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Preparation method of low-viscosity middle/low temperature cured epoxy resin system catalyzed by nano molecular sieve-loaded anionic catalyst

A technology for curing epoxy resin and nano-molecular sieve, which is applied in the field of composite material preparation, can solve the problems of high curing temperature, high viscosity of epoxy resin, and narrow application range, and achieve good wettability, low curing temperature, and good manufacturability Effect

Inactive Publication Date: 2018-06-29
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of high viscosity, high curing temperature and narrow application range of existing epoxy resins, and to provide a method for preparing a low-viscosity, medium- and low-temperature curing epoxy resin system catalyzed by a nano-molecular sieve-loaded anion catalyst. The epoxy resin still has excellent mechanical and thermal properties

Method used

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  • Preparation method of low-viscosity middle/low temperature cured epoxy resin system catalyzed by nano molecular sieve-loaded anionic catalyst
  • Preparation method of low-viscosity middle/low temperature cured epoxy resin system catalyzed by nano molecular sieve-loaded anionic catalyst

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specific Embodiment approach 1

[0022] Specific embodiment 1: This embodiment records a preparation method of a low viscosity, medium and low temperature curing epoxy resin system catalyzed by a nano molecular sieve supported anion catalyst. The specific steps of the method are as follows:

[0023] Step 1: Preparation of aziridine / molecular sieve catalyst system:

[0024] (1) At room temperature, weigh 10-16 parts of aziridine and 15-30 parts of absolute ethanol, and mix the two to obtain a mixed solution of aziridine and ethanol;

[0025] (2) Weigh 0.5~2.5 parts of molecular sieve, put it in an oven, the temperature of the oven is 80~110℃, and the drying time is 30~45min to remove the moisture in the molecular sieve; among them, the oven is an electric heating constant temperature blast Drying box, purchased from Shanghai Yiheng Technology Co., Ltd., model DHG-9075A;

[0026] (3) Use the dipping method to immerse the mixed solution of aziridine and ethanol obtained in (1) on the molecular sieve treated in (2), and ...

specific Embodiment approach 2

[0029] Embodiment 2: The method for preparing a low-viscosity, low-viscosity, low-temperature curing epoxy resin system catalyzed by a nano-molecular sieve supported anionic catalyst described in the first embodiment. In step 1, the amount of aziridine is 10-12 parts, and the molecular sieve The number of parts is 0.5 to 1 part; in step two, the mass ratio of cycloaliphatic epoxy resin and methylhexahydrophthalic anhydride system to aziridine / molecular sieve catalyst system is 100:10.5~13.5; in step three, gradient curing The system is to cure at 20~30℃ for 3~4h, and then at 90~100℃ for 10~15h.

specific Embodiment approach 3

[0030] Specific embodiment three: a nano-molecular sieve supported anionic catalyst-catalyzed low-viscosity medium and low-temperature curing epoxy resin system preparation method described in specific embodiment one, in step one, the part of aziridine is 12-14 parts, molecular sieve The number of parts is 1~1.5 parts; in step 2, the mass ratio of cycloaliphatic epoxy resin and methylhexahydrophthalic anhydride system to aziridine / molecular sieve catalyst system is 100:13~15.5; in step 3, gradient curing The system is curing for 3~4h at 30~40℃, and then curing for 15~20h at 80~90℃.

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Abstract

The invention relates to a preparation method of a low-viscosity middle / low temperature cured epoxy resin system catalyzed by a nano molecular sieve-loaded anionic catalyst, which belongs to the fieldof preparation of a composite material by using a liquid moulding technology. The method comprises the following steps: 1) preparing a mixed solution of aziridine and ethanol; 2) taking molecular sieve and drying the molecular sieve; and 3) using an immersion method to prepare an aziridine / molecular sieve catalyst system; under room temperature condition, mixing cycloaliphatic epoxy resin, a methylhexahydrophthalic anhydride system and the aziridine / molecular sieve catalyst system; and performing gradient solidification on an obtained resin solution mixed system which is completely cured cycloaliphatic epoxy resin system. The cycloaliphatic epoxy resin system and the methylhexahydrophthalic anhydride system have low viscosity and low curing temperature, the highest curing temperature cannot exceed 100 DEG C, The anionic catalyst is used for catalyzing a crosslinking solidification reaction, the reaction is uniform, operation is simple, the process is stable, and the method is suitablefor industrial production.

Description

Technical field [0001] The invention belongs to the field of composite material preparation using a liquid molding process, and specifically relates to a method for preparing a low-viscosity, medium- and low-temperature curing epoxy resin system catalyzed by a nano molecular sieve supported by an anion catalyst. Background technique [0002] The liquid molding process is a molding process technology that is widely used in the field of composite material manufacturing. The liquid molding process requires the resin system to have a lower viscosity at room temperature and a longer storage period to ensure that the resin system can have a Good rheological properties, ensure that the resin system has sufficient infiltration of the reinforcement; in addition, the resin system should also have good curing reaction characteristics, no volatile matter or other adverse side reactions during the curing process, and the curing temperature is not appropriate Too high, curing can be achieved u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/68C08G59/42
CPCC08G59/4215C08G59/686
Inventor 张春华曹莹莹张麒张校萌
Owner HARBIN INST OF TECH
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