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A modified fingerprint fumigant based on cyanoacrylate and its preparation method

A technology of cyanoacrylate and cyanoacrylic acid, which is applied in medical science, diagnosis, diagnostic recording/measurement, etc., and achieves the effects of simple preparation method, easy-to-obtain raw materials and cheap raw materials

Inactive Publication Date: 2018-11-27
SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The "502" glue currently on the market cannot meet these needs

Method used

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  • A modified fingerprint fumigant based on cyanoacrylate and its preparation method
  • A modified fingerprint fumigant based on cyanoacrylate and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] [Example 1] Synthesis of 2-ethyl cyanoacrylate monomer

[0023] Add 15.6g (0.52mmol) of paraformaldehyde, 74mg of hexahydropyridine and 50ml of ethyl acetate to a 250ml three-neck flask with a thermometer and a reflux condenser, raise the temperature to 75°C, and add 57g (0.50mL) dropwise within 30 minutes. mmol) ethyl cyanoacetate, react at this temperature for 40 minutes, add 20g dioctyl phthalate and heat up to 125°C, cool slightly, add 0.6g phosphoric acid and 50ml cyclohexane, add a water separator, Slowly raise the temperature to 130°C, distill out water, ethyl acetate and cyclohexane, and when no solvent is evaporated, cool slightly, add 2.5g of phosphorus pentoxide and 1g of p-phenol, under the conditions of 20mmHg, 160°C to 180°C The crude monomer was obtained by depolymerization under reduced pressure and distillation under reduced pressure. The crude monomer was rectified under reduced pressure under the condition of 10-20 mmHg to obtain pure colorless and t...

Embodiment 2

[0024] [Example 2] Preparation of phenolic inhibitor modified fumigant

[0025] Under nitrogen protection and room temperature, add 50g of ethyl 2-cyanoacrylate to a 100ml three-necked flask, add 20mg of 4-methyl-2,6-di-tert-butylphenol under stirring, stir, and dissolve completely to obtain a new Fumigant.

Embodiment 3

[0026] [Example 3] Preparation of phenolic inhibitor modified fumigant

[0027] Add 50g of ethyl 2-cyanoacrylate to a 100ml three-necked flask under nitrogen protection, add 100mg of 4-tert-butylphenol under stirring, stir, and dissolve completely to obtain a new fumigant.

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Abstract

The invention provides a modified fingerprint fuming agent based on cyanoacrylate and a preparation method. Through adding tert-butylphenol in cyanoacrylate, or adding chloralkane or alkane or phthalate and other diluents on the basis, and fingerprint fuming agents in a series different fuming effects can be prepared. The fingerprint fuming agent is characterized by simple manufacturing method, and cheap and easily available raw materials, and the prepared fuming agent can satisfy various requirements.

Description

technical field [0001] The invention discloses a modified fingerprint fumigant based on cyanoacrylate and a preparation method. Background technique [0002] Fingerprint reconstruction at crime scenes often plays a key role in criminal investigations and court proceedings. Common latent fingerprint display techniques mainly include physical, chemical, and optical methods. According to the different properties of latent fingerprints and trace objects, choose the corresponding display method. 2-Ethyl cyanoacrylate fingerprint fumigation method (ie "502" glue fumigation method) is the most commonly used method for revealing non-permeable objects. [0003] Due to the strong volatility of "502" glue, it reacts with potential fingerprints in a gaseous state, which is very beneficial to the use of large-area and complex-shaped trace objects. "502" glue fumigation method also has high sensitivity, easy operation, low cost, and wide application range Wide and other advantages, it c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/1172
CPCA61B5/1172
Inventor 李晓强郑玉梅顾军俞艳杨军赵雪珺糜忠良田巍刘文斌
Owner SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI
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