Waterborne polyurethane and synthetic method thereof

A technology of water-based polyurethane and synthesis method, which is applied in the field of polymer chemistry and polymer material science, can solve the problems of low content, consumption, and low molecular weight of the polymer, and achieve the effect of simple synthesis method and easy realization

Inactive Publication Date: 2010-02-03
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the traditional water-based polyurethane synthesis, when the end of the prepolymer is aliphatic isocyanate, when the prepolymer is dispersed in water, some of the isocyanate groups will react with water to form amino groups and be consumed, making chain extension impossible. reaction
When the end of the prepolymer is an aromatic isocyanate, during the water dispersion process of the prepolymer, because the reaction rate of the isocyanate group and water is higher, the remaining isocyanate that can effectively carry out the chain extension reaction after water dispersion Lower content of cyanate groups and lower polymer molecular weight, resulting in poorer mechanical properties

Method used

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  • Waterborne polyurethane and synthetic method thereof
  • Waterborne polyurethane and synthetic method thereof
  • Waterborne polyurethane and synthetic method thereof

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preparation example Construction

[0022] The method for synthesizing water-based polyurethane proposed by the present invention uses raw materials including benzophenone I, isopropanol II, polymer glycol III, diisocyanate IV, itaconic acid V and vinylpyrrolidone VI, and the structure of each raw material The expression is:

[0023]

[0024] The synthesis method includes the following steps:

[0025] (1) Mix 0.05-10 mol of benzophenone and 0.25-50 mol of isopropanol, and then add 0.01 to 0.2% of the first catalyst, which accounts for the total mass of benzophenone and isopropanol, at a temperature of 10 to 35°C. At temperature, react under ultraviolet light for 1-10 hours to obtain 1,1,2,2-tetraphenylethylene glycol. The reaction formula is as follows:

[0026]

[0027] (2) Mix 0.01-10 mol polymer diol and 0.03-20 mol diisocyanate, add solvent, stir and mix at 60-85°C under the protection of nitrogen for 1 to 4 hours to obtain a prepolymer; the temperature is reduced to 20-45 ℃, then add the above 1,1,2,2-tetrapheny...

Embodiment 1

[0033] (1): First mix benzophenone (0.1mol) and isopropanol (0.5mol), then add acetic acid (0.005mol), the mixture is charged into a 500mL round-bottomed flask, at a temperature of 25℃, After exposure to 365nm ultraviolet light, the product (1,1,2,2-tetraphenylethylene glycol) was precipitated, and the precipitated product was purified by recrystallization from acetic acid.

[0034] The product was characterized by NMR, 1 H-NMR(CDCl 3 ): δ=3.05 (0H, 2H), 7.00-7.50 (phenyl, 20H).

[0035] (2): Mix polytetrahydrofuran ether glycol (0.01mol) and 4,4'-diphenylmethane diisocyanate (0.02mol) into 100mL tetrahydrofuran, and the mixture is charged into a 500mL three-neck round bottom flask, protected by nitrogen Stir and mix and react for 3 hours at 75°C to obtain a prepolymer; the temperature is reduced to 35°C, and 1,1,2,2-tetraphenylethylene glycol (0.01mol) is added, and the molar ratio of the addition is: 1,1 , 2,2-tetraphenylethylene glycol: diisocyanate = 1:2, then add 0.02% dibuty...

Embodiment 2

[0040] (1): First mix benzophenone (0.1mol) and 2-propanol (0.5mol), and then add acetic acid (0.005mol). The mixture is put into a 500mL round-bottomed flask and kept at a temperature of 30℃ After exposure to 365nm ultraviolet light, the product (1,1,2,2-tetraphenylethylene glycol) was precipitated, and the precipitated product was purified by recrystallization from acetic acid.

[0041] (2): Mix polycarbonate 1,4-butanediol ester diol (0.01mol) and 2,6-toluene diisocyanate (0.02mol) into 100mL methyl ethyl ketone, and the mixture is charged into a 500mL three-necked round bottom flask , Under the protection of nitrogen, stir and mix and react at 85°C for 3 hours to obtain a prepolymer; the temperature is reduced to 35°C, and 1,1,2,2-tetraphenylethylene glycol (0.01mol) is added, and the molar ratio is :1,1,2,2-tetraphenylethylene glycol: diisocyanate = 1:2, then add 0.03% of stannous octoate based on the total weight of the reactants, stir and react for about 10 hours; the prod...

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Abstract

The invention relates to waterborne polyurethane and a synthetic method thereof, belonging to the technical field of high polymer material. The material is polyurethane with a main chain inserted intohydrophilic vinyl monomers, and the raw materials adopted in the method of the invention comprise benzophenone, isopropanol, polymeric diol, diisocyanate, itaconic acid and vinyl pyrrolidone. The method comprises the following steps: firstly mixing the raw materials, then adding a first catalyst and reacting under ultraviolet irradiation to obtain product 1,1,2,2-tetraphenylglycol, then purifyingthrough the recrystallization with acetic acid, adding solvent after mixing, stirring and mixing to react and obtain prepolymer; then adding 1,1,2,2-tetraphenylglycol to mixing, adding a second catalyst to obtain a reactant, purifying to obtain polyurethane with terminal groups containing tetraphenylglycol, mixing the obtained polyurethane with the prepolymer to react, and purifying to obtain thewaterborne polyurethane material. The synthetic method of the invention is simple and easy to realize and the synthetic waterborne polyurethane can be used in the fields of coatings, bonding adhesives and elastomeric materials.

Description

Technical field [0001] The invention relates to an aqueous polyurethane and a synthesis method thereof, and belongs to the technical field of polymer chemistry and polymer material science. Background technique [0002] Polyurethane is a high-performance resin. More than 95% of them contain a large amount of solvents, such as toluene and dimethylformamide, which will cause environmental pollution. As the world pays more and more attention to environmental protection, the production of polyurethane has undergone great changes in recent years. The original high-polluting solvent-based polyurethane has been transformed into low-polluting water-based polyurethane. [0003] At present, the application of water-based polyurethane is concentrated in two areas of coatings and adhesives, such as wood coatings, adhesives, glass coatings, leather coatings, etc., and it exists in the form of water-based emulsions. In terms of waterborne polyurethane emulsion coatings, Wicks et al. invented a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F293/00C08G18/65C08G18/66
Inventor 江贵长庹新林王晓工
Owner TSINGHUA UNIV
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