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Lignin-based polyurethane chain extender as well as preparation method and application thereof
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A lignin-based and polyurethane technology, applied in the direction of biological raw materials, can solve the problem of browning, etc., and achieve the effect of simple operation, reduced dependence, and enhanced thermal stability
Active Publication Date: 2021-11-19
NANJING UNIV OF TECH
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However, the disadvantage of this chain extender is that it turns brown after melting, and is only suitable for the preparation of dark high-performance PUR products.
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[0072] Accurately weigh 4-methylphenol (21.6 g, 0.2 mol), 40% formaldehyde solution (9.0 g, 0.12 mol) and p-toluenesulfonic acid (1.72 g, 0.01 mol) in the pressure resistant bottle, 60 ° C water bath heating After stirring for 30 minutes, the reaction was diluted with ethyl acetate, water and ethyl acetate were extracted, dried off in anhydroussulfate, and the organic phase was concentrated, and the viscous oil liquid (Compound IIIA) was obtained, and the yield was 80.3%. MSI-MS: 229.3 [M + H] + .
[0073] IVA 2,2 '- (((methylene (4-methyl-2,1-phenyl)) bis ((oxygen)) double acetamide
[0092] Referring to I-1 synthesis, the yield is 97.6%. MSI-MS: 287.3 [M + H] + .
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Abstract
The invention discloses a lignin-based polyurethane chain extender as well as a preparation method and an application thereof, methylenediphenylamine of the lignin-based polyurethane chain extender is shown as a formula I. The preparation method comprises the following steps: carrying out a hydroxyalkylation reaction on a lignincrackingmonomer compound II and a carbonyl compound to obtain a compound III; performing an ammonification reaction on the compound III and chloroacetamide to obtain a compound IV, and performing a Smiles rearrangement reaction on the compound IV to obtain the lignin-based polyurethane chain extendermethylenediphenylamine shown in the formula I. According to the invention, green and sustainable lignin is used as a raw material, the carcinogenic potential risk of 2-chloroaniline as a raw material required for producing MOCA is avoided, the dependence on fossil resources is reduced, and the product as a chain extender enhances the thermal stability, mechanical properties and aging resistance of a polyurethane material.
Description
Technical field [0001] The present invention belongs to the field of biological high molecular material, and more particularly to a lignin-based polyurethane chain extender and a preparation method thereof. Background technique [0002] Lignin is widely present in nature, in all higher plants, together with cellulose and hemicellulose, forming the main ingredients of the plant skeleton, and bonded fibers and a double role that makes fibers. In nature, the annual output of lignin is very rich, the second bit is second only to cellulose. Affected by the biosynthesis process, lignin molecules are unlike a duplicate structural unit with cellulose, the chemical structure is very complicated. It is generally recognized that it is a three-dimensional mesh structure of three phenylene cells through ether bonds and carbon bonds, which are censorstrum propylene (G), purple Climbyl propane (S type) and a hydroxyphenylpropane (H type) structural unit. Lignin molecules have a variety of funct...
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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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