 minutes, and prepared the product reaction Resistant liquid rubber-epoxy polymer.

[0016] When in use, inject the product into the mold and cure at 100-180°C for 1-1.5 hours. The mechanical properties of the cured modified epoxy resin are shown in Table 1.

[0017] Table 1 Mechanical properties

[0018]

Embodiment 2

[0020] Mix 400 parts of liquid bisphenol A type epoxy resin (E-54 provided by Wuxi Resin Factory), 0-80 parts of liquid carboxyl-terminated nitrile rubber (CTBN) and 0.2-4.0 parts of catalyst (tripropyl benzyl phosphorus) Add it into a three-necked flask with a thermometer, heat and mechanically stir, react at 100-120°C for 2-6h, precipitate with excess deionized water, wash the product, and obtain a prepolymer of CTBN modified epoxy resin after vacuum drying, and The resulting modified product is marked as C according to the CTBN content (%) 0 、C 5 、C 10 、C 15 and C 20 (The subscript is the content of CTBN), obtains the reactive liquid rubber-epoxy resin polymer with good toughness. The mechanical properties after curing are shown in Table 2. Scanning electron microscope picture as figure 1 shown.

[0021] Table 2 Mechanical properties

[0022]

[0023] figure 1 It is the SEM image of the sample section, the liquid rubber content (mass fraction) is 0%, 10%, 20% fr...

Embodiment 3

[0025] Mix 800 parts of solid bisphenol A epoxy resin (DER671 provided by Dow Chemical), 0-160 parts of carboxy-terminated nitrile rubber CTBN and 0.4-8.0 parts of catalyst (ethyltriphenylphosphine iodide fluorene) Evenly, heat and stir mechanically, and react at 120-170°C for about 2-6h. The resulting modified product is marked as C according to the CTBN content (%) 0 、C 5 、C 10 、C 15 , and C 20 (The subscript is the content of CTBN). The synthesized liquid carboxyl-terminated nitrile rubber (CTBN)-epoxy resin polymer is pulverized into powder on a pulverizer, and packed in bags for subsequent use. A series of reactive liquid rubber-epoxy polymers with good toughness were obtained. The mechanical properties after curing are shown in Table 3.

[0026] Table 3 mechanical properties

[0027]

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Abstract

The invention provides a method for preparing reactive fluid rubber-epoxide resin polymer, and belongs to the technical field of modified epoxide resin. The method comprises the following steps: 5 to 50 portions of reactive fluid rubber containing carboxyl or hydroxyl as a modifier, and 0.1 to 2.0 portions of catalyst are added into 100 to 200 portions of epoxide resin by weight; when the reactive fluid rubber containing the hydroxyl is used as the modifier, isocyanate or estolide with the same weight portion as the epoxide resin is required to be added; and an active group in the reactive fluid rubber reacts with an epoxide group in the epoxide resin for 2 to 6 hours at a temperature of between 100 and 180 DEG C to prepare the reactive fluid rubber-epoxide resin polymer with excellent toughness. The modified epoxide resin has improved toughness, non organic solvent is used in the whole synthesizing process, non environmental pollution is caused, the synthesizing process is simple and easily controlled, and the problem is not found in amplification experiments carried out for small amount, medium amount and large amount respectively, so that the method is applicable to industrial production.

Description

technical field [0001] A preparation method of reactive liquid rubber-epoxy resin polymer relates to a method for toughening and modifying epoxy resin with reactive liquid rubber. A composite epoxy resin with outstanding impact resistance and bending resistance was prepared by reacting reactive liquid rubber with epoxy resin to form a prepolymer toughened composite epoxy resin. In order to ensure that the method will not cause environmental pollution in the future industrial application, no organic solvent is used in the synthesis process, which fully meets the national "green environmental protection" requirements and expands the application field of epoxy resin. The invention belongs to the technical field of modified epoxy resin. Background technique [0002] Epoxy resins are an important class of thermosetting resins that are most widely used in polymer composites. Because of its excellent bonding performance, wear resistance, mechanical properties, electrical insulati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/14
Inventor 刘晓亚刘敬成张胜文周琼韩红军刘朋飞江金强
Owner JIANGNAN UNIV
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