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Epoxy resin foaming agent, epoxy resin composition and preparation and application thereof

A technology of epoxy resin and diepoxy compound, applied in the direction of organic chemistry, etc., can solve the problems of difficult to meet the low temperature construction, poor compatibility, high thermal conductivity, short storage period, high impact strength, high mechanical strength Effect

Active Publication Date: 2018-11-20
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there have been no relevant reports on the preparation of epoxy foam plastics with high temperature resistance by chemical foaming, and the preparation process and technology of epoxy foam plastics have not been fully studied.
[0005] EP0337443A discloses a damping epoxy resin composite material, which is synthesized by using m-xylylenediamine and linear aliphatic dibasic esters to prepare an epoxy foam with integrated functions of sound insulation, heat insulation, damping, vibration reduction and noise reduction. However, the curing temperature of the epoxy foam is >100°C, which is difficult to meet the requirements of low temperature construction
[0006] CN107250230A discloses a high-temperature-resistant foam material, which uses a reaction mixture of aromatic polyisocyanates, polyepoxides, catalysts and terminators to form a high-viscosity intermediate, and the foam material uses low-boiling fluorocarbons or fluorocarbons As a physical foaming agent, the foaming agent has poor compatibility with epoxy resin and is difficult to store stably for a long time
[0007] CN101319085 discloses a light-weight and high-strength epoxy foam preparation process, which adopts a "pre-reaction" preparation process to coordinate the foaming speed and curing speed of epoxy foam plastics, and then further "post-cure" and shape the process , to obtain lightweight and high-strength epoxy foam materials, but the decomposition temperature and curing temperature of the foaming agent used in this epoxy foam plastic are both lower than 150°C, which cannot meet the needs of high-temperature resistant environments
[0008] CN106995587A discloses a high-strength rigid flame-retardant epoxy foam material and its preparation method. The hollow filler is used to generate a cell structure, and the foam structure is controlled by controlling the quantity and size of the filler without passing through the nucleation and expansion stages of the bubble. This process can only prepare high-density foam with high thermal conductivity and poor practicability

Method used

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  • Epoxy resin foaming agent, epoxy resin composition and preparation and application thereof
  • Epoxy resin foaming agent, epoxy resin composition and preparation and application thereof
  • Epoxy resin foaming agent, epoxy resin composition and preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0056] Preparation of blowing agent

[0057] 1) Under the protection of an inert gas, mix o-phenylenediamine and 1,6-hexanediol diglycidyl ether with a molar ratio of 1:0.95 evenly, raise the temperature to 65°C, and react for 1.5h;

[0058] 2) The components in (1) and sodium nitrite are mixed evenly according to the molar ratio of 1:0.95, and the sulfuric acid aqueous solution with a concentration of 60wt% is added at the same time. The molar ratio of sulfuric acid aqueous solution and nitrous acid is 1:3, and the temperature is controlled at -10 DEG C, reaction 3.5h, obtains the epoxy blowing agent of the present invention;

[0059] Blowing Agent Structural Characterization

[0060] Such as figure 1 As shown in the FT-IR infrared spectrogram, it can be seen that after the reaction is completed, the 3500cm -1 The absorption peak of the primary amine in o-phenylenediamine disappears, while at 3450cm -1 The absorption peak of the secondary amine group is formed at 2235cm ...

Embodiment 2

[0066] Preparation of blowing agent

[0067] 1) Under the protection of an inert gas, mix m-phenylenediamine and 1,4-butanediol diglycidyl ether with a molar ratio of 1:1.05 evenly, raise the temperature to 75°C, and react for 1.5h;

[0068] 2) The components in (1) and sodium nitrite are mixed evenly according to the molar ratio of 1:1.05, while adding a sulfuric acid aqueous solution with a concentration of 80wt%, the molar ratio of the sulfuric acid aqueous solution to nitrous acid is 1:6, and the temperature is controlled at -5 DEG C, react for 4.7h, get the epoxy blowing agent of the present invention;

[0069] Blowing Agent Structural Characterization

[0070] Such as figure 2 As shown in the FT-IR infrared spectrogram, it can be seen that after the reaction is completed, the 3579cm -1 The absorption peak of the primary amine in o-phenylenediamine disappears, while at 3421cm -1 The secondary amine group absorption peak is formed at 2870cm -1 for-N ⊕ ≡ N- stretchin...

Embodiment 3

[0076] Preparation of blowing agent

[0077] 1) Under the protection of an inert gas, mix m-phenylenediamine and 1,2-cyclohexanediol diglycidyl ether with a molar ratio of 1:1, heat up to 70°C, and react for 1.8 hours;

[0078] 2) Mix the components in (1) and sodium nitrite uniformly according to the molar ratio of 1:1, and simultaneously add a hydrochloric acid aqueous solution with a concentration of 10wt%, the molar ratio of the hydrochloric acid aqueous solution to nitrous acid is 1:5, and the temperature is controlled at 5 DEG C, react 4h, obtain epoxy blowing agent of the present invention;

[0079] Blowing Agent Structural Characterization

[0080] Such as image 3 As shown in the FT-IR infrared spectrogram, it can be seen that after the reaction is completed, the 3271cm -1 The absorption peak of the primary amine in o-phenylenediamine disappears, while at 2954cm -1 The absorption peak of the secondary amine group is formed at 1725cm -1 for-N ⊕ ≡ N- stretching sh...

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Abstract

The invention discloses application of a compound of a structural formula (I) as shown in the description as an epoxy resin foaming agent, and an epoxy resin composition and a preparation method and application thereof. The foaming agent comprises preparation raw materials of aromatic di-primary amine, sodium nitrite and a double-epoxy compound. The foaming agent is used after the epoxy resin composition and is decomposed under the action of UV (Ultraviolet) radiation to generate nitrogen, and in addition, a foaming velocity can be controlled by adjusting the strength of UV, so that requirements of low-temperature construction can be met; the foaming agent is high in compatibility with the epoxy resin can stably exist in the epoxy resin, and the problems that a physical foaming agent is short in preservation time in a system and a chemical foaming agent can be decomposed to generate gases at a high temperature can be solved; foams prepared from the foaming agent are high in mechanicalstrength, and the epoxy resin composition is applicable to pipeline heat preservation with high thermal resistance requirements.

Description

technical field [0001] The invention belongs to the field of epoxy resins, and in particular relates to an epoxy resin foaming agent, an epoxy foaming material composition and a preparation method and application thereof. Background technique [0002] Epoxy structural foam is a low-density foam with low water absorption and shrinkage after curing, as well as good heat resistance and chemical stability, so epoxy structural foam is usually used in automotive, aerospace and industrial In the field of facilities, epoxy foam has mature manufacturing technology abroad. [0003] At present, the foam materials commonly used in industrial steam pipelines mainly include polyurethane foam and epoxy foam. Polyurethane foam has the characteristics of light weight, good heat insulation effect, high specific weight, and chemical corrosion resistance. The shortcomings of poor thermal stability, low weather resistance and aging resistance, the service life is only 3 to 5 years. Epoxy foam ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D301/00C07D303/22C08L63/00C08J9/10
CPCC07D301/00C07D303/22C08J9/10C08J2203/04C08J2363/00
Inventor 周萌刘赵兴吴鹏超姜庆梅
Owner WANHUA CHEM GRP CO LTD
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