Method for preparing polyether polyol with low viscosity, low unsaturation degree, low odor and high activity

A high-activity polyether and polyol technology is applied in the field of preparing low-viscosity, low-unsaturation, low-odor, high-activity polyether polyols, and can solve the problems of poor physical properties and odor, complicated refining process, and long reaction time.

Pending Publication Date: 2021-07-23
岳阳昌德新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the presence of high-activity polyether polyols in the past can only be intermittent in the alkali metal catalyzed synthesis process, the reaction time is too long, the refining process is complicated, resulting in limited production capacity, and the product has a high degree of unsaturation. Products contain metals with poor physical properties and odor, and provide a new method for preparing polyether polyols with low viscosity, low unsaturation, low odor, and high activity by semi-continuous method using phosphazene catalyst

Method used

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  • Method for preparing polyether polyol with low viscosity, low unsaturation degree, low odor and high activity
  • Method for preparing polyether polyol with low viscosity, low unsaturation degree, low odor and high activity
  • Method for preparing polyether polyol with low viscosity, low unsaturation degree, low odor and high activity

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) First replace the entire device with nitrogen, and check that the airtightness is qualified (the whole device includes a 2L mixing tank, a 10L PO dropping tank, a 2L EO dropping tank, a 1L reactor 1, and a 0.5L reactor 2, 1L aging kettle, 3L degassing kettle, 3L receiving tank);

[0022] (2) Add initiator 300g glycerin and 1200g basic polyether 305 (3-500 molecular weight, self-produced by the factory) into the mixing tank, heat up to 100°C after dehydration is qualified, carry out nitrogen replacement, and then add 12.6 under nitrogen protection g phosphazene catalyst, stirred and mixed;

[0023] (3) Click on the feeding program controlled by the computer, feed 250g of polymerized substrate into Reactor 1 from the mixing tank, start stirring to raise the temperature to 100 degrees, and start PO dropwise addition. After the reaction is activated, feed about 750g of PO. At this time, the liquid level of Reactor 1 Basically full, start the normal feeding program at t...

Embodiment 2

[0025] (1) First replace the entire device with nitrogen, and check that the airtightness is qualified (the whole device includes a 2L mixing tank, a 10L PO dropping tank, a 2L EO dropping tank, a 1L reactor 1, and a 0.5L reactor 2, 1L aging kettle, 3L degassing kettle, 3L receiving tank);

[0026] (2) Add 1250g of initiator 1250g of basic polyether 204 (2 official 400 molecular weight, self-produced by the factory) 1136g into the mixing tank, heat up to 100°C and dehydrate, then carry out nitrogen replacement, and then add 25g of phosphazene under nitrogen protection Catalyst, stir and mix;

[0027] (3) Click on the computer-controlled feeding program, and the mixing tank feeds 113.6g of the polymer substrate into Reactor 1, starts stirring and raises the temperature to 100 degrees, and then starts PO dropwise addition. After the reaction is activated, PO feeds about 886.4g. At this time, Reactor 1 The liquid level is almost full. At this time, the normal feeding program is ...

Embodiment 3

[0029] (1) First replace the entire device with nitrogen, and check that the airtightness is qualified (the whole device includes a 2L mixing tank, a 10L PO dropping tank, a 2L EO dropping tank, a 1L reactor 1, and a 0.5L reactor 2, 1L aging kettle, 3L degassing kettle, 3L receiving tank);

[0030] (2) Add starter agent 1172g basic polyether 305 (3-500 molecular weight, self-produced by the factory) to the mixing tank, heat up to 100°C and dehydrate to pass the nitrogen replacement, then add 23g of phosphazene catalyst under the protection of nitrogen , stir well;

[0031](3) Click on the computer-controlled feeding program, and the mixing tank feeds 117.2 g of the polymer substrate into Reactor 1, and then starts stirring to raise the temperature to 100 degrees, and then starts PO dropwise addition. After the reaction is activated, PO feeds about 882.8 g. At this time, Reactor 1 The liquid level is almost full. At this time, the normal feeding procedure is started. The mixin...

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Abstract

The invention relates to a continuous method for preparing polyether polyol with low viscosity, low unsaturation degree, low odor and high activity by using a phosphazene catalyst as an olefin oxide ring-opening polymerization catalyst, and mainly solves the problems that existing high-activity polyether polyol can only be used in an intermittent alkali metal catalytic synthesis process, the reaction time is too long, the refining process is complex, the productivity is limited, the unsaturation degree of a product is high, and the product contains metal with poor physical properties and smell. According to the invention, the phosphazene catalyst, an initiator and oxyalkylene are continuously added into a continuous reactor to prepare the high-activity polyether polyol with narrow molecular weight distribution and low unsaturation, and the prepared polyol is blended, so that the problem of high viscosity caused by narrow molecular distribution is solved. The possibility is provided for the industrial production of preparing the low-viscosity low-unsaturation low-odor high-activity polyether polyol by a semi-continuous method.

Description

technical field [0001] The invention relates to a method for preparing polyether polyol, in particular to a method for preparing polyether polyol with low viscosity, low unsaturation, low odor and high activity. Background technique [0002] The full name of polyether polyol is polyoxyalkylene polyol. It belongs to polyalkylene ether or polyoxyalkylene in structure. Or copolymerization reaction synthesis. [0003] At present, the traditional alkali metal batch method, bimetallic complex batch or continuous catalytic method is mainly used to synthesize polyether polyols in my country's production. Alkali metal batch production of polyether polyols has relatively mild reaction conditions (temperature at 100-130°C, pressure at 0.2-0.5MPa), the reaction is easy to control, the cost of the catalyst is very low, and the viscosity of the reaction product is low. Chain transfer reactions are prone to occur in the medium, resulting in a series of disadvantages such as low relative ...

Claims

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Application Information

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IPC IPC(8): C08G65/28
CPCC08G65/2609C08G65/2675
Inventor 谢坚韧曾露蒋卫和李焙张小兵陈柯
Owner 岳阳昌德新材料有限公司
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