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A kind of recovery method of α-cyanoacrylate dry glue

A technology of cyanoacrylate and recovery method, which is applied in the direction of carboxylic acid nitrile purification/separation, organic chemistry, etc., can solve the problems of environmental pollution, high economic cost, waste of resources, etc., and achieve easy availability of raw materials, improvement of purity, resistance The effect that the poly effect improves

Active Publication Date: 2021-08-31
HEBEI CHENGXIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of resource waste, environmental pollution and high economic cost caused by the improper treatment of α-cyanoacrylate dry glue, the present invention provides a recovery method of α-cyanoacrylate dry glue

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for recovering α-cyanoacrylate dry glue, comprising the following processing steps:

[0026] a. Add 100g of diisooctyl phthalate and 200g of benzene into a 1000ml four-neck bottle equipped with a stirrer, condenser and thermometer, then add 300g of a-cyanoacrylate dry glue slices and slowly Heating, after the temperature rises to 80°C, stir for about 1 hour until the dry glue slices are completely dissolved.

[0027] b. When the mixed solution dissolved in step a cools down to 50°C, slowly add 20g of 20% sodium bicarbonate solution under stirring, and after stirring for 1 hour at 50°C, transfer the feed solution to a separatory funnel After standing in the middle for 12h, the lower aqueous phase and flocs were separated, and the upper organic phase was transferred into a four-necked flask with a water separator.

[0028] c. Add 2 g of phosphoric acid to the organic phase from which the water phase has been removed, and carry out azeotropic dehydration by raisi...

Embodiment 2

[0032] A method for recovering α-cyanoacrylate dry glue, comprising the following processing steps:

[0033] a. Add 80g triethyl citrate and 150g toluene to a 1000ml four-necked bottle equipped with a stirrer, a condenser and a thermometer, then add 300g a-isopropyl cyanoacrylate dry glue slices and heat slowly under stirring, After the temperature rises to 80°C, stir for about 1 hour until the dry glue slices are completely dissolved.

[0034] b, when the mixed solution dissolved in step a is cooled to 45°C, slowly add 18g of 20% sodium carbonate solution under stirring, after stirring at 50°C for 1h, transfer the feed liquid to a separatory funnel and let it stand for 12h. After the lower aqueous phase and flocs were separated, the upper organic phase was transferred to a four-necked flask with a water separator.

[0035] c. Add 1.5% sulfuric acid to the organic phase from which the water phase has been removed, and carry out azeotropic dehydration by raising the temperatur...

Embodiment 3

[0039] A method for recovering α-cyanoacrylate dry glue, comprising the following processing steps:

[0040] a. Add 120g of tris-(4-tert-butylphenyl) phosphate and 250g of benzene in a 1000ml four-neck flask equipped with a stirrer, condenser and thermometer, and then add 300g of n-butyl cyanoacrylate dry glue Slice and heat slowly under stirring. After the temperature rises to 80°C, stir for about 1 hour until the dry glue slices are completely dissolved.

[0041] b. When the mixed solution dissolved in step a is cooled to 50°C, slowly add 20g of 20% sodium bicarbonate solution under stirring, and after stirring for 1 hour at 50°C, transfer the feed solution to a separatory funnel After standing in the middle for 12h, the lower aqueous phase and flocs were separated, and the upper organic phase was transferred into a four-necked flask with a water separator.

[0042] c. Add 1 g of hydrochloric acid to the organic phase from which the water phase has been removed, and carry o...

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Abstract

The present invention relates to the technical field of recovery and utilization of α-cyanoacrylate, and specifically discloses a recovery method of α-cyanoacrylate dry glue, which comprises the following process steps: a, combining α-cyanoacrylate dry glue with plasticizer Mix the solvent with the organic solvent, heat and dissolve to obtain a mixed solution; b, add an alkaline solution to the mixed solution to wash and remove impurities, and remove the water phase after standing for stratification; c, add acid to the organic phase from which the water phase has been removed to adjust the pH value to 2-3, and carry out dehydration and removal of organic solvent; d, add a polymerization inhibitor, carry out cracking under reduced pressure, obtain α-cyanoacrylate monomer. The invention discloses a method for recycling and reusing a-cyanoacrylate polymer that turns waste into treasure. The method is simple in operation, readily available in raw materials, easy in large-scale production, and has remarkable economic benefits.

Description

technical field [0001] The invention relates to the technical field of recycling α-cyanoacrylate, in particular to a method for recycling α-cyanoacrylate dry glue. Background technique [0002] α-cyanoacrylate adhesive is a type of structural adhesive widely used by the public. Because of its unique chemical carbon-carbon double bond structure, it can be used in a very short time in the presence of trace moisture in the air. Even within seconds, the adhesive joint can be cured. [0003] The most common type of α-cyanoacrylate adhesive is α-ethyl cyanoacrylate (commonly known as 502), which is a one-component fast-curing adhesive. At present, multifunctional cyanoacrylate adhesives have also been developed on the market. Adhesives, such as low-whitening toughened α-methoxyethyl cyanoacrylate and α-ethoxyethyl cyanoacrylate, can replace n-butyl cyanoacrylate medical adhesive for wound sutures. α-cyanoacrylate adhesive has the characteristics of fast curing, wide range of bon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C253/34C07C255/23
Inventor 李成果李娟王虹高强董津范春艳刘少军
Owner HEBEI CHENGXIN
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