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Water-based polyether polyalkylene glycol for high-molecular-weight narrow-distribution metal heat treatment and preparation method thereof

A polyalkylene glycol and metal heat treatment technology, which is applied in the field of metal heat treatment, can solve the problems of lower viscosity index, affect the quality of polyether, and poor viscosity-temperature performance, and achieve excellent viscosity-temperature performance, easy control, and short production cycle Effect

Active Publication Date: 2020-04-14
SHANGHAI DONGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing water-based polyether polyalkylene glycol has a wide molecular weight distribution, and the actual molecular weight is quite different from the designed molecular weight. If the same viscosity is to be achieved, the designed molecular weight needs to be far greater than the actual molecular weight, which not only increases the cost, but also The various properties of polyether also decline accordingly, such as its viscosity index decreases, and its viscosity-temperature performance is poor. When it is applied in the field of quenching fluid, the low-temperature quenching speed is fast, which is easy to cause metal cracking, etc.
In addition, wide distribution polyether is often accompanied by side reactions such as double bond isomerization during the reaction, and the color value is darker, which seriously affects the quality of polyether

Method used

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  • Water-based polyether polyalkylene glycol for high-molecular-weight narrow-distribution metal heat treatment and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Aggregate in two steps:

[0045] (1) Add 0.8kg of diethylene glycol and 11.321g of potassium hydroxide catalyst into a dry and well-sealed reaction kettle, replace the positive and negative pressure of nitrogen three times, raise the temperature to 100-110°C for dehydration for 0.5h, and drop 4.723kg of epoxy Ethane, 2.024kg propylene oxide mixture reaction, reaction temperature 120 ~ 130 ℃, pressure 0 ~ 0.3Mpa, after the dropwise addition, keep the temperature for aging for 2 hours, degas for 30 minutes, and finally cool down to 60 ℃ and discharge;

[0046] (2) Add 0.8 kg of the intermediate synthesized in the first step and 4.080 g of potassium hydride catalyst in the reaction kettle, replace the positive and negative pressure of nitrogen three times, raise the temperature to 110-120 °C for dehydration for 1 hour, add dropwise 10.240 kg of ethylene oxide, 2.560 The mixture of kg propylene oxide was reacted at a reaction temperature of 80-100°C and a pressure of 0-0.1M...

example 2

[0048] Aggregate in two steps:

[0049] (1) Add 0.8kg of glycerin and 22.174g of potassium methoxide catalyst into a dry and well-sealed reaction kettle, replace with positive and negative nitrogen pressure three times, heat up to 100-110°C for dehydration for 0.5h, add dropwise 9.788kg of ethylene oxide, 4. 195kg 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;

[0050] (2) Add 0.8kg of the intermediate synthesized in the first step and 7.059g of potassium hydride catalyst into a dry and well-sealed reactor, replace it with positive and negative nitrogen pressure three times, raise the temperature to 110-120°C for dehydration for 1 hour, and add 10.654kg dropwise A mixture of ethylene oxide and 2.664kg of propylene oxide was reacted at a reaction temperature of 80-100°...

example 3

[0052] Aggregate in two steps:

[0053] (1) Add 0.8kg of pentaerythritol and 26.441g of potassium methoxide catalyst into a dry and well-sealed reaction kettle, replace the positive and negative pressure of nitrogen three times, raise the temperature to 80-85°C for dehydration with nitrogen for 1 hour, and add 11.779kg of ethylene oxide dropwise , 5.048kg 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;

[0054] (2) Add 0.8 kg of the intermediate synthesized in the first step and 7.467 g of potassium hydride catalyst in a dry and well-sealed reaction kettle, replace the positive and negative pressure of nitrogen three times, raise the temperature to 110-120 ° C for 1 hour, and add 7.893 kg dropwise A mixture of ethylene oxide and 1.973kg of propylene oxide was reacted a...

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Abstract

The invention relates to water-based polyether polyalkylene glycol for high-molecular-weight narrow-distribution metal heat treatment and a preparation method of the water-based polyether polyalkyleneglycol. The method comprises the following steps: (1) dehydrating polyhydric alcohol serving as a first initiator in the presence of a metal alkali serving as a first catalyst, dropwise adding an epoxy compound for reaction, and curing, degassing and cooling to obtain a polyalkylene glycol polyether intermediate; and (2) taking the polyalkylene glycol polyether intermediate prepared in the step (1) as a second initiator and an alkali metal hydride as a second catalyst, dehydrating, dropwise adding an epoxy compound, curing, degassing and cooling to obtain the high-molecular-weight narrow-distribution water-based polyether polyalkylene glycol. The number-average molecular weight of the polyalkylene glycol polyether prepared by the method is 10000 to 50000; the molecular weight distributioncoefficient MW / MN is equal to 1.15-1.4, the molecular weight is high, the molecular weight distribution is narrow, the corresponding kinematic viscosity at 40 DEG C can reach 15000-80000mm < 2 > / s, the viscosity index is 400-550, the viscosity is high, and the thickening property, the shearing resistance and the viscosity-temperature property are very excellent.

Description

technical field [0001] The invention relates to the technical field of metal heat treatment, in particular to a high-molecular-weight narrow-distribution water-based polyether polyalkylene glycol and a preparation method thereof. Background technique [0002] Metal heat treatment is to heat a metal or alloy workpiece in a certain medium to a suitable temperature, and keep it at this temperature for a certain period of time, and then cool it in a different medium at different speeds. A process in which microstructures are used to control their properties. In the process of metal heat treatment, oily substances are generally used as heat treatment medium, referred to as oil base fluid. However, oil-based fluids tend to generate a large amount of smoke when used, which pollutes the environment, is not environmentally friendly, and causes harm to personnel. [0003] Polyalkylene glycol, English name PAG, also known as polyether synthetic oil, or water-based polyether polyalkyl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/28
CPCC08G65/2609C08G65/2648
Inventor 董建国岳瑞丽陆晨黄斌李永磊
Owner SHANGHAI DONGDA CHEM
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