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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: 2009-04-15
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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  • Production of lignin modified water polyurethane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A preparation method for lignin modified waterborne polyurethane, it comprises the steps:

[0020] 1). Mix the calculated amount of polyoxypropylene diol (molecular weight 2000, Nanjing Zhongshan Petrochemical) and toluene diisocyanate (TDI, China Pharmaceutical Group Shanghai Chemical Reagent Company) and stir at 65°C for 2 hours to obtain water-based polyurethane prepolymerization The mass percent of polyoxypropylene diol and toluene diisocyanate is: polyoxypropylene diol 10, toluene diisocyanate 90;

[0021] 2). Add a small molecule chain extender to the water-based polyurethane prepolymer obtained in step 1) at 75°C: 2,2'-dimethylol propionic acid (DMPA, Huzhou Changsheng), small molecule chain extender The amount of DMPA added is 10% of the mass of toluene diisocyanate [so that the NCO / OH molar ratio of the obtained lignosulfonate composite water-based polyurethane emulsion is 1.0-3.5, [-OH] in the small molecule chain extender and polyoxygen In propylene glycol, ...

Embodiment 2

[0028] It is basically the same as Example 1, except that the lignosulfonate added is 6.0% of the solid mass of polyoxypropylene diol, toluene diisocyanate and 2,2'-dimethylol propionic acid to obtain lignin Modified water-based polyurethane (or lignosulfonate composite water-based polyurethane emulsion). The mechanical properties of the material obtained after the same test: the tensile strength is 22.9MPa, and 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

[0030] A kind of preparation method of lignin modified waterborne polyurethane, it comprises the steps:

[0031] 1). Mix the calculated amount of polyoxypropylene diol (molecular weight 2000) with toluene diisocyanate (TDI) and stir at 65°C for 2 hours to obtain a water-based polyurethane prepolymer; the mass of polyoxypropylene diol and toluene diisocyanate The percentage is: polyoxypropylene diol 35, toluene diisocyanate 65;

[0032] 2). Add small molecule chain extender to the aqueous polyurethane prepolymer obtained in step 1) at 75°C: 2,2'-dimethylol propionic acid (DMPA, Huzhou Changsheng), small molecule chain extender DMPA The addition amount is 50% of the toluene diisocyanate quality (making the NCO / OH molar ratio in the obtained lignosulfonate composite aqueous polyurethane emulsion be 1.0-3.5, [-OH] and polyoxypropylene diisocyanate in the small molecule chain extender [-OH] molar ratio in the alcohol is within the scope of 1.0-3.5), stirred and reacted for 1 hour,...

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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 water-based polyurethane, which belongs to the field of natural polymer materials and also belongs to the field of environment-friendly ecological materials. Background technique [0002] Lignin is the second most abundant natural polymer after cellulose in the plant kingdom. Industrial lignin comes from papermaking black liquor, so it has the advantages of cheap, renewable and environmentally friendly. The complexity of lignin structure, the diversity of sources and the diversity of extraction processes make development and utilization difficult and hinder industrialization. Therefore, research and development of lignin polymer materials are facing great opportunities and challenges, and it is urgent to strengthen the research on lignin high Understanding of molecular materials, and exploring new ideas for the development of lignin-based polymer materials. At present, due to the increasing sho...

Claims

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Application Information

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Patent Type & Authority Patents(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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