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Curing agent capable of reducing volatile matter of adhesive

The technology of curing agent and volatile content is applied in the field of preparation of adhesives with high tensile shear strength and low volatile content. The viscosity, the reaction steps are simple and easy to operate, and the effect of low molecular weight

Active Publication Date: 2021-11-30
上海零号源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a curing agent that reduces the volatile content of the adhesive for the problems of low tensile and shear strength and high volatile content of the adhesive.

Method used

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  • Curing agent capable of reducing volatile matter of adhesive
  • Curing agent capable of reducing volatile matter of adhesive
  • Curing agent capable of reducing volatile matter of adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] S1: Add 30.83g of methylenebisacrylamide, 100ml of N,N-dimethylformamide and 100ml of water into the reaction flask, and stir evenly at room temperature. Bubble nitrogen for 20 minutes, then slowly add 25.84 g of 1-(2-aminoethyl)piperazine dropwise into the above mixed system, raise the temperature to 60° C. and react for 5 days. After the reaction, cool, purify, and vacuum dry at 30°C for 48 hours to obtain hyperbranched polyamidoamine, attached figure 1 Its infrared spectrum; attached figure 2 Its H NMR spectrum; attached image 3 Its carbon nuclear magnetic spectrum; attached Figure 4 for its mass spectrum.

[0050] S2: Add 3.0g of paraformaldehyde, 10.3g of diethylenetriamine, and 0.2g of hyperbranched polyamidoamine to the reaction flask in sequence, raise the temperature to 105°C and stir for 1 hour, then titrate 30.0g of cardanol, drop it in about 30 minutes, and keep the temperature constant After the reaction lasted for 1 hour, it was cooled to remove wat...

Embodiment 2

[0053] S1: Add 24.67g of methylenebisacrylamide, 100ml of N,N-dimethylformamide and 105ml of water into the reaction flask, and stir well at room temperature. Bubble nitrogen for 30 minutes, then slowly drop 25.84 g of 1-(2-aminoethyl)piperazine into the above mixed system, and raise the temperature to 58° C. for 6 days. After the reaction, cool, purify, and vacuum dry at 35° C. for 48 hours to obtain hyperbranched polyamidoamine.

[0054] S2: Add 5.0g of paraformaldehyde, 8g of triethylenetetramine, and 0.4g of hyperbranched polyamidoamine in sequence in the reaction bottle, raise the temperature to 100°C and stir for 1 hour, then titrate 25.0g of cardanol, drop it in about 30 minutes, and continue at constant temperature The reaction was completed after 1 hour, cooled to remove water, and placed in a closed environment with constant temperature and humidity (temperature 27°C, humidity 43%) for later use, that is, the amine curing agent modified by hyperbranched polyamidoamin...

Embodiment 3

[0057] S1: Add 30.83g of methylenebisacrylamide, 100ml of N,N-dimethylformamide and 110ml of water into the reaction flask, and stir evenly at room temperature. Bubble nitrogen for 25 minutes, then slowly drop 20.67 g of 1-(2-aminoethyl)piperazine into the above mixed system, raise the temperature to 62° C. and react for 5 days. After the reaction, it was cooled, purified, and vacuum-dried at 30°C for 48 hours to obtain hyperbranched polyamidoamine.

[0058] S2: Add 2.0g of paraformaldehyde, 12g of diethylenetriamine, and 0.1g of hyperbranched polyamidoamine to the reaction flask in sequence, raise the temperature to 110°C and stir for 1.5h, then titrate 32.0g of cardanol, drop it for about 30min, and keep the temperature constant After the reaction was continued for 1 hour, it was cooled, water removed, and placed in a closed environment with constant temperature and humidity (temperature 23°C, humidity 36%) for later use, which is the amine curing agent modified by hyperbran...

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Abstract

The invention relates to a curing agent capable of reducing volatile matters of an adhesive. Through design and synthesis of hyperbranched polyamidoamine, the hyperbranched polyamidoamine, organic amine, cardanol and aldehyde monomers are subjected to Mannich reaction to prepare a low-viscosity modified curing agent, and the low-viscosity modified curing agent is compounded with liquid epoxy resin to obtain the adhesive with high tensile-shear strength and low volatile matter. According to the invention, hyperbranched polyamidoamine with branching degree distribution of 0.1-0.4 and molecular weight distribution of 600-3000 is prepared and introduced into an amine curing agent in a chemical modification manner to prepare the low-viscosity hyperbranched polymer modified curing agent, and then the low-viscosity hyperbranched polymer modified curing agent is compounded with liquid epoxy resin to obtain the adhesive with high tensile-shear strength and low volatile matter. The tensile-shear strength of the adhesive and an aluminum sheet is 18.7 MPa, and the volatile matter content at 150 DEG C within 2 hours is only 0.42%. In addition, thermal weight loss shows that the adhesive also has certain temperature resistance.

Description

technical field [0001] The invention belongs to the field of adhesives, in particular to a curing agent for reducing the volatile content of the adhesive, in particular to a method for preparing an adhesive with high tensile shear strength and low volatile content. Background technique [0002] Adhesives are a class of substances that connect two or more materials together through interfacial adhesion and cohesion. Adhesives have a lot of practicability in production and life, such as common 502 glue, sealant, etc. Since 1950, the use of adhesives in electronic packaging, aerospace and other industries has continued to increase and the requirements for use have also continued to increase. Therefore, the continuous development of adhesives has been promoted, and many defects have been continuously improved. The scope of use of adhesives has gradually expanded in the fields of agriculture, aerospace, manufacturing, transportation, machinery and electronics, etc., providing ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G14/073C08G14/12C08G59/62C09J163/00
CPCC08G14/06C08G14/12C08G59/62C09J163/00
Inventor 童刚生吴刚朱新远任宁范钧琨孙佩张崇印李茂
Owner 上海零号源科技有限公司
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