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Preparation method of interpenetrating network type waterborne polyurethane-acrylate composite emulsion

A water-based polyurethane, interpenetrating network type technology, applied in the field of preparation of interpenetrating network water-based polyurethane-acrylate composite emulsion, can solve the problems of environmental and human health hazards, incompatibility between acrylate and polyurethane, etc. The effect of stable emulsion performance, strong operability and simple process

Inactive Publication Date: 2015-07-22
XI'AN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a kind of preparation method of interpenetrating network type water-based polyurethane-acrylate composite emulsion, solve the problem that acrylate and polyurethane are in two phases in the interpenetrating network type water-based polyurethane-acrylate composite emulsion prepared by existing methods. The state of compatibility, and the problem that organic solvents must be used in the preparation process to cause harm to the environment and human health

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Step 1: Accurately weigh 48g of polyester diol 218 (relative molecular weight of 1744) and 12g of polyether triol 305 (relative molecular weight of 500) with an analytical balance, place them in a 500mL three-hole flask, and heat up to 120 with a heating mantle. ℃, add 3.612g DMBA into it, after DMBA is completely dissolved, vacuumize at 130℃ for 2h. Stop the vacuum, cool the room temperature to 48°C, blow nitrogen, install a stirring rod, slowly add 21.8mL TDI under stirring at 200r / min, raise the temperature to 78°C and react for 4h to obtain a waterborne polyurethane prepolymer.

[0034] Step 2: Cool down the water-based polyurethane prepolymer system prepared in step 1 to 65°C, add 10.7mL of hydroxyethyl acrylate (HEA) dropwise therein, and perform a capping reaction for 1h; then add 3.1mL of triethylamine (TEA ), neutralization reaction at 60°C for 20min. Add 240mL deionized water and 0.17mL ethylenediamine (EDA) to the system, and start emulsification under full-...

Embodiment 2

[0039] Step 1: Accurately weigh 48g of polyester diol 218 (relative molecular weight: 1744) and 12g of polyether triol 310 (relative molecular weight: 1000) with an analytical balance, place them in a 500mL three-hole flask, and heat up to 130 with a heating mantle ℃, add 3.886g DMBA into it, after DMBA is completely dissolved, vacuumize at 130℃ for 2h. Stop the vacuum, cool the room temperature to 50°C, blow nitrogen, install a stirring rod, slowly add 18.4mL TDI under stirring at 200r / min, raise the temperature to 80°C and react for 4h to obtain a water-based polyurethane prepolymer.

[0040] Step 2: Cool down the water-based polyurethane prepolymer system prepared in step 1 to 67°C, add 9.4mL hydroxyethyl acrylate (HEA), and capping reaction for 1h; then add 3.5mL triethylamine (TEA), 60°C Neutralize for 20 minutes. Add 150mL deionized water and 0.19mL ethylenediamine (EDA) to the system, and start emulsification under full-speed stirring at 1200r / min. After stirring for 1...

Embodiment 3

[0045] Step 1: Accurately weigh 48g of polyester diol 218 (relative molecular weight of 1744) and 12g of polyether triol 310 (relative molecular weight of 1000) with an analytical balance, place them in a 500mL three-hole flask, and heat up to 140 with a heating mantle ℃, add 4.555g DMBA into it, after DMBA is completely dissolved, vacuumize at 130℃ for 2h. Stop the vacuum, cool the room temperature to 52°C, blow nitrogen, install a stirring rod, slowly add 21.7mL TDI under stirring at 200r / min, raise the temperature to 82°C and react for 4h to obtain a waterborne polyurethane prepolymer.

[0046] Step 2: Cool down the waterborne polyurethane prepolymer system prepared in step 1 to 68°C, add 12.4mL hydroxyethyl acrylate (HEA), and capping reaction for 1h; then add 4.3mL triethylamine (TEA), 60°C Neutralize for 20 minutes; add 110 mL of deionized water and 0.31 mL of ethylenediamine (EDA) to the system, and start emulsification under full-speed stirring at 1200 r / min. After sti...

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Abstract

The invention discloses a preparation method of interpenetrating network type waterborne polyurethane-acrylate composite emulsion. The method comprises the following steps: firstly introducing polyether-tribasic alcohol, so as to obtain elastomeric polyurethane prepolymer, then taking hydroxyethyl acrylate as an end-capping reagent, so as to obtain polymerizable waterborne polyurethane dispersion, finally taking the waterborne polyurethane dispersion as seed emulsion, and adopting a full speed pre-emulsification swelling method and a semicontinuous emulsion polymerization method, so as to obtain the interpenetrating network type waterborne polyurethane-acrylate composite emulsion. According to the method, a novel and environmentally friendly hydrophilic chain-extender 2,2-dimethylolbutyric acid (DMBA) is selected, water is adopted as dispersion medium, and no organic solvent, metal catalyst or emulgator is adopted, so that the method conforms to the philosophy of environmental protection. The method is high in operability and simple in technology, and the emulsion prepared through the method is stable in performance.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a preparation method of an interpenetrating network type waterborne polyurethane-acrylate composite emulsion. Background technique [0002] Polyurethane (PU) is a polymer material with excellent performance, which has the advantages of scratch resistance, chemical corrosion resistance, good elasticity, low film forming temperature, room temperature curing, and low energy consumption. Traditional polyurethane needs to use a large amount of organic solvents in the process of processing, and a large amount of volatile organic compounds will be volatilized to the environment during the application process, which has the disadvantages of strong toxicity, heavy odor, and flammability, which will bring serious harm to human health and the environment. harm. Water-based polyurethane (WPU) is a green polymer material developed by replacing organic solvents with wate...

Claims

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Application Information

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IPC IPC(8): C08F283/00C08F220/14C08F220/18C08F220/32C08G18/67C08G18/66C08G18/48C08G18/42C08G18/34C08G18/12
Inventor 赵振河丁长波
Owner XI'AN POLYTECHNIC UNIVERSITY
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