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Preparation method of polyurethane-grafted polyacrylate aqueous dispersion

A technology of polyacrylate and hydroxyl-terminated polyacrylate is applied in the field of preparation of polyurethane grafted polyacrylate aqueous dispersion to achieve the effects of reducing sensitivity and improving solvent resistance.

Inactive Publication Date: 2015-04-29
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In none of these methods was the use of hydroxyl-terminated polyacrylates to graft polyurethanes

Method used

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  • Preparation method of polyurethane-grafted polyacrylate aqueous dispersion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Preparation of hydroxyl-terminated polybutylmethacrylate with molecular weight of 5000

[0026] In a 500mL four-necked flask equipped with a thermometer, 100g of butyl methacrylate, 5.3111g of hydroxybutyl α-bromoisobutyrate (purity is 90%), CuBr 2 0.07909g, pentamethyldiethylenetriamine (PMDETA) 0.6137g, stannous octoate Sn(EH) 2 2. 1551 g, 50 g of anisole, mechanically stirred to mix evenly, bubbling for 5 minutes to remove oxygen in the system, and continuing the bubbling reaction in an oil bath at 70° C. for 3.5 hours, the conversion rate was 88%. The molecular weight M was measured by gel permeation chromatography (GPC) n =5400, molecular weight distribution PDI=1.36. In this reaction, the amount of the catalyst used is 500 ppm of the molar amount of the monomer, and a polymer with controllable molecular weight and narrow molecular weight distribution is obtained.

[0027] (2) Preparation of Polyurethane Grafted Polybutylmethacrylate Aqueous Dispersion

[0...

Embodiment 2

[0030] (1) Preparation of hydroxyl-terminated polymethyl methacrylate with molecular weight of 10000

[0031] In a 500mL four-necked flask equipped with a thermometer, add 100g of methyl methacrylate, 2.6556g of hydroxybutyl α-bromoisobutyrate (purity is 90%), CuBr 2 0.1117g, PMDETA 0.8318g, Sn(EH) 2 3. Mix 0883g and 50g of anisole with mechanical stirring, remove the oxygen in the system by bubbling for 5min, continue bubbling in an oil bath at 70°C for 3.5h, and the conversion rate is 86%. The molecular weight M was measured by gel permeation chromatography (GPC) n =9800, molecular weight distribution PDI=1.34. In this reaction, the amount of the catalyst used is 500 ppm of the molar amount of the monomer, and a polymer with controllable molecular weight and narrow molecular weight distribution is obtained.

[0032] (2) Preparation of Polyurethane Grafted Polymethyl Methacrylate Aqueous Dispersion

[0033] First, add 2.1593g of dimethylol propionic acid, 9g of polyether ...

Embodiment 3

[0035] (1) Preparation of hydroxyl-terminated polyethylacrylate with molecular weight of 8000

[0036] In a 500mL four-necked flask equipped with a thermometer, 100g of ethyl acrylate, 3.3194g of hydroxybutyl α-bromoisobutyrate (purity is 90%), CuBr 2 0.1115g, PMDETA 0.8654g, Sn(EH) 2 3. 0346g, 50g of anisole, mechanically stirred and mixed evenly, bubbling for 5 minutes to remove oxygen in the system, and continuing bubbling reaction in an oil bath at 70°C for 3.5h, the conversion rate was 89%. The molecular weight M was measured by gel permeation chromatography (GPC) n =7800, molecular weight distribution PDI=1.32. In this reaction, the amount of the catalyst used is 500 ppm of the molar amount of the monomer, and a polymer with controllable molecular weight and narrow molecular weight distribution is obtained.

[0037] (2) Preparation of Polyurethane Grafted Polyethylacrylate Aqueous Dispersion

[0038] First, add 1.9181g of dimethylolpropionic acid, 9g of polyether dio...

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Abstract

The invention relates to a preparation method of a polyurethane-grafted polyacrylate aqueous dispersion. The method comprises the following steps: (1) preparation of terminal hydroxyl polyacrylate: adding an initiator, a monomer, a catalyst, a ligand, a reducing agent and a solvent I to a reaction container, vacuumizing a reaction system, introducing nitrogen and reacting, so as to prepare terminal hydroxyl polyacrylate; and (2) preparation of the polyurethane-grafted polyacrylate aqueous dispersion: adding a hydrophilic chain extender, dihydric alcohol, trihydric alcohol and the terminal hydroxyl polyacrylate to a reaction container, adding diisocyanate, adding the prepared polyacrylate-amine ester prepolymer to water and dispersing, so as to obtain the polyurethane-grafted polyacrylate aqueous dispersion. The method has the beneficial effects that the compatibility of polyacrylate and polyurethane is achieved by introducing the polyacrylate into polyurethane; and the mechanical property, the water resistance and the solvent resistance of the polyurethane-grafted polyacrylate aqueous dispersion are effectively improved.

Description

technical field [0001] The invention belongs to the field of chemical materials, and relates to a preparation method of polyurethane grafted polyacrylate aqueous dispersion. Background technique [0002] Polyurethane (PU for short) is an important polymer material made by the reaction of polyisocyanate, polyol, and organic small molecule polyol (chain extender). Traditional polyurethane uses organic substances as solvents. The products often contain organic volatile substances such as benzene, ethers, and ketones. These organic substances are explosive, flammable, smelly and toxic, pollute the environment and endanger people’s health. Working in such an environment for a long time will cause Seriously injure people's bodies. Waterborne polyurethane (WPU) came into being. Water-based polyurethane (WPU) uses water as the dispersion medium. It does not contain or contains a small amount of organic solvents. It has the advantages of non-combustibility, non-toxicity, energy sav...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/62C08G18/48C08F120/18C08F120/14C08F120/44
CPCC08F120/14C08F120/18C08F120/44C08F293/005C08G18/0823C08G18/348C08G18/4063C08G18/48C08G18/4812C08G18/6225C08G18/6245C08G18/6262C08G18/633C08G18/638C08G18/6511C08G18/6607C08G18/6692C08G18/7621
Inventor 李坚孙仪琳冯皓刘新任强汪称意
Owner CHANGZHOU UNIV
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