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Preparation method of cardanol-based high temperature-resistant epoxy resin curing agent

A technology of epoxy resin curing and cardanol, which is applied in the chemical field, can solve the problems of poor toughness, high curing conditions, and high toxicity, and achieve the effects of good high temperature resistance, wide curing temperature range, and low toxicity

Inactive Publication Date: 2014-04-23
上海美东生物材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of preparation method of high temperature resistant epoxy resin curing agent based on cardanol, the preparation method of described this high temperature resistant epoxy resin curing agent based on cardanol will solve the problem of high temperature resistant epoxy resin curing agent in the prior art Thermal curing agent requires high curing conditions, high toxicity, and poor toughness technical problems

Method used

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  • Preparation method of cardanol-based high temperature-resistant epoxy resin curing agent
  • Preparation method of cardanol-based high temperature-resistant epoxy resin curing agent
  • Preparation method of cardanol-based high temperature-resistant epoxy resin curing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add bisphenol A (1mol), cardanol (300g, 1mol) and paraformaldehyde (30g, 1mol) into a four-necked flask with a heating mantle, and add 3g of zinc acetate as a catalyst, and heat at 100°C for 2 hours to obtain an intermediate Body SM. Cool SM down to 65°C, add diethylenetriamine (1mol), add paraformaldehyde (30g, 1mol) in batches under stirring at this temperature, then raise the temperature to 80°C and react for 5 hours. The water discharge generated in the reaction is removed to obtain the curing agent (S1). Viscosity 30000mPa.S, amine value 290mgKOH / g, solid content 95%, surface hardness > 2H, Shore hardness > 95 degrees

[0016] Comparison of Heat Resistance

[0017]

[0018] Among them, MD650 is a cardanol phenalkamine curing agent produced by Shanghai Meidong Biomaterials Co., Ltd., which has been commercialized. It is a mid-to-high-end product with excellent performance and is the mainstream product of cardanol curing agent. It can be seen from the compariso...

Embodiment 2

[0020] Add cardanol (600g, 2mol) and paraformaldehyde (30g, 1mol) into a four-neck flask with a heating jacket, and add 3g of zinc acetate as a catalyst, and heat at 100°C for 2 hours to obtain intermediate SM. Cool the SM to 65°C, add tetraethylenepentamine (1mol), add paraformaldehyde (1mol) in batches under stirring at this temperature, then raise the temperature to 80°C and react for 5 hours, and remove the reaction under vacuum after the reaction The water produced in is discharged to obtain the curing agent (S2). Viscosity 100Pa.S, amine value 285mgKOH / g, solid content 98%, surface hardness > 2H, Shore hardness 90-95 degrees

[0021] Comparison of Heat Resistance

[0022]

[0023] Among them, MD650 is a cardanol phenalkamine curing agent produced by Shanghai Meidong Biomaterials Co., Ltd., which has been commercialized. It is a mid-to-high-end product with excellent performance and is the mainstream product of cardanol curing agent. It can be seen from the compariso...

Embodiment 3

[0025] Add phenol A (1mol), cardanol (300g, 1mol) and paraformaldehyde (30g, 1mol) into a four-necked flask with a heating mantle, and add 5g of zinc acetate as a catalyst, and heat at 100°C for 2 hours to obtain an intermediate SM. Cool the SM to 65°C, add tetraethylenepentamine (189g, 1mol), add paraformaldehyde (30g, 1mol) in batches under stirring at this temperature, then raise the temperature to 80°C and react for 5 hours, and vacuum state after the reaction The water discharge generated in the reaction is removed to obtain the curing agent (S1). Viscosity 30000mPa.S, amine value 290mgKOH / g, solid content 95%, surface hardness > 2H, Shore hardness > 95 degrees

[0026] Comparison of Heat Resistance

[0027]

[0028] Among them, MD650 is a cardanol phenalkamine curing agent produced by Shanghai Meidong Biomaterials Co., Ltd., which has been commercialized and has excellent performance. It is a mid-to-high-end product and is the mainstream product of cardanol curing a...

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Abstract

The invention relates to a preparation method of a cardanol-based high temperature-resistant epoxy resin curing agent. The preparation method comprises the steps of firstly weighing cardanol, a phenolic compound, paraformaldehyde and diamine or polyamine according to weight, adding the cardanol, the phenolic compound and the paraformaldehyde into a reaction container, adding a catalyst, heating at the temperature of 75-100 DEG C for 2-6h to obtain an intermediate, then cooling the intermediate to 60-68 DEG C, adding the diamine or the polyamine, adding the remaining paraformaldehyde at the temperature in a stirring state, then heating till the temperature achieves 65-95 DEG C, reacting for 4-8h, and dehydrating in a vacuum state to obtain the cardanol-based high temperature-resistant epoxy resin curing agent provided by the invention. The synthesized curing agent has the advantages of great surface hardness and Shore hardness, excellent gloss, good high temperature resistance and low-temperature fast curing. According to the preparation method disclosed by the invention, the epoxy resin curing agent with a wide range of curing temperature, high temperature resistance and excellent surface performance is obtained and is suitable for requirements of primer paint and finish paint.

Description

Technical field: [0001] The invention relates to the field of chemistry, in particular to polymer materials, in particular to epoxy resin curing agents, and in particular to a method for preparing a cardanol-based high-temperature-resistant epoxy resin curing agent. Background technique: [0002] Cardanol is extracted from natural cashew nut shell oil through advanced technology, and can replace or partially replace phenol for the manufacture of epoxy curing agent, liquid phenolic resin, liquid or powdered thermosetting phenolic resin. Due to its special chemical structure, cardanol also has the following characteristics: 1. It contains a benzene ring structure and has high temperature resistance; 2. The polar hydroxyl group can provide the system with wetting and activity on the contact surface; 3. The meta-position contains unsaturated The carbon 15 straight chain of the double bond can provide the system with good toughness, excellent hydrophobicity, low permeability and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/62
Inventor 黎明黎炘宋学良
Owner 上海美东生物材料股份有限公司
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