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Method for preparing polyether polyol with methanol as initiator

A polyether polyol and starter technology, which is applied in the field of polyether polyol preparation, can solve the problems of rare flexibility of polyurethane foam plastics, achieve excellent flexibility and application effect, high sag ratio, and expand the scope of application and field effects

Active Publication Date: 2018-03-02
ZIBO DEXIN LIANBANG CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are few studies on the flexibility of polyurethane foam in the industry

Method used

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  • Method for preparing polyether polyol with methanol as initiator
  • Method for preparing polyether polyol with methanol as initiator
  • Method for preparing polyether polyol with methanol as initiator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Preparation of Intermediate A:

[0018] At room temperature, put 9g of sodium methoxide into a 5L reactor for replacement, pump in 325g of methanol, heat up to 110°C, continuously feed 2750g of ethylene oxide, mature at 110°C for 7 hours, remove monomer for 4 hours, cool down and discharge for later use. The measured hydroxyl value OHV is 199.8 mgKOH / g.

Embodiment 2

[0020]

[0021] Add intermediate A, KOH, and deionized water at room temperature, replace and raise the temperature at 110°C for 5 hours, and measure the water content to be less than 0.03%, then feed the mixture of PO / EO to react, the reaction temperature is 110°C, and mature at 110°C for 7 hours, dehydration The monomer was processed for 4 hours, cooled and neutralized to obtain a refined polyether.

[0022] The various indexes of the polyether are as follows: hydroxyl value 28.9 mgKOH / g, acid value 0.042 mgKOH / g, moisture 0.032%, potassium ion 1 ppm, color value (APHA) 10, pH 6.50. After the polyurethane foam is made, the indentation ratio is 2.81 and the rebound rate is 78.1.

Embodiment 3

[0024]

[0025] Add intermediate A, KOH, and deionized water at room temperature, replace and raise the temperature at 110°C for 5 hours, and measure the water content to be less than 0.03%, then feed the mixture of PO / EO to react, the reaction temperature is 130°C, and the mixture is aged at 110°C for 6 hours. The monomer was processed for 4 hours, cooled and neutralized to obtain a refined polyether.

[0026] The various indexes of the polyether are as follows: hydroxyl value 30 mgKOH / g, acid value 0.041 mgKOH / g, moisture 0.031%, sodium ion 1 ppm, color value (APHA) 10, pH 6.38. After the polyurethane foam is made, the indentation ratio is 2.85 and the rebound rate is 78.6.

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Abstract

The invention belongs to the technical field of polyether polyol preparation, and in particular relates to a method for preparing polyether polyol by using methanol as an initiator. The method is to first use methanol, sodium methylate and ethylene oxide ring-opening polymerization to obtain an intermediate with a hydroxyl value of 190-210mgKOH / g, and then combine the intermediate with ethylene oxide, epoxy Mixtures of propane are reacted to produce polyether polyols. The present invention prepares polyether polyol with methanol as the starting agent, and the polyurethane foam thus prepared has excellent flexibility and application effect, high indentation ratio and rebound rate, and expands the application range of polyurethane foam and fields.

Description

technical field [0001] The invention belongs to the technical field of polyether polyol preparation, and in particular relates to a method for preparing polyether polyol by using methanol as an initiator. Background technique [0002] Polyether polyols are used more and more widely, mainly for the preparation of polyurethane foam. The flexibility of polyurethane foam is an important performance indicator. Due to the poor flexibility of polyurethane foam, the application range and fields of polyurethane foam are limited. [0003] CN 102718936 A discloses a polyurethane foam made of the following raw materials in parts by weight: polyether polyol A40-60; POP polyether 40-60; amine catalyst 0.4-0.7; organotin catalyst 0.1-0.2; silicone oil 0.4 -0.8; deionization 3; crosslinking agent 1-2; MDI 40-45; the polyether polyol A is DEP-330N. The polyurethane foam of the invention has good hardness, improves the flexibility of the product, and has excellent density, indentation rati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G65/28C08G18/48C08G101/00
Inventor 荆晓东荣若贵董伟孙言丛
Owner ZIBO DEXIN LIANBANG CHEM IND