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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
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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, such as: the hydroxyl group enhances the hydrogen bond between PAG polyether , which increases the pour point of PAG polyether; because the hydroxyl group has strong water absorption, the corrosion resistance of the quenching liquid system is reduced; in addition, the existence of terminal hydroxyl groups makes the oxidation resistance, stability, and stability of the PAG polyether quenching liquid Quenching properties, etc. are affected to a certain extent

Method used

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  • 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

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preparation example Construction

[0039] In the first aspect, the present application provides a method for preparing PAG polyether terminated by alkyl groups at both ends, characterized in that the preparation method comprises the following steps:

[0040] S1: Under an inert atmosphere and in the presence of a catalyst, react the polyol initiator 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 under the following conditions to obtain the first PAG polyether intermediate terminated by an alkyl group at both ends;

[0041] S2: Under an inert atmosphere and in the presence of a catalyst, make the first two-end alkyl-terminated PAG polyether intermediate and the second part of ethylene oxide and the second part of propylene oxide be at a temperature of 100 to 110 The random copolymerization is carried out under the reaction temperature of ℃ and the reaction pressure of 0-0....

Embodiment 1

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

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

[0070] (1) Add 20g of glycerin and 2.17g of potassium methoxide catalyst into a dry and well-sealed reaction kettle, replace with positive and negative nitrogen pressure three times, raise the temperature to 80-85°C for dehydration with nitrogen for 1 hour, add dropwise 740.5g of ethylene oxide, 325.4g of propylene oxide mixture was reacted at a reaction temperature of 120-130°C and a pressure of 0-0.3Mpa. After the dropwise addition was completed, the temperature was maintained for 2 hours, degassed for 30 minutes, and finally cooled to 60°C for discharge;

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

Embodiment 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 20g of diethylene glycol and 1.88g of potassium methoxide catalyst into a dry and well-sealed reaction kettle, replace it with positive and negative nitrogen pressure three times, raise the temperature to 80-85°C for dehydration with nitrogen blowing for 1 hour, and add 692g of ethylene oxide dropwise , 231g of propylene oxide mixture was reacted at a reaction temperature of 120-130°C and a pressure of 0-0.3Mpa. After the dropwise addition was completed, the temperature was maintained for 2 hours, degassed for 30 minutes, and finally cooled to 60°C for discharge;

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

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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

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Application Information

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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
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