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Polytetrafuran-base block polyether diol and its preparing method

A polytetrahydrofuran-based block and polyether diol technology is applied in the field of polyether polyol for high-performance polyurethane, can solve problems such as complex process control, and achieves low preparation cost, improved toughness, adhesion and gloss. improved effect

Active Publication Date: 2009-08-12
JIANGSU ZHONGSHAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the process control in the preparation process of tetrahydrofuran-propylene oxide (or ethylene oxide) random copolyether is comparatively complicated

Method used

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  • Polytetrafuran-base block polyether diol and its preparing method
  • Polytetrafuran-base block polyether diol and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In a 2L dry and clean stainless steel reactor, weigh the PTMEG with molecular weight Mn of 1000 as 100g of starter, and 0.01g of DMC catalyst (model: MMC 2005.10.11, Research Institute of Sinopec Jinling Petrochemical Company, the same below) and Mix 0.001g of sulfuric acid, and vacuum strip at 120-130°C under stirring, N 2 Change several times, first pass at 140°C About 50g of propylene oxide, when the temperature rises rapidly in the reactor and When there is a significant drop in pressure, continue to The remaining propylene oxide (100g in total) is aged to -0.1MPa (the pressure in the reactor, the same below) after passing through. Remove unreacted propylene oxide and small molecules, cool down and discharge to obtain the required PTMEG-PPG polyether diol.

[0021] The performance index of the obtained PTMEG-PPG polyether diol:

[0022] Hydroxyl value: 56.1mgKOH / g; Moisture content: 0.05%.

Embodiment 2

[0024] In a 2L dry and clean stainless steel reactor, weigh PTMEG with a molecular weight Mn of 162 as the initiator 100g, Mix 0.006g DMC catalyst and 0.001g phosphoric acid, stir After vacuum stripping at 120-130°C in the state, N 2 Change several times, pass through at 140°C Propylene oxide 35g, aged to -0.1MPa after passing through, true Remove unreacted propylene oxide and small molecules, cool down and discharge to obtain the required PTMEG-PPG polyether diol.

[0025] The performance index of the obtained PTMEG-PPG polyether diol:

[0026] Hydroxyl value: 513mgKOH / g; Moisture content: 0.05%.

Embodiment 3

[0028] Weigh 100g of PTMEG with a molecular weight of Mn of 162 in a 2L dry and clean stainless steel reactor as an initiator, mix it with 0.08g of DMC catalyst and 0.001g of acetic acid, and vacuum strip it at 120-130°C under agitation. 2 Change several times, first pass at 120°C The mixture of propylene oxide and ethylene oxide (PO / EO ratio is 1 / 1) is about 30g, when the temperature in the reactor rises rapidly and When there is a significant drop in pressure, continue to A total of 63g of the remaining mixture of propylene oxide and ethylene oxide, aged to -0.1MPa after passing through, really Remove unreacted propylene oxide and small molecules, cool down and discharge to obtain the required PTMEG-PPG polyether diol.

[0029] The performance index of the obtained PTMEG-PPG polyether diol:

[0030] Hydroxyl value: 425mgKOH / g; Moisture content: 0.05%.

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Abstract

A polytetrahydrofuryl block polyether diol is characterized in that it has the following general structural formula: HO-[A1]a1-[CH2CH2CH2CH2O]n-[A2]a2-H (I); wherein: unit structure A1 Represents ether structures such as CH(CH3)CH2O, CH(CH3)CH2OCH2CH2O, A2 represents ether structures such as CH2CH(CH3)O, CH2CH2OCH2CH(CH3)O, and a1 or a2 represents the unit structure [CH(CH3)CH2O], The number of [CH(CH3)CH2OCH2CH2O], [CH2CH(CH3)O] or [CH2CH2OCH2CH(CH3)O], the values ​​of a1 and a2 are similar or the same, a1 and a2 are 1-35, n represents the unit structure [CH2CH2CH2CH2O ] number, n=2-30. The polytetrahydrofuran-based block polyether diol of the present invention is liquid, easy to use and relatively low in preparation cost, and the polyurethane prepared by using it has properties and superior performance similar to that prepared by polytetrahydrofuran.

Description

technical field [0001] The invention relates to the field of polyether polyols for high-performance polyurethanes. Specifically, products made from PTMEG-PPG polyether glycols can be used in the fields of water emulsions, elastomers, coatings, sealants, adhesives, and the like. Background technique [0002] The type, functionality, molecular weight, and molecular structure of polyols such as polyester polyol, PTMEG, polycarbonate diol, and polyether alcohol determine the physical and chemical properties of polyurethane products, so the status of polyols in the synthetic formula becomes very important. The polyurethane products made of polytetrahydrofuran (PTMEG) have excellent properties, such as high hardness and good wear resistance. At the same time, it is recognized by everyone, but polytetrahydrofuran is solid at room temperature, which makes it inconvenient to use and expensive, making most manufacturers of polyurethane discouraged. Polytetrahydrofuryl polyether glyc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G65/32
Inventor 崔迎春束庆宇秦敦忠汤振英
Owner JIANGSU ZHONGSHAN CHEM
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