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A kind of preparation method of high solid content low viscosity waterborne polyurethane emulsion

A technology of water-based polyurethane and high solid content, applied in the field of preparation of water-based polyurethane emulsion, can solve problems such as difficulty in increasing the solid content of water-based polyurethane emulsion, and achieve the effects of improving space utilization, high solid content and good storage stability

Active Publication Date: 2021-07-30
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the deficiency that the solid content of water-based polyurethane emulsion prepared by common internal emulsification method is difficult to increase, and to provide a simple method for preparing water-based polyurethane emulsion with high solid content and low viscosity

Method used

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  • A kind of preparation method of high solid content low viscosity waterborne polyurethane emulsion
  • A kind of preparation method of high solid content low viscosity waterborne polyurethane emulsion
  • A kind of preparation method of high solid content low viscosity waterborne polyurethane emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Get 1.52g dimethylolpropionic acid (DMPA), 20g polypropylene glycol (PPG, ), 0.55g 1,4-butanediol (BDO) and mix well, heat up to 80°C, add 13.34g isophorone diisocyanate (IPDI), dropwise add 0.04g catalyst dibutyltin dilaurate (T-12) , kept at 80°C for about 4 hours, stopped heating and added 12ml of acetone to dilute, lowered the temperature to 30°C, added 1.50g of neutralizing agent triethylamine (TEA), and reacted for 30min to obtain the first prepolymer. Under stirring at 800r / min, add 89ml of water to the first prepolymer, and then add 1.35g of ethylenediamine (EDA), after chain extension reaction and emulsification for 1 hour, the solvent acetone is removed by rotary evaporation, and a small particle size water-based polyurethane emulsion is prepared. WPU-S.

[0034] figure 1 The particle size distribution diagram of WPU-S prepared above is given. It can be seen that WPU-S presents a unimodal distribution, and its average particle size is 43nm. After testing, ...

Embodiment 2

[0038] Take 0.75g DMPA, 20gPPG ( ), 1.10g of BDO, mixed evenly, heated up to 80°C, added 11.67g of IPDI, added dropwise 0.04g of T-12, kept at 80°C for about 4 hours, stopped heating and added 11ml of acetone to dilute, cooled to 30°C, added 0.53g of TEA, The reaction was carried out for 30 minutes to obtain the second prepolymer. Under stirring at 800r / min, add 26ml of water and 23g of the water-based polyurethane emulsion WPU-S prepared in Example 1 dropwise to the second prepolymer, then add 0.90g of EDA, perform chain extension reaction and emulsify for 1 hour, and then remove it by rotary evaporation. The solvent acetone was used to prepare high solid content and low viscosity waterborne polyurethane emulsion WPU-H2.

[0039] image 3 The particle size distribution diagram of WPU-H2 prepared above is given. Because the relative molecular weight of the second prepolymer is relatively small and the viscosity is low, although the content of acetone added is less than tha...

Embodiment 3

[0041] Take 0.66g DMPA, 20gPPG ( ), 1.13g of BDO, mixed evenly, heated up to 80°C, added 10.00g of IPDI, added dropwise 0.04g of T-12, kept at 80°C for about 4 hours, stopped heating and added 11ml of acetone to dilute, cooled to 30°C, added 0.51g of TEA, The reaction was carried out for 30 minutes to obtain the second prepolymer. Under stirring at 800r / min, add 24.2ml of water and 22g of the water-based polyurethane emulsion WPU-S prepared in Example 1 dropwise to the second prepolymer, then add 0.45g of EDA, chain extension reaction and emulsification for 1h, then rotary steam The solvent acetone was removed to prepare high solid content and low viscosity waterborne polyurethane emulsion WPU-H3.

[0042] Figure 4 The particle size distribution diagram of WPU-H3 prepared above is given. Compared with Example 2, the relative molecular weight of the prepared second prepolymer is larger, but the content of acetone added is the same, so the viscosity of the system is larger,...

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Abstract

The invention discloses a method for preparing a water-based polyurethane emulsion with high solid content and low viscosity. The first step is to prepare the first polyether or polyester diol, isocyanate, lipophilic chain extender and hydrophilic chain extender as raw materials. Prepolymer, after emulsification with water and chain extension reaction, a small particle size water-based polyurethane emulsion with low solid content and small particle size is obtained; then follow the method for preparing the first prepolymer to reduce hydrophilic chain extension The second prepolymer was prepared according to the dosage of the agent, emulsified by adding water, and added to the small particle size water-based polyurethane emulsion, followed by chain extension reaction to prepare a high-solid content and low-viscosity water-based polyurethane emulsion. The method of the invention is not limited by raw materials, and the prepared aqueous polyurethane emulsion has high solid content and low viscosity.

Description

technical field [0001] The invention belongs to the technical field of water-based polyurethane preparation, and relates to a preparation method of water-based polyurethane emulsion with relatively high solid content and relatively low viscosity. Background technique [0002] Waterborne polyurethane (WPU) is not only superior in performance, but also environmentally friendly. In recent years, in the fields of adhesives, coatings, inks, etc., water-based polyurethane is gradually replacing solvent-based polyurethane. [0003] However, since the heat of evaporation of water is higher than that of commonly used organic solvents, the water in water-based polyurethane evaporates slower than the solvent in solvent-based polyurethane under the same solid content, and the drying time is longer, which is difficult to meet the high efficiency requirements of modern production lines. [0004] In addition, waterborne polyurethane still has many shortcomings in practical applications, s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/34C08G18/32C08G18/12
CPCC08G18/12C08G18/3206C08G18/3228C08G18/348C08G18/48C08G18/6692
Inventor 王香梅李倩
Owner ZHONGBEI UNIV
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