Supercharge Your Innovation With Domain-Expert AI Agents!

Production method of brominated lignin

A production method and lignin technology, applied in the field of brominated lignin, can solve the problems of large-scale application limitations, poor flame retardancy, low glass transition temperature, etc., achieve low solvent recovery costs, increase bromine content, and heat resistance Improved effect

Inactive Publication Date: 2017-06-13
ZHEJIANG FORESTRY UNIVERSITY
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to its low glass transition temperature and poor flame retardancy, traditional bisphenol A epoxy resin does not meet the requirements of high-frequency high-performance electronics industry and aerospace industry
Tetrabromobisphenol A is widely used in the electronics industry and aerospace industry due to its excellent flame retardant properties, but the high cost of this product limits its large-scale application, and its raw materials come from the petrochemical industry to increase environmental load
After retrieval and market research, there is no data report or real product on the market that uses brominated lignin instead of tetrabromobisphenol A as a flame retardant.

Method used

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
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Production method of brominated lignin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1 (corresponding example raw material and proportioning value thereof in comparison table 1): 1 part of lignin is added to reactor, then add 10 parts of organic solvent, stir 2-6 hour, then add 0.5 part of bromine, 0.2 part of hydrogen peroxide, Stir at 30-40°C for 1 hour, pour the above reactant into a water tank filled with 30 parts of water and stir to precipitate brominated lignin, centrifuge and separate the precipitate, and dry to obtain a brominated lignin product with a bromine content of 19%. .

Embodiment 2

[0017] Embodiment 2 (corresponding embodiment raw material and proportioning value thereof in comparison table 1): 1 part of lignin is added to reactor, then add 15 parts of organic solvents, stir 2-6 hour, then add 1 part of bromine, 0.3 part of hydrogen peroxide, Stir at 30-40°C for 1 hour, pour the above reactant into a water tank with 40 parts of water and stir to precipitate the brominated lignin, centrifuge the precipitate, dry it, and obtain a brominated lignin product with a bromine content of 27%. .

Embodiment 3

[0018] Embodiment 3 (corresponding embodiment raw material and proportioning value thereof in comparison table 1): 1 part of lignin is added to reaction kettle, then add 20 parts of organic solvents, stir for 2-6 hours, then add 5 parts of bromine, 0.4 part of hydrogen peroxide, Stir at 30-40°C for 1 hour, pour the above reactant into a water tank filled with 50 parts of water and stir to precipitate brominated lignin, centrifuge and separate the precipitate, and dry to obtain a brominated lignin product with a bromine content of 42%. .

[0019] The rest of Examples 4-8 are prepared in the same way as Example 1 with reference to the raw materials and proportioning values ​​of the corresponding examples in Table 1, among which Examples 1-3 are preferred.

[0020] Lignin reacts with bromine, and bromine can be introduced at the α-position, β-position and the ortho- and para-position of the benzene ring, and the combination of bromine and lignin is stable. Utilizing this princip...

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
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a production method of brominated lignin. The production method comprises the following four steps: I, preparing a lignin raw material; II, dissolving lignin; III, brominating the lignin; and IV, preparing the brominated lignin. The brominated lignin prepared by the method is low in production cost, environmentally friendly and better in flame-retardant effect. Primary raw materials are regenerable and inexhaustible, and an organic solvent can be recycled, so that the brominated lignin is an ideal substitute product for a tetrabromo bisphenol A flame retardant.

Description

technical field [0001] The invention relates to a method for producing brominated lignin by using lignin extracted with an organic solvent from gramineous plant steam explosion slurry as a raw material. Background technique [0002] Tetrabromobisphenol A is an excellent flame retardant prepared from polymer materials with the largest output and consumption. It can endow various resin materials with excellent combustion resistance and self-extinguishing properties. Tetrabromobisphenol A is also a synthetic flame retardant Intermediates, widely used in electrical insulation materials, printed circuit boards of electronic appliances, aerospace rockets, missiles, aircraft, ships and other fields. With the rapid development of the electronics industry and the aerospace industry, the requirements for epoxy resin are becoming more and more specialized. In addition to requiring specific activity and concentrated molecular weight distribution of epoxy resin, it also requires high den...

Claims

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
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00
CPCC08H6/00
Inventor 金贞福李倩丁婷婷
Owner ZHEJIANG FORESTRY UNIVERSITY
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com