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Block copolymerized thermosetting resin, composite material and preparation method thereof

A technology of block copolymerization and composite materials, applied in the direction of aldehyde/ketone condensation polymer adhesives, adhesive types, adhesives, etc., can solve problems such as limited application range, low product added value, environmental pollution, etc., and achieve broad The effect of market prospects

Pending Publication Date: 2021-10-22
木质素重庆科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, people's utilization rate of lignin is far less than that of cellulose. Less than 2% of the world's annual production of about 150-180 million tons of industrial lignin is utilized, and lignin resources are largely wasted.
In particular, the black liquor discharged from the paper industry contains a large amount of lignin, but most of it is concentrated as a cheap fuel and then burned or discharged arbitrarily, which not only does not reuse the lignin in it, but also brings serious environmental pollution
[0004] In addition, the vast majority of lignin products in my country are crude products with few types and limited application range. Most of them are added to concrete as building materials or used in pesticide dispersants, oilfield chemicals, refractory adhesives, etc., and the added value of products is low. , has not yet formed a large-scale market and is not widely used

Method used

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  • Block copolymerized thermosetting resin, composite material and preparation method thereof
  • Block copolymerized thermosetting resin, composite material and preparation method thereof
  • Block copolymerized thermosetting resin, composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Alkali lignin (the powder obtained by spray drying of papermaking black liquor, which contains alkali lignin such as lignin phenol sodium salt, lignin phenol potassium salt) is dissolved in water according to the weight ratio of 1:1.57, stirs evenly, And adjust its pH to 9, add formaldehyde according to the weight ratio of alkali lignin and formaldehyde of 1:0.55, and stir and react at 88°C for 3h;

[0047] (2) Disperse melamine and water at a mass ratio of 1:0.4, and add formaldehyde dropwise to the melamine dispersion according to the weight ratio of melamine and formaldehyde of 1:1.52, and stir until the system is uniform (no more than 30 minutes) , the reaction temperature is 88°C;

[0048] (3) Pour the homogeneous system obtained after the reaction of step (2) into the system after the reaction of step (1) and mix. After mixing, the weight ratio of melamine to alkali lignin is 0.4:1, and continue to stir for 3 hours. The reaction temperature is 88 ℃;

[0049]...

Embodiment 2

[0052] (1) Get the concentrated papermaking black liquor (which contains alkali lignin such as lignin phenol sodium salt, lignin phenol potassium salt), and adjust its pH to 8, according to the alkali lignin and formaldehyde weight ratio of 1:0.55 Proportionally add formaldehyde, stir and react at 90°C for 2 hours;

[0053] (2) Disperse melamine and water at a mass ratio of 1:0.4, and add formaldehyde dropwise to the melamine dispersion at a weight ratio of 1:1.55 between melamine and formaldehyde, and stir until the system is uniform (no more than 30 minutes) , the reaction temperature is 90°C;

[0054] (3) Pour the homogeneous system obtained after the reaction of step (2) into the system after the reaction of step (1) for mixing. After mixing, the weight ratio of melamine to alkali lignin is 0.5:1, continue to stir for 3 hours, and the reaction temperature is 88 ℃;

[0055] (4) performing solid-liquid separation on the system obtained in step (3), rinsing the obtained solid...

Embodiment 3

[0058] (1) Dissolve lignin in water at a weight ratio of 5:3, stir evenly (until the lignin becomes a paste without particles), and adjust its pH to 9, according to the weight ratio of lignin and formaldehyde 1:0.58 The proportion of formaldehyde was added, and the reaction was stirred at 85°C for 2h;

[0059] (2) Disperse melamine and water at a mass ratio of 1:0.5, and add formaldehyde dropwise to the melamine dispersion at a weight ratio of 1:1.5 between melamine and formaldehyde, and stir until the system is uniform (no more than 30 minutes) , the reaction temperature is 90°C;

[0060] (3) Pour the homogeneous system obtained after the reaction in step (2) into the system after the reaction in step (1) and mix. After mixing, the weight ratio of melamine to lignin is 0.5:1, continue to stir and react for 3 hours, and the reaction temperature is 90°C ;

[0061] (4) performing solid-liquid separation on the system obtained in step (3), rinsing the obtained solid, and drying...

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Abstract

The invention discloses block copolymerized thermosetting resin, a composite material and a preparation method thereof. The preparation method of the block copolymerized thermosetting resin comprises the following steps: (1) adding an aldehyde substance into a liquid containing lignin or / and alkali lignin to react; (2) adding an aldehyde substance into the polyamine solution for reaction; (3) mixing the system obtained by the reaction in the step (2) with the system obtained by the reaction in the step (1), and continuously reacting; (4) carrying out solid-liquid separation on the system obtained in the step (3) to obtain a solid which is first thermosetting resin; and (5) adjusting the pH value of the system obtained in the step (4) to 3-6 to settle and separate out a solid, and separating the solid to obtain the second thermosetting resin. The lignin is converted into novel thermosetting resin, so that the lignin is reasonably utilized, and waste is turned into wealth.

Description

technical field [0001] The invention relates to the technical field of thermosetting polymer materials, in particular to a block-copolymerized thermosetting resin, a composite material and a preparation method thereof. Background technique [0002] Lignin mainly exists in woody plants, herbaceous plants and vascular plants. Lignin, cellulose and hemicellulose are the main components of the plant skeleton, and its amount in nature is second only to cellulose in natural organic matter. An estimated 150 billion tons of lignin are produced worldwide annually from plant growth. [0003] At present, the utilization rate of lignin is far less than that of cellulose. Less than 2% of the 150-180 million tons of industrial lignin produced in the world every year is utilized, and lignin resources are largely wasted. In particular, the black liquor discharged from the paper industry contains a large amount of lignin, but most of it is concentrated as a cheap fuel and then burned or dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G14/10C08L61/28C08L61/34C09J161/34
CPCC08G14/10C08L61/28C09J161/34C08G2170/00C08L2201/08C08L61/34
Inventor 柳炜肖青蓝黄兴亮郝尧柳佳宁李天安
Owner 木质素重庆科技有限公司