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

Preparation of Cyclic Dipolybutylene Terephthalate

A technology for dimerization of butylene terephthalate and monobenzyl terephthalate, which is applied in the field of preparation of analytical and detection standard reference substances, can solve the problems of high price, low output, low yield and the like, and achieves operation Simple, low cost, high yield effect

Active Publication Date: 2017-02-15
天津阿尔塔科技有限公司 +1
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method has low yield, less output and high price

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
  • Preparation of Cyclic Dipolybutylene Terephthalate
  • Preparation of Cyclic Dipolybutylene Terephthalate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0035] Preparation of intermediate 4-triphenylmethoxybutanol (1):

[0036] The reaction formula is:

[0037] A dichloromethane solution (600 mL) of 1,4-butanediol (100 g, 1.11 mol), triphenylchloromethane (61.87 g, 0.22 mol) and triethylamine (66.67 g, 0.66 mol) was stirred overnight at room temperature. Add water, separate the organic phase and wash with water (200mL×3), wash with saturated brine, dry over anhydrous sodium sulfate, evaporate the solvent, separate and purify the residue with a silica gel column, and rinse with ethyl acetate / petroleum ether mixture to obtain 4- Triphenylmethoxybutanol 1, 63.9 g of yellow oil, yield 86.7%.

[0038] Preparation of intermediate 4-benzyloxybutanol (2):

[0039] The reaction formula is:

[0040] 1,4-Butanediol (28.5g, 0.32mol) was dissolved in anhydrous dimethylformamide (50mL), and the above solution was added dropwise to sodium hydride (6.3g, 0.158mol) in an ice bath with stirring. The suspension in water dimethylformamide...

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 specifically discloses a preparation method of novel cyclicpolybutylece terephthalate (PBT) dimer, wherein paraphthaloyl chloride and 1,4-butanediol are used as the raw materials for oriented synthesis of the cyclicpolybutylece terephthalate dimer through a protection and deprotectionstrategy, and the method is used for contrast analysis and detection of cyclicpolybutylece terephthalate dimer impurities in a PBT plastic. The chemical structural formula of the cyclicpolybutylece terephthalate dimer is described in the specification.

Description

[0001] [technical field] [0002] The invention belongs to the preparation of analysis and detection standard reference substances, in particular to a synthesis method of cyclic dipolybutylene terephthalate (Cyclic PBT Dimer). [0003] [Background technique] [0004] Polybutylene terephthalate, also known as polytetramethylene terephthalate, or PBT for short, is a condensation polymer of terephthalic acid and 1,4-butanediol. [0005] Polybutylene terephthalate (PBT) is a thermoplastic polyester crystalline engineering plastic with excellent performance, high rigidity and hardness, good thermal stability, excellent impact resistance, and wear resistance due to low friction coefficient Excellent resistance, good dimensional stability, low hygroscopicity, good chemical corrosion resistance. Due to its excellent performance, PBT is widely used in electronic appliances and accessories, auto parts, mechanical equipment and parts, etc. [0006] In the industrialized manufacturing pr...

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 Patents(China)
IPC IPC(8): C07D323/00
CPCC07D323/00
Inventor 张磊
Owner 天津阿尔塔科技有限公司