Waterborne polyurethane resin with high solid content and synthesis method thereof

A technology of water-based polyurethane and resin, which is applied in the field of high-solid-content water-based polyurethane resin emulsion and its preparation, can solve problems such as complex process and cumbersome operation, and achieve the effects of simplified synthesis process, simple production process and reduced equipment requirements

Inactive Publication Date: 2013-12-18
SHANDONG TIANQING TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN103073876A "A Preparation Method for Aromatic High-Solid Water-Based Polyurethane" discloses a legal formula for obtaining a composite emulsion by dispersing an end-blocked polyurethane prepolymer into a water-based polyurethane containing active end groups. The process is more complicated and the operation is cumbersome

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Raw material formula ratio adopts the lower limit value, the formula is as follows (unit: kg):

[0029] Polycaprolactone diol (number average molecular weight 2000): 100

[0030] Polytetrahydrofuran diol (number average molecular weight: 2000): 50

[0031] Toluene diisocyanate: 30

[0032] Stannous octoate: 0.01

[0033] Dimethylolpropionic acid: 9

[0034] Trimethylolpropane: 4

[0035] NMP: 15

[0036] Acetone: 20

[0037] Triethylamine: 6

[0038] Deionized water: 180

[0039] Preparation Process:

[0040] 1. Preparation of prepolymer: Add polyester diol, polytetrahydrofuran diol and toluene diisocyanate after vacuum dehydration into the reaction vessel, stir well, add stannous octoate, and react for 1 hour under mechanical stirring at a temperature of 80°C . Cool down to 65°C, add dimethylolpropionic acid and trimethylolpropane dissolved in NMP, and react for 1.5 hours at 80°C under mechanical stirring.

[0041] 2. Neutralization reaction: Cool the above ...

Embodiment 2

[0045] Raw material formula ratio adopts the upper limit value, the formula is as follows (unit: kg):

[0046] Polyadipate type polyester diol (number average molecular weight 3000): 100

[0047] Isophorone diisocyanate: 60

[0048] Stannous octoate: 0.04

[0049] Dimethylolpropionic acid: 20

[0050] Trimethylolpropane: 8

[0051] 1,4-Butanediol: 2

[0052] NMP: 18

[0053] Acetone: 40

[0054] Triethylamine: 15

[0055] Deionized water: 280

[0056] Preparation Process:

[0057] 1. Preparation of prepolymer: Add vacuum dehydrated polyester diol and isophorone diisocyanate into the reaction vessel, stir well, add stannous octoate, and react for 2 hours at 90°C under mechanical stirring. Cool down to 65°C, add dimethylolpropionic acid, trimethylolpropane, and 1,4-butanediol dissolved in NMP, and react for 3.5 hours at a temperature of 90°C under mechanical stirring.

[0058] 2. Neutralization reaction: Cool the above prepolymer to 50°C, add triethylamine and acetone,...

Embodiment 3

[0062] The formula ratio of raw materials adopts the intermediate value, and the formula is as follows (unit: kg):

[0063] Polycaprolactone diol (number average molecular weight 2000): 30

[0064] Polytetrahydrofuran diol (number average molecular weight: 1000): 70

[0065] Diphenylmethane diisocyanate: 45

[0066] Dibutyltin dilaurate: 0.03

[0067] Dimethylolbutyrate: 12

[0068] Neopentyl glycol: 3

[0069] NMP: 15

[0070] Acetone: 24

[0071] Triethylamine: 9

[0072]Deionized water: 186

[0073] Preparation Process:

[0074] 1. Preparation of prepolymer: Add polycaprolactone diol, polytetrahydrofuran diol and diphenylmethane diisocyanate after vacuum dehydration into the reaction vessel, stir well and add dibutyltin dilaurate, under mechanical stirring, The temperature was 88°C, and the reaction was carried out for 2.5 hours. Cool down to 65°C, add dimethylol butyric acid and neopentyl glycol dissolved in NMP, and react at 80°C under mechanical stirring for 4 ...

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Abstract

The invention claims a waterborne polyurethane resin with high solid content and a synthesis method thereof. The polyurethane resin is prepared mainly by polyol, diisocyanate, a catalyst, a hydrophilic chain extender and a polyol chain extender. The method comprises the following steps: firstly preparing a polyurethane prepolymer, then neutralizing and finally preparing waterborne polyurethane. According to the method, the waterborne material is adopted to replace the organic solvent material so as to eliminate the environmental pollution and resource waste caused by the organic solvent from the source; the volatile organic solvent (VOC) is low in content to obviously improve the employment environment of workers, satisfy EU ecological requirements of synthetic leather, facilitate the sustainable development of the industry and improve the international market competitiveness of the synthetic leather. The preparation technology provided in the invention can be used for reducing the difficulty of the prepolymer reaction and dispersion processes and simplifying the synthesis processes, and has low requirements on equipment and simple production process. The preparation technology provided by the invention can be used for well controlling the structure of a polyurethane molecular chain so as to endow the waterborne polyurethane with excellent mechanical properties.

Description

technical field [0001] The invention belongs to the field of polymer material synthesis, and in particular relates to a high-solid-content aqueous polyurethane resin emulsion and a preparation method thereof. Background technique [0002] The traditional synthetic leather industry generally uses solvent-based PU resin as the surface layer and base material for the production of synthetic leather. Traditional solvent-based polyurethane adhesives and coating products use a large amount of organic solvents, such as dimethylformamide, toluene, xylene, acetone, methyl ethyl ketone, etc. That is to say, it will pollute the environment and cause damage to the health of workers in related industries, and it is flammable and explosive, which can easily cause fire accidents. And the use of organic solvents causes a lot of waste of resources. With the acceleration of market internationalization and the strengthening of people's awareness of environmental protection, these issues have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/42C08G18/34C08G18/32C08G18/12C08L75/06C08L75/08
Inventor 刘娅林刘杰华马福兰闫克辉刘文峰马金明孙海园胡新霞王金明刘晓民
Owner SHANDONG TIANQING TECH DEV
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