Sulfonic acid type hydrophilic chain extender and preparation method thereof

Abstract

A hydrophilic chain extender of sulfonic acid type which pertains to chemical product, and preparation thereof. The invention mainly aims to solve the problems of slow reaction rate of hydrophilic chain extender used in aqueous polyurethanel industry, low content of aqueous resin, low heat resistance, low adhesion strength when applying to adhesive. The eligible product is obtained by fully dissolving multi-amine such as 0.5-1.5 parts of ethylenediamine into solvent, reacting with olefin sulfonate such as 5-9 parts of vinyl sodium sulfonate solution with about 25% of water for 4-30 hours at the temperature of 40-100 DEG C., vacuum distilling to remove solvent, dissolving with water, alcohol or ketone, vacuum distilling to remove all solvent for another time after deposition and filter. Stability treatment for storage is further carried out by adding water. The final product is slightly turbid vicous liquid in light yellow color and oil state, with density at 1.16-1.21 g / ml, pH at 11-12, content of ammonia at 6.9+-0.9g NH3 / 100g, effective content 40-55%. The invention can widely used into production of aqueous polyurethane of different fields, which has a fast reaction rate, high yield, highly enhanced content of solid in prepared aqueous resin, and obviously improved resistance of heat, acid, alkali, hard water, and is greatly beneficial for preparation of adhesive.

Description

technical field [0001] The invention belongs to the field of chemicals and preparation methods thereof, and relates to a sulfonic acid type hydrophilic chain extender and a preparation method thereof. Background technique [0002] At present, most of the popular hydrophilic chain extenders in the water-based polyurethane industry are carboxylic acid type, such as DMPA—that is, 2.2-dihydroxymethylpropionic acid, DMBA—that is, 2.2-dihydroxymethylbutyric acid, etc., and their reactive groups are Hydroxyl, hydroxyl has low reactivity, and the water-based group is carboxyl, which has low hydrophilicity and slow water solubility. It takes about 6 hours to complete the chain extension process at 50°C. Because the hydrophilicity of carboxyl is very low, therefore , the solid content of the prepared water-based resin is generally low. To increase the solid content, a large amount of chain extender needs to be consumed. At the same time, because the carboxylic acid is acidic, the carb...

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Problems solved by technology

[0002] At present, most of the popular hydrophilic chain extenders in the water-based polyurethane industry are carboxylic acid type, such as DMPA—that is, 2.2-dihydroxymethylpropionic acid, DMBA—that is, 2.2-dihydroxymethylbutyric acid, etc., and their reactive groups are Hydroxyl, hydroxyl has low reactivity, and the water-based group is carboxyl, which has low hydrophilicity and slow water solubility. It takes about 6 hours to complete the chain extension process at 50°C. Because the hydrophilicity of carboxyl is very low, therefore , the solid content of the prepared water-based resin is generally low. To increase the solid content, a large amount of chain extender needs to be consumed. At the same time, because the carboxylic acid is acidic, the carboxyl group is a positive group. Neutralize with triethylamine, and triethylamine is volatile, so that the prepared water-based resin has low heat resistance, acid and alkali resistance and hard water resistance, and the polarity of carboxylic acid is low, which also makes the prepared water-based resin Low adhesion and low bond strength when the resin is applied to the adhesive

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