Unlock instant, AI-driven research and patent intelligence for your innovation.

Small molecular weight BPS (brominated polystyrene) product and preparation method thereof

A small molecular weight and molecular weight technology, applied in the field of small molecular weight BPS products and their preparation, can solve the problems of inability to meet the thin-walled field, complex preparation process, large molecular weight of the product, etc., achieve small impact on mechanical properties, expand application fields, molecular weight distribution narrow effect

Active Publication Date: 2019-05-17
山东旭锐新材股份有限公司
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The Chinese patent with the publication number CN102504067B discloses a method for preparing brominated polystyrene, which can prepare polystyrene with a narrow molecular weight distribution, but after the reaction is completed, it is necessary to add a fat-removing bromine agent to remove the main product produced in the reaction. Chain bromine by-products, separation of dichloroethane, complex process, and large molecular weight, can not meet some thin-walled areas;
[0004] The patent application number CN200910070904.0 discloses a method of synthesizing brominated polystyrene by using antimony trichloride as a catalyst for the reaction between polystyrene and bromine chloride, and at the same time using an emulsifying homogenizer for centrifugal separation; application number is CN200410067961 The patent of .0 announced a method for preparing brominated polystyrene by mixing Lewis acid and metal as a mixed catalyst. None of the above patents solved the complex preparation process, cumbersome impurity removal process in the later stage, and the high molecular weight of the product, which could not meet certain requirements. application issues in some fields

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: a kind of preparation method of small molecular weight BPS product

[0036] A kind of preparation method of low molecular weight BPS product of the present embodiment, comprises the following steps:

[0037] Step 1. Raw material preparation:

[0038] (1) Preparation of anhydrous dichloromethane: put 360g of dichloromethane in a four-necked flask, add 1.5g of phosphorus pentoxide, stir for 5-6 hours, and check that the water content is less than 0.03%;

[0039] (2) Vaporization of liquid chlorine: After the liquid chlorine in the steel cylinder is vaporized by the vaporization pool, it is stored in the buffer tank for future use.

[0040] Step 2, synthetic bromine chloride:

[0041] Add 75g of dichloromethane and 50g of bromine into the four-necked bottle, lower the temperature to -10--13°C, and then slowly inject 23g of chlorine gas into the four-necked bottle. After the chlorine gas is added, keep the low temperature and keep it warm for 10 minutes, the...

Embodiment 2

[0063] Embodiment 2: a kind of preparation method of small molecular weight BPS product

[0064] A kind of preparation method of low molecular weight BPS product of the present embodiment, comprises the following steps:

[0065] Step 1. Raw material preparation:

[0066] (1) Preparation of anhydrous dichloromethane: put 360g of dichloromethane in a four-necked flask, add 1.5g of phosphorus pentoxide, stir for 5-6 hours, and check that the water content is less than 0.03%;

[0067] (2) Vaporization of liquid chlorine: After the liquid chlorine in the steel cylinder is vaporized by the vaporization pool, it is stored in the buffer tank for future use.

[0068] Step 2, synthetic bromine chloride:

[0069] Add 75g of dichloromethane and 50g of bromine into the four-necked bottle, lower the temperature to -10--13°C, and then slowly inject 23g of chlorine gas into the four-necked bottle. After the chlorine gas is added, keep the low temperature and keep it warm for 10 minutes, the...

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 small molecular weight BPS (brominated polystyrene) product and a preparation method thereof. The method comprises the following steps: synthesis of bromine chloride, synthesis of small molecular weight PS, bromination reaction and aftertreatment, wherein synthesis of small molecular weight PS comprises batching, reaction, curing, washing and drying; the reaction is conducted as follows: a styrene / BPO mixture is added dropwise to a flask within 1-1.5 hours, the reaction temperature is controlled at 80-84 DEG C during dropwise addition, the temperature is raised to 88 DEG C after dropwise addition is completed, thermal reaction is performed for 4 hours, and the temperature is controlled at 87-90 DEG C. The product obtained with the method has molecular weight Mw of30,000-50,000 and molecular weight distribution Mw / Mn of 1.8, the process is mild in condition and easy to operate and grasp, comprehensive properties of the BPS product are improved, fluidity and compatibility are good, influence on mechanical properties is small, incomparable advantages are achieved in processing small, complex and thin-walled components, and the application field is expanded.

Description

technical field [0001] The invention relates to the technical field of fine chemicals, in particular to a small molecular weight BPS product and a preparation method thereof. Background technique [0002] BPS, the Chinese name is brominated polystyrene, CAS number is 88497-56-7, insoluble in water, alcohol, ether, methylene chloride, etc., soluble in tetrahydrofuran, bromochloromethane, is a new type of brominated flame retardant It is a white or light yellow powder obtained by bromination and crushing of PS under catalysis; the product has good chemical stability and thermal stability, good compatibility with engineering plastics, and has little effect on the mechanical properties of materials. Products added with BPS have no precipitation, no frost on the surface, excellent antistatic performance and can still retain more than 90% of the mechanical properties. It can be widely used in glass fiber nylon, PET, PBT, and is an excellent substitute for decabromodiphenyl ether. ...

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): C08F8/20C08F112/08
Inventor 王良民王强杨凯李金忠杨振振王彩芸段升芹
Owner 山东旭锐新材股份有限公司