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Waterborne polyurethane emulsion with high solid content and preparation method thereof

A water-based polyurethane, high solid content technology, applied in leather edge trimming, small raw hide/large raw hide/leather/fur mechanical treatment, small raw hide/large raw hide/leather/fur treatment, etc. High reaction temperature, long time and other problems, to achieve the effect of ensuring stability

Pending Publication Date: 2022-01-28
山西省应用化学研究所(有限公司) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned preparation of high-solid-content water-based polyurethane emulsion uses many types of raw materials, and the reaction temperature is high and the time is long, which may cause the actual application cost of water-based polyurethane to increase. High-temperature reactions will increase energy consumption to a certain extent. require a large investment

Method used

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Examples

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Effect test

preparation example Construction

[0024] A typical embodiment of the present invention provides a method for preparing an aqueous polyurethane emulsion with a high solid content, which includes the following steps.

[0025] Step 1, synthesizing a water-based polyurethane emulsion A with low solid content and small particle size;

[0026] Step 2, synthesizing polyurethane prepolymer;

[0027] Step 3, adding the polyurethane prepolymer obtained in step 2 to the aqueous polyurethane emulsion A obtained in step 1 of high-speed stirring to obtain aqueous polyurethane emulsion B with high solid content.

[0028] In the above step 1, in terms of parts by mass, the raw materials for synthesizing the water-based polyurethane emulsion A include 160-240 parts of soft segment diols, 9.2-15.12 parts of carboxyl-containing hydrophilic monomers, 41.8-66.68 parts of diisocyanates, and Molecular diol chain extender 2.48-3.72 parts, N,N-dimethylformamide 8-10 parts, acetone 40-60 parts, neutralizer 5.2-8.24 parts and 608-734 p...

Embodiment 1

[0044] Add 200g of polyneopentyl adipate (PNA) to a reaction kettle equipped with a thermometer, agitator and condensing device with a vacuum dehydration device and dehydrate at 100°C and -0.08MPa for 2 hours. Cool neopentyl glycol ester (PNA) to 55°C, add 11.4g of dimethylolpropionic acid (DMPA), 52.2g of toluene diisocyanate (TDI), 10g of N,N-dimethylformamide, in Keep warm at 65°C for 1 hour, and add 10g of acetone to adjust the viscosity; add 3.1g of propylene glycol, keep warm at 65°C for 1h, and add 10g of acetone to adjust the viscosity; when the isocyanate content in the reactant reaches the theoretical value of 2.36%, cool down to 50°C, Add 6.88g of triethylamine for salinization for 20min, and add 30g of acetone to adjust the viscosity; cool down to 30°C, add 578g of deionized water to emulsify and disperse under high-speed stirring; disperse 1.2g of ethylenediamine in 30g of deionized Ionized water, and slowly and uniformly added dropwise to the emulsion obtained ab...

Embodiment 2

[0048] Add 160g of poly-1,4-butylene adipate (PBA) to a reaction kettle with a vacuum dehydration device equipped with a thermometer, a stirrer and a condensation device, and dehydrate at 110°C and -0.08MPa for 2h. Cool the above poly-1,4-butylene adipate (PBA) to 50°C, add 9.2g of dimethylolpropionic acid (DMPA), 41.8g of toluene diisocyanate (TDI), 8g of N, N -Dimethylformamide, keep warm at 70°C for 1h, and add 10g of acetone to adjust the viscosity; add 2.48g of propylene glycol, keep warm at 70°C for 1h, and add 10g of acetone to adjust the viscosity; when the isocyanate content in the reactant reaches the theoretical value 2.09% and lower the temperature to 55°C, add 5.2g of triethylamine for salinization for 20min, and add 20g of acetone to adjust the viscosity; cool down to 30°C, add 602g of deionized water to emulsify and disperse under high-speed stirring; 1.66g of Diethylenetriamine was dispersed in 30 g of deionized water, and slowly and uniformly added dropwise to...

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Abstract

The invention relates to a waterborne polyurethane emulsion with a high solid content and a preparation method thereof. The preparation method comprises the steps that firstly, a waterborne polyurethane emulsion A and a polyurethane prepolymer which are low in solid content and small in particle size are prepared respectively, the prepared waterborne polyurethane emulsion A is used for replacing water for emulsification, the polyurethane prepolymer is added into the waterborne polyurethane emulsion A which is stirred at a high speed, and the waterborne polyurethane emulsion B with a high solid content is obtained. Through mutual filling of different emulsion particle sizes, maximum accumulation is achieved, the stability of the emulsion is guaranteed, and meanwhile, the solid content of the prepared waterborne polyurethane emulsion is greater than or equal to 55%.

Description

technical field [0001] The invention belongs to the field of aqueous polyurethane emulsion polymerization, in particular to an aqueous polyurethane emulsion with high solid content and wide particle size distribution and a preparation method thereof. Background technique [0002] Water-based polyurethane materials not only have some excellent properties of traditional solvent-based polyurethane materials, but also have the advantages of low VOC emissions, environmental protection, and non-toxicity. CN111875769A discloses a kind of high solid content waterborne polyurethane composite emulsion and its preparation method, by preparing -OH, -NH 2 Or the acrylic emulsion of silane functional group; adopt and comprise polymer diol, diisocyanate, the raw material reaction of hydrophilic chain extender, small molecule chain extender and neutralizing agent prepare the polyurethane prepolymer containing-NCO; Described acrylic acid The emulsion replaces part of the water and is added ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/42C08G18/34C08G18/32C08G18/12C14B11/00
CPCC08G18/6659C08G18/4238C08G18/348C08G18/3206C08G18/3228C08G18/12C14B11/00
Inventor 郝静吴建兵刘伟李萍马小龙梁庆丰程巍王建芬
Owner 山西省应用化学研究所(有限公司)
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