Thermosetting lignin-based polyurethane elastomer suitable for cyclic processing and preparation method thereof

A polyurethane elastomer and lignin-based technology, which is applied in the field of polyurethane elastomer, can solve the problems of high crosslinking degree of polyurethane elastomer, inability to be processed and utilized for multiple times, and inability to be recycled, so as to achieve good anti-ultraviolet radiation and anti-aging Aging performance, excellent anti-ultraviolet radiation and anti-aging function, effect of excellent anti-ultraviolet radiation and anti-aging performance

Pending Publication Date: 2019-03-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The prepared material has improved strength and elasticity, but the synthesized elastomer is a thermoset material and lacks cycleability
[0005] At present, the reported lignin-based polyurethane elastomers are all thermosetting materials, which cannot be recycled
Due to the high hydroxyl value of lignin, the synthetic polyurethane elastomer has a high degree of crosslinking, so it cannot be processed and utilized multiple times.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Mass by volume, g / mL

[0040] (1) Dissolving 300 parts by mass of enzymatically hydrolyzed lignin in a 2 mol / L sodium hydroxide solution to prepare a 10 wt% enzymatically hydrolyzed lignin solution. Under the condition of 155℃, 0.6MPa, cook for 8h. After the reaction, hydrochloric acid was added to adjust the pH value of the solution to 3, and then the precipitate was washed with water to neutrality to obtain partially depolymerized enzymatic-hydrolyzed lignin.

[0041] (2) 9 parts by mass of polytetramethylene ether glycol 2000 were heated to 120°C, vacuumed (vacuum degree <100Pa) and dehydrated for 2h, then cooled to 70°C, and 10 parts by volume of dimethylacetamide solution was added, 0.03 parts by mass of dibutyltin dilaurate, and stir evenly. Then, 1.86 parts by mass of hexamethylene diisocyanate was added, and the reaction was carried out at 70° C. for 2 h. After the reaction was completed, 1.32 parts by mass of bis(4-hydroxyphenyl) disulfide was added, and the...

Embodiment 2

[0044] Step (1) is the same as in Example 1.

[0045]Step (2) is as follows: heat 8 parts by mass of polytetramethylene ether glycol 2000 to 120° C., vacuumize (vacuum degree <100Pa) for dehydration for 2 hours, then cool to 70° C., add 10 parts by volume of dimethyl ethyl acetate. The amide solution, 0.03 parts by mass of dibutyltin dilaurate, was stirred uniformly. Then 1.8 g of hexamethylene diisocyanate was added, and the reaction was carried out at 70° C. for 2 h. After the reaction was completed, 1.32 parts by mass of bis(4-hydroxyphenyl) disulfide was added, and the reaction was continued for 1.5 h. Finally, 2 parts by mass of depolymerized enzymatic-hydrolyzed lignin was added, and the reaction was kept at 70 °C for 4 h. After the reaction, the product was poured out, and the solvent was removed by vacuum drying at 70 °C for 24 h. Put it into a flat vulcanizer, and press it under the conditions of 160°C and 10MPa for 5 minutes to obtain a lignin-based polyurethane e...

Embodiment 3

[0048] Step (1) is the same as in Example 1.

[0049] Step (2) is as follows: 7 parts by mass of polytetramethylene ether glycol 2000 is heated to 120° C., vacuumized (vacuum degree <100Pa) and dehydrated for 2 h, then cooled to 70° C., and 10 parts by mass of dimethyl ethyl acetate are added. The amide solution, 0.03 parts by mass of dibutyltin dilaurate, was stirred uniformly. Then, 1.83 parts by mass of hexamethylene diisocyanate was added, and the reaction was carried out at 70° C. for 2 h. After the reaction was completed, 1.32 parts by mass of bis(4-hydroxyphenyl) disulfide was added, and the reaction was continued for 1.5 h. Finally, 3 parts by mass of depolymerized enzymatic lignin was added, and the reaction was kept at 70 °C for 4 h. After the reaction, the product was poured out, and the solvent was removed by vacuum drying at 70 °C for 24 h. Put it into a flat vulcanizer, and press it under the conditions of 160°C and 10MPa for 5 minutes to obtain a lignin-based...

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Abstract

The invention belongs to the technical field of polyurethane elastomers and discloses thermosetting lignin-based polyurethane elastomer suitable for cyclic processing and a preparation method thereof.The thermosetting lignin-based polyurethane elastomer is made from partially-depolymerized lignin reacting with polyurethane prepolymer; the partially-depolymerized lignin is prepared by dissolving lignin in an alkaline liquid, boiling under the concentration of 1-30% by weight, 140-280 DEG C and 0.4-2.0 MPa, and depolymerizing. The partially-depolymerized lignin is used herein to prepare the polyurethane elastomer which is better compatible with polyurethane matrix; reinforcement effect is provided; good ultraviolet resistance and aging resistance are imparted to the polyurethane elastomer;the problem that traditional lignin-based polyurethane elastomer is unsuitable for multiple cyclic processing is solved; after being processed many times, the elastomer herein has substantially unchanged performance.

Description

technical field [0001] The invention belongs to the technical field of polyurethane elastomers, and particularly relates to a cyclically processable thermosetting lignin-based polyurethane elastomer and a preparation method thereof. Background technique [0002] Polyurethane elastomers are widely used in many fields such as shoe materials, cables, auto parts, medical equipment, etc. because of their excellent physical and chemical properties, such as high strength, chemical corrosion resistance, high and low temperature resistance, and easy processing. The main raw materials for synthesizing polyurethane are isocyanates and polyols. At present, the polyols used for synthesizing polyurethane mainly come from fossil resources such as petroleum. Due to the shortage of petroleum resources and the increasingly serious environmental pollution, finding renewable resources to replace petrochemical polyols has become the key to the sustainable development of polyurethane materials. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/64C08G18/48C08G18/32C08G18/66C08G18/73C08G18/76C08H7/00
CPCC08G18/3215C08G18/4081C08G18/4854C08G18/6492C08G18/6674C08G18/73C08G18/7671C08H6/00
Inventor 邱学青刘伟峰王圣谕杨东杰黄锦浩楼宏铭
Owner SOUTH CHINA UNIV OF TECH
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