A kind of using modified lignin to strengthen rigid polyurethane material and preparation method thereof

A technology of rigid polyurethane and lignin, which is applied in the field of preparation of modified lignin reinforced rigid polyurethane materials, can solve the problems of limited number of hydroxyl groups, unsatisfactory enhancement effect of mechanical properties of polyurethane materials, low degree of reaction, etc., and achieve reactivity Improvement, mechanical properties, and broad application prospects

Active Publication Date: 2019-12-10
南通市裕如工程材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that although ordinary lignin can enhance the mechanical properties of polyurethane materials at present, due to the limited number of hydroxyl groups of lignin itself, the degree of polymerization reaction with isocyanate is not high, resulting in the effect of lignin on the mechanical properties of polyurethane materials. The defect of unsatisfactory reinforcement effect provides a modified lignin reinforced rigid polyurethane material and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0027] Collect papermaking black liquor and mix it with sodium hydroxide at a mass ratio of 10:1, heat and boil for 30 minutes, filter the boiled papermaking black liquor, separate the filtrate, adjust the pH of the filtrate to 4.0 with 2mol / L hydrochloric acid, and let it stand Precipitate for 1h, filter to obtain the precipitate, which is lignin; weigh the lignin and put it into a beaker, then add a 30% sodium silicate solution with a mass fraction of 3 times the lignin mass into the beaker, place the beaker on a shaker, Shaking and impregnating for 3 hours, after the shaking and impregnating, filter and separate to obtain the filter residue, which is the pre-modified lignin; mix the pre-modified lignin and the sodium hydroxide solution with a mass fraction of 5% in a mass ratio of 1:5, at 60 Stir and dissolve at ℃ for 2 hours to obtain a pre-modified lignin solution, add 3% sodium borohydride of pre-modified lignin mass to the pre-modified lignin solution, stir evenly to obt...

example 2

[0029]Collect papermaking black liquor and mix it with sodium hydroxide at a mass ratio of 10:1, heat and boil for 35 minutes, filter the boiled papermaking black liquor, separate the filtrate, adjust the pH of the filtrate to 4.3 with 2mol / L hydrochloric acid, and let it stand Precipitate for 2 hours, filter to obtain the precipitate, which is lignin; weigh the lignin and put it into a beaker, then add a 30% sodium silicate solution with a mass fraction of 4 times the lignin mass into the beaker, place the beaker on a shaker, Shaking and impregnating for 4 hours, after the shaking and impregnating, filter and separate to obtain the filter residue, which is the pre-modified lignin; mix the pre-modified lignin and the sodium hydroxide solution with a mass fraction of 5% in a mass ratio of 1:5, and mix it at 63 Stir and dissolve at ℃ for 2 hours to obtain a pre-modified lignin solution, add sodium borohydride with 4% pre-modified lignin mass to the pre-modified lignin solution, s...

example 3

[0031] Collect the papermaking black liquor and mix it with sodium hydroxide at a mass ratio of 10:1, heat and boil for 40 minutes, filter the boiled papermaking black liquor, separate the filtrate, adjust the pH of the filtrate to 4.5 with hydrochloric acid with a concentration of 2mol / L, and let it stand Precipitate for 3 hours, filter to obtain the precipitate, which is lignin; weigh the lignin and put it into a beaker, then add a 30% sodium silicate solution with a mass fraction of 5 times the lignin mass into the beaker, place the beaker on a shaker, Shaking and impregnating for 5 hours, after the shaking and impregnating, filter and separate to obtain the filter residue, which is the pre-modified lignin; mix the pre-modified lignin and the sodium hydroxide solution with a mass fraction of 5% in a mass ratio of 1:5, at 65 Stir and dissolve at ℃ for 3 hours to obtain a pre-modified lignin solution, add 5% sodium borohydride of pre-modified lignin mass to the pre-modified li...

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Abstract

The invention relates to the technical field of preparation of polyurethane materials, particularly relates to a hard polyurethane material reinforced by modified lignin and also relates to a preparation method of the hard polyurethane material reinforced by modified lignin. The method is characterized by firstly extracting lignin from papermaking black liquid, pre-modifying the lignin by using silicate, increasing the number of silicon hydroxyls on the surface of the lignin, then carrying out secondary modification by using sodium borohydride, reducing carbonyls on branched chains of the lignin into aliphatic hydroxyls by using sodium borohydride, and obviously increasing the number of reactive hydroxyls on the reduced lignin along with polymerization reaction and demethylating reaction, so that the reaction activity of the lignin is also obviously improved; the polymerization reaction degree of the modified lignin and isocyanate is also obviously enhanced, so that the mechanical property of the polyurethane prepared after polymerization is enhanced.; through the method, the mechanical property of the polyurethane material is obviously improved, so that the polyurethane material has broad application prospects.

Description

technical field [0001] The invention relates to the technical field of polyurethane material preparation, in particular to a modified lignin reinforced rigid polyurethane material, and also to a preparation method of the modified lignin reinforced rigid polyurethane material. Background technique [0002] As a structural material, rigid polyurethane material requires certain rigidity, strength and toughness. The method used to improve the mechanical properties of rigid polyurethane materials is to increase the material density and add reinforcements such as glass beads, glass fibers, carbon fibers, and lignin fibers to the material to obtain reinforced rigid polyurethane materials. [0003] As a renewable resource, lignin is abundant in output, cheap in price, degradable and non-polluting to the environment. Lignin is a polymer containing a large number of alcoholic and phenolic hydroxyl groups. Theoretically, it can replace polyether polyol and isocyanate to produce polyu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/48C08G18/64C08K5/521C08K5/5333C08K5/3492C08L75/08
CPCC08G18/4009C08G18/4825C08G18/4854C08G18/6492C08K5/34922C08K5/521C08K5/5333C08L75/08
Inventor 任建平林茂兰
Owner 南通市裕如工程材料有限责任公司
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