Method for preparing single-component high-heat-resistance aqueous polyurethane adhesive

A water-based polyurethane, high heat-resistant technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, non-polymer adhesive additives, etc. Low cost and energy consumption per unit product, improved heat resistance, and stable emulsion performance

Inactive Publication Date: 2011-08-17
山西省应用化学研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some of the above-mentioned products are two-component, and some products need to be comp

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 75g of polybutylene adipate and 2.3g of nano-silicon dioxide into a four-neck flask, heat and melt, vacuumize at 100°C for 1.5h, cool down to 60°C, add two drops of dibutyltin dilaurate, and react with 15g of IPDI 2h, then add 2.2g dimethylolpropionic acid and 0.75g triethylene glycol phosphate to react for 0.5h, then add 0.7g1,4-butanediol and keep it warm for 2h, then neutralize with 1.3g triethylamine for 30min At the same time, 10g of acetone was used to reduce the viscosity of the material, and 70g of deionized water was added to quickly disperse, and the solvent acetone was removed by vacuuming to obtain a water-based polyurethane adhesive. This product is a light blue emulsion with a heat-resistant temperature of 175°C, a solid content of 55.3%, and a PVC / PVC peel strength of 5-7N / mm 2 .

Embodiment 2

[0031] Add 75g of polybutylene adipate and 1.7g of nano-silicon dioxide into a four-neck flask, heat and melt, vacuumize at 100°C for 1.5h, cool down to 55°C, add two drops of dibutyltin dilaurate, add 13.5g of IPDI React for 2 hours, then add 2g dimethylol propionic acid and 1g trimethylolpropane to react for 0.5h, add 1g of 1,4-butanediol and keep warm for 2h, neutralize with 1.1g of triethylamine for 30min, and react with 10g of acetone Reduce the viscosity of the material, add 80g of deionized water to quickly disperse, and vacuumize to remove the solvent acetone to obtain a water-based polyurethane adhesive. This product is a light blue emulsion with a heat-resistant temperature of 170°C, a solid content of 52.5%, and a PVC / PVC peel strength of 5-7N / mm 2 .

Embodiment 3

[0033] Add 75g of polybutylene adipate and 3.8g of nano-silicon dioxide into a four-neck flask, heat and melt, vacuumize at 100°C for 1h, cool down to 85°C, add two drops of dibutyltin dilaurate, add 28.5g of IPDI React for 2 hours, then add 5g of dimethylolbutyric acid and 0.8g of trimethylolpropane to react for 0.5h, then add 2.5g of 1,4-butanediol to keep warm for 3h, neutralize with 4.5g of triethylamine for 30min, and Use 20g of acetone to reduce the viscosity of the material, add 101g of deionized water to quickly disperse, vacuumize the acetone to remove the solvent, and obtain a water-based polyurethane adhesive. This product is a light blue translucent emulsion with a heat-resistant temperature of 190°C, a solid content of 51.6%, and a PVC / PVC peel strength of 5-7N / mm 2 .

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Abstract

The invention discloses a preparation method of a single-component high-heat-resistance aqueous polyurethane adhesive, which comprises the following steps: reacting polyester polyol and nano silicon dioxide with diisocyanate to form an isocyanate group(-NCO)-terminated prepolymer; adding a hydrophilic chain extender and a polylol monomer for further reaction; performing chain extension by using small-molecular-weight glycol; regulating the pH value of the reaction solution by neutralizing with triethylamine, adding acetone in an amount which is 5 to 40 percent based on the weight of the polyester polyol to lower the viscosity of the material, and dispersing the solution into light blue semi-transparent emulsion with deionized water; and finally, removing the acetone serving as the solventunder vacuum to obtain the single-component high-heat-resistance aqueous polyurethane adhesive. The single-component aqueous polyurethane adhesive prepared by the method is environmentally-friendly, the solid content of the single-component aqueous polyurethane adhesive can reach 50 percent, the cohesive strength of the single-component aqueous polyurethane adhesive is high, and the single-component aqueous polyurethane adhesive can meet a high-strength adhesion requirement; and more importantly, the tolerable temperature of the adhesive is as high as over 160 DEG C, and the adhesive can be used without adding a curing agent.

Description

technical field [0001] The invention relates to a preparation method of a one-component water-based polyurethane adhesive, in particular to a preparation method of a one-component water-based polyurethane adhesive with high heat resistance. The water-based polyurethane adhesive of the present invention can be used in fields such as computer desks, sound box boards, cabinets, doors and furniture, automotive interior decoration, packaging materials, wood, and PVC. Background technique [0002] Water-based polyurethane is a polymer material developed by replacing organic solvents with water as a dispersion medium. It is safe to use, non-toxic, and has no environmental pollution. It is called a green product. With the advancement of science and technology, and the increasingly stringent requirements of environmental protection laws, environmentally friendly water-based polyurethane has a tendency to replace solvent-based polyurethane. [0003] However, the currently used water-...

Claims

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Application Information

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IPC IPC(8): C09J175/06C09J11/04C08G18/66C08G18/42C08G18/32C08K3/36
Inventor 马国章董永兵张保玲侯彩英耿向东任效东原丽平周艳明
Owner 山西省应用化学研究所
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