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Lignin modified phenolic resin and using method thereof

A phenolic resin, lignin technology, applied in the direction of aldehyde/ketone condensation polymer adhesives, adhesive types, adhesives, etc., to achieve the effects of reducing environmental pollution, simple production process, and improving medium and low temperature performance

Inactive Publication Date: 2013-01-16
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no report on the use of lignin-modified phenolic resins in refractory materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A lignin-modified phenolic resin and a method for using the same. The raw materials and contents of the lignin-modified phenolic resin are as follows: phenol is 20-22wt%, formaldehyde is 60-62wt%, and calcium lignosulfonate is 16-18wt%.

[0020] The preparation method of this embodiment is as follows: according to the above-mentioned raw materials and their contents, first melt the phenol into a liquid state at 60-70°C, put it into a reaction kettle, then add calcium lignosulfonate into the liquid phenol, and stir evenly; Then add 2-4wt% sodium hydroxide of the raw material, stir at 75-90°C for 0.4-0.6h, add formaldehyde, continue stirring for 1-3h, and dehydrate under reduced pressure to obtain a lignin-modified phenolic resin.

[0021] The lignin-modified phenolic resin prepared in this example is tested: free phenol is 0.11~0.15wt%; free aldehyde is 0.10~0.14wt%; viscosity is 500.54~520.65mpa.s; solid content is 45.8~46.6wt% .

[0022] The lignin-modified phenolic ...

Embodiment 2

[0026] A lignin-modified phenolic resin and a method for using the same. The raw materials and contents of the lignin-modified phenolic resin are as follows: phenol is 22-24wt%, formaldehyde is 56-58wt%, and calcium lignosulfonate is 18-20wt%.

[0027] According to the above raw materials and their contents, first melt the phenol into a liquid state at 60~70°C, put it into the reaction kettle, then add calcium lignosulfonate into the liquid phenol, stir evenly; then add 1.5~2wt of the raw materials % ammonia water, stirred at 75~90°C for 0.4~0.6h, added formaldehyde, continued to stir for 1~3h, and dehydrated under reduced pressure to obtain lignin-modified phenolic resin.

[0028] The lignin-modified phenolic resin prepared in this example is tested: free phenol is 0.18~0.22wt%; free aldehyde is 0.12~0.16wt%; viscosity is 710.83~732.96mpa.s; solid content is 44.7~45.5wt% .

[0029] The lignin-modified phenolic resin prepared in this example is used as a binder for magnesia-...

Embodiment 3

[0033] A lignin-modified phenolic resin and a method for using the same. The raw materials and contents of the lignin-modified phenolic resin are 24-26wt% of phenol, 62-64wt% of formaldehyde and 12-14wt% of calcium lignosulfonate.

[0034] According to the above raw materials and their contents, first melt phenol into a liquid state at 60~70°C, put it into the reaction kettle, then add calcium lignosulfonate into the liquid phenol, stir evenly; then add 3~5wt of the raw materials % sodium hydroxide, stirred at 75-90°C for 0.4-0.6h, added formaldehyde, continued to stir for 1-3h, and dehydrated under reduced pressure to obtain lignin-modified phenolic resin.

[0035] The lignin-modified phenolic resin prepared in this example is tested: free phenol is 0.16~0.20wt%; free aldehyde is 0.14~0.18wt%; viscosity is 440.22~460.34mpa.s; solid content is 46.2~47.0wt% .

[0036]The lignin-modified phenolic resin prepared in this example is used as a binder for aluminum-carbon bricks, an...

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Abstract

The invention particularly relates to a lignin modified phenolic resin and a using method of the lignin modified phenolic resin. The technical scheme is that the lignin modified phenolic resin comprises the following raw materials according to percentage by weight: 20-28 wt% of phenol, 56-64 wt% of formaldehyde, and 12-20 wt% of calcium lignosulphonate. The lignin modified phenolic resin is prepared by the following steps: according to the above raw materials and contents of the materials, fusing the phenol into liquid and placing the phenol into a reactor; adding the calcium lignosulphonate into the liquid phenol to be stirred evenly; adding sodium hydroxide which is 2-5 wt% of the raw material or ammonia water which is 1.5-2.5 wt% of the raw material to be stirred for 0.4-0.6 hours at 75-90 DEG C; adding the formaldehyde; continuing stirring for 1-3 hours; and decompressing to dewater. The prepared lignin modified phenolic resin serves as a bonding agent to be used in carbon-containing refractories; the adding amount of the lignin modified phenolic resin is 3-5 wt% of the carbon-containing refractories. The lignin modified phenolic resin disclosed by the invention is simple in production process, low in price and friendly to environment; and the product serving as the bonding agent can improve the medium and low temperature performance of the carbon-containing refractories.

Description

technical field [0001] The invention belongs to the technical field of carbon-containing refractory materials and modified phenolic resins. In particular, it relates to a lignin modified phenolic resin and a use method thereof. Background technique [0002] With the increasing development of economy and continuous progress of society, environmental protection has become the focus of people's attention. As a new type of binder, phenolic resin has been widely used in carbon-containing refractory materials such as magnesia-carbon bricks. However, since phenol is derived from non-renewable petrochemical products, as oil reserves become less and less, the price of phenol is getting higher and higher, resulting in an increasing cost of carbon-containing refractory materials, so how to reduce carbon-containing refractory materials from the binder Material cost has become an urgent problem to be solved. [0003] Lignin is a natural renewable aromatic polymer compound, which contai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/28C09J161/14C04B35/66
Inventor 赵雷方伟于晓燕陈玉龙李淑静李远兵雷中兴
Owner WUHAN UNIV OF SCI & TECH
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