Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for preparing brominated styrene-butadiene copolymer through heterogeneous oxidation

A technology of brominated styrene and heterogeneous oxidation, which is applied in the production of bulk chemicals, etc., can solve the problems of failing to meet the requirements of flame retardant properties of building materials products, poor flame retardant effect of halogen-free flame retardants, and halogen-free flame retardants. The problem of low flame retardant efficiency of the flame retardant, to achieve the effect of high bromine content, easy to control, and ensure the formation rate

Active Publication Date: 2019-06-28
TIANJIN BUILDING MATERIALS SCI RES INST
View PDF9 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above situation, the current international solution is to actively research halogen-free flame retardants. However, halogen-free flame retardants have low flame retardant efficiency, high dosage, high price, and high cost. They are generally used in toys, clothing, etc. and the human body. Products in close contact, and the impact of high prices of building materials on product costs is unacceptable, and the flame retardant effect of halogen-free flame retardants is not good, and cannot meet the requirements of building materials for flame retardancy

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
  • Method for preparing brominated styrene-butadiene copolymer through heterogeneous oxidation
  • Method for preparing brominated styrene-butadiene copolymer through heterogeneous oxidation
  • Method for preparing brominated styrene-butadiene copolymer through heterogeneous oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Dissolve 10g SBS with 70ml organic solvent chloroform, add 180g 45% tetraethylammonium bromide aqueous solution, be warming up to 25 ℃, add 0.3g tin tetrachloride, add dropwise 4.8g 50% citric acid aqueous solution as catalyst, Add 154g of ceric ammonium nitrate, after the addition is completed, react at a constant temperature for 3-5 hours, and let stand to separate layers;

[0036] (2) The organic phase of the lower layer after the above layering is washed 2-4 times with each 50ml 5% NaOH solution at a constant temperature of 25°C, and the washing time is 0.5-1h to remove impurities, and then 50ml of distilled water is used to wash The organic phase was washed several times with water, and the lower organic phase was dried with anhydrous calcium chloride solid;

[0037] (3) Add 1g Zr(OH) to the above dried organic phase 4 and 0.2g of phosphoric acid, at a temperature of 15°C-25°C, add 80ml of dimethyl sulfoxide solution containing 10g of NBS, heat up to 90-100°C ...

Embodiment 2

[0039] (1) Dissolve 10g of SBS with 70ml of organic solvent chloroform, add 180g of 45% aqueous solution of tetraethylammonium bromide, heat up to 25°C, add 0.3g of tin tetrachloride, add 154g of cerium ammonium nitrate, after the addition is completed, the constant temperature reaction is 3- 5 hours, let stand and stratify;

[0040] (2) The organic phase of the lower layer after the above layering is washed 2-4 times with each 50ml 5% NaOH solution at a constant temperature of 25°C, and the washing time is 0.5-1h to remove impurities, and then 50ml of distilled water is used to wash The organic phase was washed several times with water, and the lower organic phase was dried with anhydrous calcium chloride solid;

[0041] (3) Add 1g Zr(OH) to the above dried organic phase 4 and 0.2g of phosphoric acid, at a temperature of 15°C-25°C, add 80ml of dimethyl sulfoxide solution containing 10g of NBS, heat up to 90-100°C and reflux for 1-2 hours, and neutralize the excess with sodiu...

Embodiment 3

[0043] (1) Dissolve 10g SBS with 70ml organic solvent chloroform, add 180g 45% tetraethylammonium bromide aqueous solution, be warming up to 25 ℃, add 0.3g tin tetrachloride, add dropwise 4.8g 50% sodium carbonate aqueous solution as catalyst, Add 154g of ceric ammonium nitrate, after the addition is completed, react at a constant temperature for 3-5 hours, and let stand to separate layers;

[0044] (2) The organic phase of the lower layer after the above layering is washed 2-4 times with each 50ml 5% NaOH solution at a constant temperature of 25°C, and the washing time is 0.5-1h to remove impurities, and then 50ml of distilled water is used to wash The organic phase was washed several times with water, and the lower organic phase was dried with anhydrous calcium chloride solid;

[0045] (3) Add 1g Zr(OH) to the above dried organic phase 4 and 0.2g of phosphoric acid, at a temperature of 15°C-25°C, add 80ml of carbon tetrachloride solution containing 10g of NBS, heat up to 90...

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 provides a method for preparing a brominated styrene-butadiene copolymer through heterogeneous oxidation. The method comprises the following main steps: (1) dissolving SBS by virtue of an organic solvent, adding organic ammonium bromide water solution and a methyl bromination inhibitor, dropwise adding a small amount of an acid catalyst so as to adjust the pH value, adding a metal oxidizing agent, carrying out constant-temperature reaction, and standing for layering; (2) washing and drying an organic solvent on a lower layer; and (3) adding a solid acid catalyst and an NBS-containing organic solution into the dried organic phase, heating to 90-100 DEG C, carrying out reflux for 1-2 hours, cooling, neutralizing free bromine by virtue of an alkaline substance, precipitating byvirtue of a precipitant, filtering, and drying, so as to obtain a brominated SBS product. The method provided by the invention has the beneficial effects that the production energy consumption is low,the discharging of three wastes is greatly reduced, the obtained product is high in bromine content and yield, good in stability and suitable for the flame prevention of foam rubber products such asfoamed polyethylene, polypropylene and polystyrene.

Description

technical field [0001] The invention belongs to the technical field of synthesis of brominated flame retardants, and in particular relates to a method for preparing brominated styrene-butadiene copolymers through heterogeneous oxidation. Background technique [0002] Brominated flame retardants have high flame retardant properties, good heat resistance, and can meet the flame retardant requirements of various polymer materials. In addition, the source of raw materials is sufficient, the price is cheap, and the physical and mechanical properties of the substrate do not deteriorate too much. It is unmatched by other flame retardants and has always been favored by people. It is currently one of the largest and most widely used flame retardants on the market. Among all flame retardants currently used in polystyrene (PS) materials, hexabromocyclododecane (HBCD) has better compatibility with PS resins, and can make PS materials It has good flame retardant properties and can maint...

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
IPC IPC(8): C08F8/20C08F297/04C08L23/06C08L23/12C08L25/06C08L53/02
CPCY02P20/52
Inventor 杨倩刘彤张鹏宇滕藤李剑光
Owner TIANJIN BUILDING MATERIALS SCI RES INST
Features
  • Generate Ideas
  • 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