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Synthesis method and application of waterborne polyurethane for microfiber impregnation

A technology of water-based polyurethane and synthesis method, which is applied in the direction of textiles and papermaking, can solve the problems of insufficient softness, poor temperature resistance, easy hydrolysis, etc., and achieve the effect of good resilience and soft hand feeling

Inactive Publication Date: 2020-11-10
明新梅诺卡(江苏)新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although there are many kinds of polyurethanes used for coatings and their performances are relatively complete, most of them are solvent-based systems, which will have a certain impact on the environment and personnel during production and use.
In recent years, with the improvement of environmental protection requirements, water-based polyurethane has been developed rapidly. Although it can replace solvent-based polyurethane in some aspects, whether it is polyether type, polyester type or polycarbon type water-based polyurethane is used in many In terms of performance, it is still not up to the performance of solvent-based polyurethane, especially in the aspect of superfiber impregnation, especially in high temperature resistance, alkali resistance, yellowing resistance, UV resistance, resilience, etc., compared with solvent Type polyurethane is very different, which limits the development of water-based microfiber
[0004] At present, no matter the water-based polyurethane synthesized is polyether type, polyester type or polycarbon type, it will have disadvantages such as easy hydrolysis, no alkali resistance, not enough softness, poor rebound, poor temperature resistance, and poor UV resistance during use.
It can't reach the performance of solvent-based polyurethane at all, and it is difficult to apply to water-based superfiber

Method used

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  • Synthesis method and application of waterborne polyurethane for microfiber impregnation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] (1) First, add 100g polytetrahydrofuran ether glycol (PTMG2000) and 150g polypropylene glycol (PPG3000) to a 1000ml four-necked flask with electric stirring, thermometer, constant pressure funnel and vacuum pump, then turn on the electric stirrer, oil bath , Vacuum pump, start timing when the thermometer on the four-necked flask reaches 110°C, vacuum pressure ≤ -0.08MPa, keep the temperature at 110°C ~ 120°C, and vacuum dehydration for 3 hours under the conditions of pressure ≤ -0.08MPa.

[0055] (2) When the water content in the polyol is less than 0.05%, turn off the vacuum pump and reduce the temperature of the oil bath. When the temperature of the thermometer drops to 75°C, slowly add 77.8g of isophorone diisocyanate through the constant pressure funnel. Stir evenly, start to heat up, when the temperature reaches 90°C, start timing, and react at constant temperature for 1 hour. The -NCO content in the mixture was determined to reach the design value by titration. T...

Embodiment 2

[0060] (1) First, 100g polytetrahydrofuran ether glycol (PTMG2000), 100g polypropylene glycol (PPG3000) and 50g polypropylene glycol (PPG4000) were added to a 1000ml four-necked flask with electric stirring, thermometer, constant pressure funnel and vacuum pump, and then opened Electric stirrer, oil bath, vacuum pump, start timing when the thermometer on the four-necked flask reaches 110°C, vacuum pressure ≤ -0.08MPa, keep the temperature at 110°C ~ 120°C, and vacuum dehydration for 3 hours under the condition of pressure ≤ -0.08MPa .

[0061] (2) When the water content in the polyol is less than 0.05%, turn off the vacuum pump, reduce the temperature of the oil bath, and when the temperature of the thermometer drops to 75°C, slowly add 42.6g of isophorone diisocyanate and 32.2g of six After the addition of methylene diisocyanate, stir evenly, start to heat up, when the temperature reaches 90°C, start timing, and react at constant temperature for 1h. The -NCO content in the m...

Embodiment 3

[0066] (1) First, 150g polytetrahydrofuran ether glycol (PTMG2000), 100g polypropylene glycol (PPG3000) and 50g polypropylene glycol (PPG4000) were added to a 1000ml four-necked flask with electric stirring, thermometer, constant pressure funnel and vacuum pump, and then opened Electric stirrer, oil bath, vacuum pump, start timing when the thermometer on the four-necked flask reaches 110°C, vacuum pressure ≤ -0.08MPa, keep the temperature at 110°C ~ 120°C, and vacuum dehydration for 3 hours under the condition of pressure ≤ -0.08MPa .

[0067](2) When the water content in the polyol is less than 0.05%, turn off the vacuum pump and lower the temperature of the oil bath. When the temperature of the thermometer drops to 75°C, slowly add 72.22g of isophorone diisocyanate through the constant pressure funnel. Stir evenly, start to heat up, when the temperature reaches 90°C, start timing, and react at constant temperature for 1 hour. The -NCO content in the mixture was determined t...

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Abstract

The invention discloses a synthesis method of waterborne polyurethane for microfiber impregnation, which comprises the following steps: 1) carrying out vacuum drying on alkali-resistant dihydric alcohol for 2-4 hours until the water content is lower than 0.05%; 2) uniformly mixing the alkali-resistant polyol with aliphatic isocyanate, heating to 60-90 DEG C, and reacting for 1-2 hours; then addinga hydrophilic chain extender and a chain extender, uniformly mixing, reacting for 2-4 hours at the temperature of 60-90 DEG C, then adding an antioxidant and an ultraviolet light absorber, and uniformly stirring to obtain a waterborne polyurethane prepolymer; 3) neutralizing the waterborne polyurethane prepolymer with a neutralizer, and then adding deionized water for high-speed dispersion and emulsification to obtain an emulsion; and 4) carrying out a chain extension reaction on the emulsion and a post-chain extender again to obtain the waterborne polyurethane for microfiber impregnation. According to the synthesis method, the polyurethane resin is modified to achieve high-temperature resistance and ultraviolet resistance, and the waterborne microfiber with excellent performance in all aspects can be obtained when the polyurethane resin is used in microfiber.

Description

technical field [0001] The invention relates to the technical field of polyurethane synthesis, in particular to a synthesis method and application of superfiber impregnated with water-based polyurethane. Background technique [0002] Polyurethane is a general term for polymer compounds containing carbamate groups (-NH-COO-) in the main chain formed by the polyaddition reaction of polyols and isocyanates. Due to its high strength, high wear resistance, high resilience and Solvent resistance and other characteristics have been widely used in various aspects such as coatings, adhesives, thermal insulation materials, coatings, and elastomers. [0003] Although there are many kinds of polyurethanes used for coating and their performances are relatively complete, most of them are solvent-based systems, which will have certain impacts on the environment and personnel during production and use. In recent years, with the improvement of environmental protection requirements, water-ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/73C08G18/66C08G18/48C08G18/32C08G18/34C08G18/12D06N3/14
CPCC08G18/755C08G18/73C08G18/722C08G18/4808C08G18/4854C08G18/4825C08G18/12D06N3/146D06N3/147D06N2209/067D06N2209/1678D06N2211/28
Inventor 庄君新樊文武宋兵
Owner 明新梅诺卡(江苏)新材料有限公司
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