Two-end alkyl-terminated PAG polyether and preparation method thereof

An alkyl-terminated, polyether technology, used in manufacturing tools, heat treatment equipment, quenching agents, etc., can solve the problems of oxidation resistance, stability, influence of quenching performance, reduce corrosion resistance of quenching liquid system, etc. Corrosion resistance, excellent hardenability, low foaming effect

Pending Publication Date: 2021-04-20
SHANGHAI DONGDA CHEM
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007]Although PAG polyether quenching liquid has been widely used in metal heat treatment, the existence of terminal hydroxyl groups in its structure has certain limitations in its application. For example: the hydroxyl group enhances the hydrogen bonding force between the PAG polyethers and increases the pour point of the PAG

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
  • Two-end alkyl-terminated PAG polyether and preparation method thereof
  • Two-end alkyl-terminated PAG polyether and preparation method thereof
  • Two-end alkyl-terminated PAG polyether and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0039] In a first aspect, the present application provides a preparation method of both-end alkyl-terminated PAG polyether, characterized in that the preparation method comprises the following steps:

[0040] S1: in the presence of a catalyst in an inert atmosphere, the polyol initiator is allowed to react with the first part of ethylene oxide and the first part of propylene oxide at a reaction temperature of 120-130°C and a reaction pressure of 0-0.3Mpa Random copolymerization is carried out to obtain a PAG polyether intermediate that is terminated by alkyl groups at both ends;

[0041] S2: in an inert atmosphere and in the presence of a catalyst, make the first end-alkyl-terminated PAG polyether intermediate, the second part of ethylene oxide and the second part of propylene oxide at 100-110 Random copolymerization is carried out at a reaction temperature of ℃ and a reaction pressure of 0-0.1 Mpa to obtain a PAG polyether intermediate that is terminated by alkyl groups at bo...

Example Embodiment

[0067] Example 1

[0068] This example relates to the synthesis of both ends of the alkyl-terminated PAG polyether CPAG-1.

[0069] 1. Preparation of intermediate PAG-1 polyether

[0070] (1) Add 20 g of glycerol and 2.17 g of potassium methoxide catalyst to a dry and well-sealed reactor, replace with positive and negative nitrogen pressure three times, heat up to 80-85 °C for dehydration with nitrogen for 1 h, and dropwise add 740.5 g of ethylene oxide, 325.4g of propylene oxide mixture was reacted, the reaction temperature was 120~130℃, the pressure was 0~0.3Mpa, the dropwise addition was completed, the temperature was maintained for 2h, degassed for 30min, and finally the temperature was lowered to 60℃ for discharging;

[0071] (2) Add 100 g of the finished product synthesized in the above (1) and 0.5 g of potassium hydride catalyst into a dry and well-sealed reaction kettle, replace with nitrogen positive and negative pressure three times, heat up to 110-120 ° C for dehydra...

Example Embodiment

[0074] Example 2

[0075] This example relates to the synthesis of both ends of the alkyl-terminated PAG polyether CPAG-2.

[0076] 1. Preparation of intermediate PAG-2 polyether

[0077] (1) Add 20 g of diethylene glycol and 1.88 g of potassium methoxide catalyst to a dry and well-sealed reaction kettle, replace with positive and negative nitrogen pressure three times, heat up to 80-85 °C for 1 hour of dehydration with nitrogen dehydration, and dropwise add 692 g of ethylene oxide , 231g of propylene oxide mixture was reacted, the reaction temperature was 120~130℃, the pressure was 0~0.3Mpa, the dropwise addition was completed, the temperature was maintained for 2h, degassed for 30min, and finally the temperature was lowered to 60℃ for discharging;

[0078] (2) Add 100 g of the finished product synthesized in the above (1) and 0.45 g of potassium hydride catalyst into a dry and well-sealed reaction kettle, replace with positive and negative nitrogen pressure three times, hea...

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 two-end alkyl-terminated PAG polyether and a preparation method thereof. The two-end alkyl-terminated PAG polyether disclosed by the invention is a novel PAG polyether obtained by taking traditional PAG polyether as basic polyether and carrying out alkyl termination on terminal hydroxyl of the traditional PAG polyether. The alkyl-terminated PAG polyether provided by the invention has excellent viscosity-temperature performance and corrosion resistance and lower pour point and foamability. Under the condition of consistent kinematic viscosity at 40 DEG C, the quenching liquid compounded by the alkyl-terminated PAG polyether at two ends has more excellent quenching performance.

Description

technical field [0001] The application relates to the fields of organic synthesis and metal heat treatment, in particular to a PAG polyether capped with both ends of an alkyl group and a preparation method thereof. The present application also relates to a quenching liquid containing the PAG polyether terminated by both ends of an alkyl group and a preparation method thereof. Background technique [0002] Polyalkylene glycol (PAG) is a random copolymer of ethylene oxide and propylene oxide. The quenching liquid based on polyalkylene glycol polyether is a water-based quenching liquid medium, which is environmentally friendly, non-toxic, smokeless, odorless, non-corrosive, non-combustible, anti-aging, long service life, good cooling performance, and quenching It has the advantages of small amount of carry-out, stable chemical properties, and low cost. Compared with the commonly used cooling medium water and oil, PAG quenching liquid has obvious advantages in metal heat treat...

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): C08G65/28C08G65/337C21D1/60
Inventor 何志强岳瑞丽陆晨陈骥梅生富
Owner SHANGHAI DONGDA CHEM
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap