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Bio-based nano-assembly curing agent for toughened epoxy resin and preparation method

A technology for toughening epoxy and nano-assembly, which is applied in the field of bio-based curing agents for epoxy resins. It can solve the problems of few reaction sites, low cross-linking density, and low strength, so as to enrich the surface phenolic hydroxyl groups and improve the comprehensive The effect of performance and low cost

Active Publication Date: 2022-05-17
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although these bio-based curing agents can achieve chemical cross-linking of epoxy resins, their strength is low due to fewer reaction sites and low cross-linking density. method

Method used

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  • Bio-based nano-assembly curing agent for toughened epoxy resin and preparation method
  • Bio-based nano-assembly curing agent for toughened epoxy resin and preparation method
  • Bio-based nano-assembly curing agent for toughened epoxy resin and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Dissolve 500g of commercial tannic acid powder in 2L of deionized water, and perform ultrasonic treatment at 400W, 25Hz for 30 minutes. Under the action of ultrasonic activation, tannic acid molecules undergo a coupling reaction and stack and assemble, forming a surface with a large number of phenolic hydroxyl groups. Micron-scale flat assemblies, such as image 3 shown. The resulting suspension was dialyzed against deionized water for 7 days to remove unreacted small molecules. The assembly suspension was taken out and freeze-dried to obtain tannic acid assembly powder. Mix 20 parts of the obtained powder with 100 parts of epoxy resin prepolymer (grade 1009F), stir well for more than 5 hours to uniformly disperse, heat up to 120°C for more than 5 hours, so that the epoxy resin material is fully cured, and bio-based Assembly of toughened epoxy resin materials modified with polyphenol curing agent.

Embodiment 2

[0034] Dissolve 500g of commercial tannic acid powder in 2L of deionized water, and perform ultrasonic treatment for 15 minutes under the conditions of 200W and 25Hz. The tannic acid molecules undergo a coupling reaction under the action of ultrasonic activation and stack and assemble, forming a surface with a large number of phenolic hydroxyl groups. nanoscale flat assemblies. The resulting suspension was dialyzed against deionized water for 7 days to remove unreacted small molecules. The assembly suspension was taken out and freeze-dried to obtain tannic acid assembly powder. Mix 20 parts of the obtained powder with 100 parts of epoxy resin prepolymer (grade 1009F), stir well for more than 5 hours to uniformly disperse, heat up to 120°C for more than 5 hours, so that the epoxy resin material is fully cured, and bio-based Assembly of toughened epoxy resin materials modified with polyphenol curing agent.

Embodiment 3

[0036] Dissolve 500g of commercial tannic acid powder in 2L of deionized water, and perform ultrasonic treatment for 15 minutes under the conditions of 200W and 25Hz. The tannic acid molecules undergo a coupling reaction under the action of ultrasonic activation and stack and assemble, forming a surface with a large number of phenolic hydroxyl groups. nanoscale flat assemblies, such as Figure 5 and Figure 6 shown. The resulting suspension was dialyzed against deionized water for 7 days to remove unreacted small molecules. The assembly suspension was taken out and freeze-dried to obtain tannic acid assembly powder. Mix 30 parts of the obtained powder with 100 parts of epoxy resin prepolymer (grade 1009F), stir well for more than 5 hours to uniformly disperse, heat up to 120°C for more than 5 hours, so that the epoxy resin material is fully cured, and bio-based Assembly of toughened epoxy resin materials modified with polyphenol curing agent.

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Abstract

The invention discloses a bio-based nano-assembly curing agent for strengthening and toughening epoxy resin and a preparation method. (1) Dissolve natural polyphenol powder in a solvent, carry out ultrasonic treatment to cause coupling reaction and stack and assemble , by ultrasonic treatment, to form microspherical to flat assemblies with a large number of phenolic hydroxyl groups on the surface; (2) dialyzing and freeze-drying the suspension obtained in step (1) to obtain natural polyphenol assembly powder; (3) adding step ( 2) The obtained powder is mixed and reacted with epoxy resin prepolymer to obtain a product. The invention has low cost, is environment-friendly, does not involve complicated processing technology, and can reduce the consumption of petroleum-derived resources during the production and use of the epoxy resin. The resulting polyphenolic assemblies exhibit remarkable nano-enhancing effect and abundant surface phenolic hydroxyl groups, which can construct nano-enhanced networks and form effective high-density interfacial cross-links, while their non-covalent hydrogen-bonding network has significant energy dissipation. effect.

Description

technical field [0001] The invention belongs to the field of bio-based curing agents for epoxy resins, in particular to a bio-based nano-assembly curing agent for strengthening and toughening epoxy resins and a preparation method. Background technique [0002] Epoxy resin is an important class of thermosetting resins with the widest application and the largest amount. The annual production capacity of epoxy resin in my country is more than 2 million tons, accounting for about 45% of the global production capacity. Introducing biologically derived materials into this type of widely used resin can effectively reduce the consumption of petroleum resources, which is of great significance. In addition, my country's epoxy resin industry is still in the situation of low-end overcapacity, insufficient high-end production capacity, and low overall profit margins. The development of high-performance, toughened epoxy resin materials and systems has practical significance for the devel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L63/00C08G59/62
CPCC08L63/00C08G59/621
Inventor 张新星刘纪泽王楠陈宁
Owner SICHUAN UNIV
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