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Amphoteric waterborne polyurethane shoe adhesive with high solid content and preparation method thereof

A water-based polyurethane, high solid content technology, applied in the direction of polyurea/polyurethane adhesive, preparation of organic compounds, preparation of amino hydroxyl compounds, etc., can solve the problems of difficult to control reaction speed, same activity, unfavorable production, etc. The effect of mechanical properties, strong cohesion and short drying time

Inactive Publication Date: 2015-01-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The cross-linking monomer in domestic polyurethane synthesis mainly adopts trimethylolpropane, such as CN-102516920, CN-102827571, but the activity of the trimethylolpropane reactive group is the same, the reaction speed is difficult to control, and it is easy to gel, which is not conducive to production

Method used

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  • Amphoteric waterborne polyurethane shoe adhesive with high solid content and preparation method thereof
  • Amphoteric waterborne polyurethane shoe adhesive with high solid content and preparation method thereof
  • Amphoteric waterborne polyurethane shoe adhesive with high solid content and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The cationic hydrophilic cross-linking agent used in the embodiment of the present invention, the preparation method is as follows:

[0057] In parts by weight, 149 parts by weight of triethanolamine and 90 parts by weight of 2-hydroxypropionic acid are uniformly dissolved in 50 parts by weight of acetone, and then added to a four-necked flask equipped with an electric stirrer and a serpentine reflux pipe, Heat up to 40-50°C, reflux at constant temperature for 0.5-1h, cool to room temperature, filter, then distill under reduced pressure at -0.1MPa vacuum and 50-55°C for 2h to remove acetone and water to obtain cationic hydrophilic crosslinking Agent, the structural formula of gained cationic hydrophilic cross-linking agent is as follows:

[0058]

Embodiment 2

[0060] An amphoteric water-based polyurethane shoe adhesive with high solid content, the formula composition and dosage are shown in Table 1, and the specific preparation steps are as follows:

[0061] Add the formulated amount of poly-1,4-butylene adipate into a polymerization reactor equipped with a digital display electric mixer and a thermometer, raise the temperature to 120°C, distill and remove water under reduced pressure, and keep warm for 2 hours to remove water After water removal, cool down to 50-60°C; add catalysts dibutyltin dilaurate and toluene diisocyanate into the polymerization reactor, raise the temperature to 65°C, stir for 2 hours; then cool down to 60°C, add 1,4-butyl Diol and the cationic hydrophilic cross-linking agent described in Example 1 were stirred and reacted for 1.5 h; then the temperature was lowered to 55° C., acetone was added, and after stirring for 15 min, 50% mass fraction of sodium ethylenediaminoethanesulfonate aqueous solution was added,...

Embodiment 3

[0065] An amphoteric water-based polyurethane shoe adhesive with a high solid content, the formula composition and dosage are shown in Table 2, and the specific preparation steps are as follows:

[0066] Add the formulated amount of poly-1,4-butylene adipate into a polymerization reactor equipped with a digital display electric mixer and a thermometer, raise the temperature to 120°C, distill and remove water under reduced pressure, and keep warm for 2 hours to remove water After water removal, cool down to 50-60°C; add catalysts dibutyltin dilaurate and toluene diisocyanate into the polymerization reactor, raise the temperature to 65°C, stir for 2 hours; then cool down to 60°C, add 1,4-butyl Diol and the cationic hydrophilic cross-linking agent described in Example 1 were stirred and reacted for 1.5 h; then the temperature was lowered to 55° C., acetone was added, and after stirring for 15 min, 50% mass fraction of sodium ethylenediaminoethanesulfonate aqueous solution was adde...

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Abstract

The invention belongs to the technical field of waterborne polyurethane adhesive, and discloses an amphoteric waterborne polyurethane adhesive with high solid content and a preparation method thereof. The preparation method comprises the following steps: synthesizing an amino-containing cationic hydrophilic cross-linker; adding polyester polyol into a polymerization reactor, distilling under reduced pressure to remove water, adding polyisocyanate and a catalyst, and reacting while stirring; adding the cationic hydrophilic cross-linker and a chain extender, and reacting while stirring; adding an organic solvent and a hydrophilic chain extender containing a sulfonic acid group, and continuously reacting while stirring; adding water and a silicane coupling agent to a dispersion barrel filled with the reactant, performing high-speed shear emulsification, and adding a post chain extender for reacting; and distilling under reduced pressure, and then adding a defoaming agent and a thickener to obtain the amphoteric waterborne polyurethane shoe adhesive with high solid content. The amphoteric waterborne polyurethane shoe adhesive with high solid content substantially does not have solvent residue, has excellent mechanical properties and good water and heat resistance, and can substitute the present commercial mature solvent type adhesive.

Description

technical field [0001] The invention belongs to the technical field of water-based polyurethane adhesives, in particular to an amphoteric water-based polyurethane shoe adhesive with high solid content and a preparation method thereof. Background technique [0002] my country is a big country in the production, consumption and export of shoes and boots, but it is not a strong country in shoemaking, and its per capita consumption is also low. In 2007, the output was more than 10 billion pairs, and the export was 8.17 billion pairs. The vast majority are glued shoes, basically using solvent-based adhesives, with an annual glue consumption of about 300,000 tons (non-volatile matter fraction <20%). Polyurethane adhesives have the characteristics of low temperature resistance, good flexibility, strong bonding performance, and good flexibility and hardness adjustability, and their usage in the shoemaking industry is increasing year by year. [0003] Polyurethane adhesives in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06C09J11/06C08G18/76C08G18/66C08G18/42C08G18/32C08G18/10C07C213/08C07C215/12C07C51/41C07C59/06
Inventor 涂伟萍刘文济王锋
Owner SOUTH CHINA UNIV OF TECH
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