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Method for testing residual sugars in sucrose series of polyether polyols

A technology of polyether polyol and testing method, which is applied in the field of rigid polyether polyol, can solve the problems of insufficient reaction and removal of sucrose, and achieve the effect of eliminating adverse effects and making the testing method practical

Inactive Publication Date: 2019-02-22
SHANDONG INOV NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the influence of the process and the amount of formula design, a part of the sucrose in this type of product polyether is often insufficiently reacted, and a small amount of residual sucrose is dissolved in the polyether and cannot be removed by filtration in the post-treatment process. The presence of residual sugar will have a certain impact on downstream applications, so the detection of residual sugar is often a crucial item in the synthesis of polyether polyols

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In a three-necked flask equipped with a stirrer, add 100 g of commercially available polyether polyol of the brand 8345, add 20 g of cyclopentane, place the three-necked flask in an ice-water bath at 0°C, and stir fully at a speed of 5 r / s After 30 minutes, the solution became turbid after mixing evenly, and after standing for 60 minutes, no obvious crystal grains precipitated. It shows that there is no residual sugar or a very small amount of residual sugar in the polyether polyol.

[0021] Reaction and detection time: 90min.

Embodiment 2

[0023] In a three-necked flask equipped with a stirrer, add 100 g of commercially available polyether polyol 8315, add 30 g of isopentane, place the three-necked flask in an ice-water bath at -3°C, and fully Stir for 60 minutes. After mixing evenly, the solution is clear. After standing for 30 minutes, a small amount of crystal grains are precipitated. It shows that there is residual sugar in the polyether polyol.

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PUM

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Abstract

The invention relates to a method for testing residual sugars in sucrose series of polyether polyols, and belongs to the technical field of rigid foam polyether polyols. The testing method comprises the following steps: 1, at room temperature, adding alkane in polyether polyols, and fully performing stirring in ice water bath; and 2, ensuring that the solution is turbid and is not transparent after stirring is completely carried out, and standing and then observing precipitation conditions of crystal grains. The testing method provided by the invention has the advantages of scientificity and reasonability, simplicity and feasibility, and moreover, whether sucrose is remained in a polyether product can be effectively detected, so that an adverse effect on downstream application caused by unqualified products is eliminated.

Description

technology field, [0001] The invention relates to a test method for residual sugar in sucrose series polyether polyols, belonging to the technical field of rigid foam polyether polyols. Background technique [0002] Polyether polyol is an oligomer of terminal hydroxyl groups. The hydroxyl groups on the main chain are connected by ether bonds. It uses low-molecular-weight polyols, polyamines or compounds containing active hydrogen as initiators, and it is decomposed with oxidized olefins under the action of a catalyst. ring polymerization. Polyol initiators include diols such as propylene glycol and diethylene glycol, triols such as glycerol trimethylolpropane, and polyols such as pentaerythritol, xylitol, sorbitol, and sucrose; amine initiators are diethylene glycol Amines, diethylenetriamine, etc. The synthesis steps of polyether polyols include the following steps: 1. Pretreatment of raw materials: pre-mix the initiator and catalyst, and add them to the reactor after vac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/82
CPCG01N21/82
Inventor 徐军史宏艺宁晓龙程铸洪
Owner SHANDONG INOV NEW MATERIALS CO LTD
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