Bio-based nano assembled curing agent for strengthening and toughening epoxy resin and preparation method of bio-based nano assembled curing agent

A technology of toughening epoxy and nano-assembly, applied in the field of bio-based curing agent for epoxy resin, can solve the problems of low strength, few reaction sites, low crosslinking density, etc., and achieve low cost, rich surface phenolic hydroxyl groups, The effect of improving overall performance

Active Publication Date: 2021-09-17
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 assembled curing agent for strengthening and toughening epoxy resin and preparation method of bio-based nano assembled curing agent
  • Bio-based nano assembled curing agent for strengthening and toughening epoxy resin and preparation method of bio-based nano assembled curing agent
  • Bio-based nano assembled curing agent for strengthening and toughening epoxy resin and preparation method of bio-based nano assembled curing agent

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 provides a bio-based nano assembled curing agent for strengthening and toughening epoxy resin and preparation method of the bio-based nano assembled curing agent . The preparation method comprises the following steps: (1) dissolving natural polyphenol powder in a solvent, carrying out ultrasonic treatment to enable the natural polyphenol powder to be subjected to a coupling reaction, carrying out stacking assembly, and carrying out ultrasonic treatment to form a microsphere-to-flat assembly with a large number of phenolic hydroxyl groups on the surface; (2) dialyzing the suspension obtained in the step (1), and freeze-drying to obtain natural polyphenol assembly powder; and (3) mixing and reacting the powder obtained in the step (2) with an epoxy resin prepolymer to obtain the product. The method is low in cost and environment-friendly, does not relate to a complicated processing technology, and can reduce the consumption of petroleum resources in the production and use process of the epoxy resin. The obtained polyphenol assembly has a remarkable nano-enhancement effect and abundant surface phenolic hydroxyl groups, a nano-enhancement network can be constructed and effective high-density interface crosslinking points can be formed by using the polyphenol assembly, and meanwhile, a non-covalent hydrogen bond network has a remarkable 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 Applications(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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