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Production of lignin modified water polyurethane

A water-based polyurethane and lignin technology, which is applied in the direction of lignin derivatives, chemical instruments and methods, organic chemistry, etc., can solve the problems of complex preparation process and decline of modification technology, and achieve low production cost, abundant sources, stretchable high intensity effect

Inactive Publication Date: 2007-04-04
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research on lignin modified materials mainly focuses on the influence of certain aspects of the primary and secondary structures of lignin and its derivatives, such as functional groups, star structure, molecular weight, and spherical conformation, on the macroscopic properties. There are few studies on the influence of supramolecular aggregates and network structures participated by lignin on the properties of materials and the control of structures, and only a few reports involve
[0003] The elongation at break and the tensile strength of the modified water-based polyurethane obtained by the preparation method of the existing modified water-based polyurethane (or water-based polyurethane material) need to be further improved, and most of the current methods of modifying the water-based polyurethane can only be unilateral Improve the elongation at break or tensile strength of the material (Japanese patent: 5186543.1993), even while improving one aspect, it usually leads to a decrease in the other (Chinese patent: 93110541), or the modification technology used is complex in the preparation process (USA Patent: 5173526.1992)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method of lignin-modified waterborne polyurethane, which comprises the following steps:

[0025] 1). Mix the calculated amount of polyoxypropylene glycol (molecular weight 2000, Nanjing Zhongshan Petrochemical) and toluene diisocyanate (TDI, China Pharmaceutical Group Shanghai Chemical Reagent Company) at 65°C and stir for 2 hours to obtain the waterborne polyurethane prepolymer The mass percentage of polyoxypropylene glycol and toluene diisocyanate is: polyoxypropylene glycol 10 and toluene diisocyanate 90;

[0026] 2). Add a small molecule chain extender to the waterborne polyurethane prepolymer obtained in step 1) at 75°C: 2,2'-dimethylolpropionic acid (DMPA, Huzhou Changsheng), a small molecule chain extender The amount of DMPA added is 10% of the mass of toluene diisocyanate [so that the molar ratio of NCO / OH in the resulting lignosulfonate composite water-based polyurethane emulsion is 1.0-3.5, and the [-OH] in the small molecule chain extender is combin...

Embodiment 2

[0033]It is basically the same as Example 1, except that the added lignosulfonate is 6.0% of the solid mass of polyoxypropylene glycol, toluene diisocyanate and 2,2'-dimethylolpropionic acid to obtain lignin Modified waterborne polyurethane (or lignosulfonate composite waterborne polyurethane emulsion). The mechanical properties of the material obtained after the same test: the tensile strength is 22.9MPa, the elongation at break is 906.97%, compared with the blank material, the tensile strength is increased by 2.1 times, but the elongation at break is reduced to the original 86%.

Embodiment 3

[0035] A preparation method of lignin-modified waterborne polyurethane, which comprises the following steps:

[0036] 1). Mix the calculated amount of polyoxypropylene glycol (molecular weight 2000) and toluene diisocyanate (TDI) for 2 hours at 65°C to obtain the waterborne polyurethane prepolymer; the mass of polyoxypropylene glycol and toluene diisocyanate The percentages are: polyoxypropylene glycol 35, toluene diisocyanate 65;

[0037] 2). At 75℃ to the small molecule chain extender of the waterborne polyurethane prepolymer obtained in step 1): 2,2'-dimethylolpropionic acid (DMPA, Huzhou Changsheng), the small molecule chain extender DMPA The added amount is 50% of the mass of toluene diisocyanate (so that the molar ratio of NCO / OH in the resulting lignosulfonate composite waterborne polyurethane emulsion is 1.0-3.5, and the [-OH] and polyoxypropylene two The molar ratio of [-OH] in the alcohol is within the range of 1.0-3.5), stir and react for 1 hour, during which time the v...

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Abstract

Production of lignin modified water polyurethane is carried out by adding into lignin while synthesizing water polyurethane emulsifier and obtaining the final product. The lignin consists of polyisocyanate, polyether polyhydric alcohol or polyester polyhydric alcohol and multifunctional-based small-molecular chain extender containing carboxy and hydrophilic group. It's simple, cheap, and degradable and has better extension rate at break and stretch strength and no environmental pollution. It can be used for coating and adhesion agent.

Description

Technical field [0001] The invention relates to a preparation method of modified waterborne polyurethane, which belongs to the field of natural polymer materials and also belongs to the field of environmentally friendly ecological materials. Background technique [0002] Lignin (lignin) is the second most abundant natural polymer in the plant kingdom after cellulose. Industrial lignin is derived from papermaking black liquor, so it has the advantages of low price, renewable, and environmental friendliness. The complexity of the structure of lignin, the diversity of sources and the diversity of the extraction process make the development and utilization difficult and hinder industrialization. Therefore, the research and development of lignin polymer materials is facing huge opportunities and challenges, and there is an urgent need to strengthen the Understand molecular materials and explore new ideas for the development of lignin-based polymer materials. At present, due to the inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/83C08G18/10C08G18/48C07G1/00C08H7/00
Inventor 黄进崔国娟魏铭夏文兵郑化
Owner WUHAN UNIV OF TECH
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