Production process for alpha-cyanoethyl acrylate adhesive

A production process technology of ethyl cyanoacrylate, which is applied in the field of production process of α-ethyl cyanoacrylate adhesive, can solve the problem of low stability of α-ethyl cyanoacrylate adhesive, and achieve easy trace moisture, Thoroughly dehydrated and easy to remove

Active Publication Date: 2016-03-30
湖南浩森胶业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the industry has been continuously researching and expanding its production proc...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 1. Synthesis: After converting 110g of 93% solid formaldehyde imported from Spain into water, add 320g of solvent 1,2-dichloroethane, and start to drop a mixture of 400g of ethyl cyanoacetate and 1.4mL of pyridine at 30°C, and control the temperature At about 50°C, after 1.5 hours of dropwise addition, use an electric heating pot to raise the temperature to 70°C and start to keep warm for 2 hours. After the heat preservation is completed, add 6g of phosphoric acid, stir for 15 minutes, and stand still for stratification.

[0050] 2. Dehydration: After adding the solvent 1,2-dichloroethane from the bottom of the reactor again, start to heat up, and start to produce monomer at 68°C, and then heat up to 120°C after the solvent in the condenser tube and the bottle is removed. Turn on the vacuum drawing, and after the drawing is completed, add a mixture of 40g of dioctyl ester, 8g of disulfur pentoxide, and 4g of hydroquinone, and finally add 10 drops of strong acid to the bo...

Embodiment 2

[0055] 1. Synthesis: After converting 112g of 93% solid formaldehyde imported from Spain into water, add 320g of solvent 1,2-dichloroethane, and start to drop a mixture of 400g of ethyl cyanoacetate and 1.6mL of pyridine at 30°C, and control the temperature At about 60°C, after 1.5 hours of dropwise addition, use an electric heating pot to raise the temperature to 70°C and start to keep warm for 2 hours. After the heat preservation is completed, add 6g of phosphoric acid, stir for 15 minutes, and stand still for stratification.

[0056] 2. Dehydration: After adding the solvent 1,2-dichloroethane from the bottom of the reactor again, start to heat up, and start to produce monomer at 68°C, and then heat up to 120°C after the solvent in the condenser tube and the bottle is removed. Turn on the vacuum drawing, and after the drawing is completed, add a mixture of 40g of dioctyl ester, 8g of disulfur pentoxide, and 4g of hydroquinone, and finally add 10 drops of strong acid to the bo...

Embodiment 3

[0061] 1. Synthesis: After converting 110g of 93% solid formaldehyde imported from Spain into water, add 400g of solvent 1,2-dichloroethane, and start to drop a mixture of 400g of ethyl cyanoacetate and 1.4mL of pyridine at 30°C, and control the temperature At about 50°C, after 1.5 hours of dropwise addition, use an electric heating pot to raise the temperature to 70°C and start to keep warm for 2 hours. After the heat preservation is completed, add 6g of phosphoric acid, stir for 15 minutes, and stand still for stratification.

[0062] 2. Dehydration: After adding the solvent 1,2-dichloroethane from the bottom of the reactor again, start to heat up, and start to produce monomer at 68°C, and then heat up to 120°C after the solvent in the condenser tube and the bottle is removed. Turn on the vacuum drawing, and after the drawing is completed, add a mixture of 50g of dioctyl ester, 10g of disulfur pentoxide, and 5g of hydroquinone, and finally add 10 drops of strong acid to the b...

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PUM

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Abstract

The invention provides a production process for an alpha-cyanoethyl acrylate adhesive. The production process comprises the following steps: under the action of a catalyst, subjecting ethyl cyanoacetate, solid formaldehyde and an organic solvent to condensation polymerization in a reaction vessel so as to obtain a reaction system; then adding an organic solvent into the reaction system from the bottom of the reaction vessel and then carrying out condensation, reflux and dehydration; and finally, adding an auxiliary agent into the reaction system obtained in the previous step and carrying out a cracking reaction so as to obtain the alpha-cyanoethyl acrylate adhesive. The production process employs specific reaction steps, so yield is further improved, and production cost is reduced; and in particular, after completion of condensation polymerization and synthesis reaction of materials, the organic solvent is added from the bottom of reaction vessel and an external reflux and dehydration manner is employed, so dehydration is more thorough, removal of a trace amount of moisture is much easier, stability of the adhesive is improved, and the shelf-life of the adhesive is further prolonged.

Description

technical field [0001] The invention belongs to the technical field of adhesives, in particular to a production process of α-ethyl cyanoacrylate adhesive. Background technique [0002] Adhesive refers to a class of organic or inorganic, natural or synthetic substances that can connect the surfaces of the same or two or more homogeneous or heterogeneous parts (or materials) together and have sufficient strength after curing. Collectively referred to as adhesives or adhesives, adhesives, customarily referred to as glue. The adhesive has the characteristics of continuous stress distribution, light weight, or sealing, and most of the process temperature is low, especially suitable for the connection of different materials, different thicknesses, ultra-thin specifications and complex components. With the rapid development of bonding technology in modern times, adhesives are widely used in industries and have a major impact on the progress of high-tech science and technology and ...

Claims

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Application Information

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IPC IPC(8): C07C253/30C07C253/34C07C255/23C08G16/02
CPCC07C253/30C07C253/34C08G16/0231C07C255/23
Inventor 张长权万传发
Owner 湖南浩森胶业有限公司
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