Method for synthesizing dimer acid type polyamide hot melt adhesive

A polyamide hot-melt adhesive, dimer acid type technology, applied in the direction of adhesives, etc., can solve the problems of complex synthesis process, limited raw materials, poor compatibility, etc., and achieve the effects of easy chemical equivalent, stable product production, and simple operation.

Inactive Publication Date: 2012-06-13
SHANGHAI TIANYANG HOT MELT ADHESIVE CO LTD +2
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0006] There are some deficiencies in the preparation methods of polyamide hot-melt adhesives mentioned in the above-mentioned patents. Patent CN1357589A needs to synthesize components A and B respectively, and then blend them. The synthesis process is relatively complicated, resulting in product batches. The difference between times is bigger; patent CN1415686A uses the aqueous solution of amine as reaction raw material, causes like this to limit to the raw material used in reaction, because the compatibility of dimer ac

Method used

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  • Method for synthesizing dimer acid type polyamide hot melt adhesive

Examples

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Comparison scheme
Effect test

Embodiment 1

[0018] In the high-pressure reactor of 2000ml, drop into 678 grams of dimer acid (British Croda Company, Pripol1006), hexamethylenediamine 139.6g, 20% ethanol aqueous solution 250g, 1010 antioxidant 0.9g and stearic acid 2.0g, in 2.0h Internally raise the temperature to 250°C, as the temperature rises, when the pressure in the reactor reaches 1.0MPa, keep the reaction for 1h, then reduce the pressure of the reactor to normal pressure within 2h, and keep the normal pressure for 1h, then pass nitrogen Pressurize to 0.2MPa, discharge, and get product P1

Embodiment 2

[0020] In the high-pressure reactor of 2000ml, drop into 649.8 grams of dimer acid (British Croda Company, Pripol1006), sebacic acid 10.1g, hexamethylenediamine 139.6g, 33% ethanol aqueous solution 300g, 1010 antioxidant 0.3g and stearic acid 1.5g, heat up to 250°C within 2.5h, keep the reaction for 1h when the pressure in the reactor reaches 1.5MPa, then reduce the pressure of the reactor to normal pressure within 2h, and keep the normal pressure for 1h, add nitrogen Press to 0.2MPa, discharge, and get product P2

Embodiment 3

[0022] In the high-pressure reactor of 2000ml, drop into 628.2 grams of dimer acid (British Croda Company, Pripol1006), adipic acid 7.8g hexamethylenediamine 139.6g, water 200g, ethanol mixed solution 100g, 1010 antioxidant 0.3g and stearin Acid 2.0g, heat up to 250°C within 3.0h, keep the reaction for 1h when the pressure in the reactor reaches 1.8MPa, then reduce the pressure of the reactor to normal pressure within 3h, and keep the normal pressure for 1h, pass nitrogen Pressurize to 0.2MPa, discharge, and get product P3

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Abstract

The invention discloses a method for synthesizing a dimer acid type polyamide hot melt adhesive. The polyamide hot melt adhesive is prepared by adding a catalyst, an aqueous solution of alcohol and an aid into monomers of dimer acid, aliphatic dicarboxylic acid and aliphatic diamine which are taken as reaction raw materials and performing condensation reaction. The method is easy to operate, the loss of amine in the reaction process is low, and the chemical equivalent can be controlled easily, so that the reaction is more complete, and finally a product with stable high molecular weight can be obtained; meanwhile, the deviation among different batches of products can also be improved, so that the product can be stably produced.

Description

technical field [0001] The invention relates to a synthesis method of dimer acid type polyamide hot melt adhesive, which is especially suitable for preparing dimer acid type polyamide hot melt adhesive with high reaction degree. Background technique [0002] Dimer acid polyamide hot melt adhesive is a kind of dimeric unsaturated aliphatic or partially substituted dimer unsaturated fatty acid and aliphatic diamine through polycondensation reaction. [0003] Chinese patent CN1357589A discloses a method of synthesizing component A by partially substituted dimer acid and diamine in the presence of a modifier and a catalyst; The basic acid and the diamine synthesize component B under high pressure conditions, and finally mix component A and component B in a certain proportion. [0004] Chinese patent CN1415686A discloses a solution in which an aliphatic diamine is formulated into an aqueous solution and reacted with an aliphatic dibasic acid to finally generate a polyamide hot m...

Claims

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Application Information

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IPC IPC(8): C08G69/34C09J177/08
Inventor 李哲龙朱万育施才财曾作祥韩涛陶思玉
Owner SHANGHAI TIANYANG HOT MELT ADHESIVE CO LTD
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