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A kind of preparation method of low odor polyether polyol

A polyether polyol, low-odor technology, applied in the field of polyether polyol production, can solve problems such as increasing costs, and achieve the effects of low monool content, reduced unsaturation, and low metal content

Active Publication Date: 2022-04-22
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN 108059717 reports the implementation of adding a compound antioxidant to the crude polyether to suppress the formation of by-products, which can significantly reduce the aldehydes, but the antioxidant introduced by this method reaches 0.1%, which improves to a certain extent cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] In the following example, 38.5g of propylene glycol and 1.0g of potassium hydroxide were put into a stainless steel reactor, reacted for 1h, and then 80g of toluene was put into the system, and the water and toluene in the system were removed at 90°C. First, 77.65g of propylene oxide is put into the pre-polymerization at one time. After the reaction pressure is lower than 0.05MPa, 0.5g of dimethyl azobisisobutyrate is put in under the protection of nitrogen, and the remaining 883.85g of propylene oxide is continuously put into the reaction. After completion, vacuumize to remove unreacted monomers to obtain crude polyether. Pass the crude polyether through -SO 3 The adsorption tower filled with H-type perfluorosulfonic acid resin is kept at 90°C and the residence time is 60min; the product is degassed under reduced pressure at 90°C and gauge pressure 0.02KPa for 2 hours, and then heated to 110°C for 2 hours under reduced pressure. , and then filtered to obtain a refined...

Embodiment 2

[0047] In the following examples, put 31g of glycerin and 4.8g of potassium hydroxide into a stainless steel reactor, react for 1h, then put in 70g of toluene, remove water and toluene in the system at 90°C, replace with nitrogen three times, at 120°C, First, put 60g of propylene oxide into the pre-polymerization at one time. After the reaction pressure is lower than 0.05MPa, put in 1.5g of benzoyl peroxide under the protection of nitrogen, and put the remaining 909g of propylene oxide into the reaction continuously. After the reaction is completed, vacuumize the unreacted The monomer is removed to obtain crude polyether. Pass the crude polyether through -SO 3 The adsorption tower filled with H-type perfluorosulfonic acid resin is kept at 100°C and the residence time is 70min; the product is degassed under reduced pressure at 100°C and gauge pressure 0.02KPa for 2 hours, and then heated to 120°C for 2 hours under reduced pressure. , and then filtered to obtain a refined polye...

Embodiment 3

[0049] In the following examples, put 15.5g of glycerin and 10g of potassium hydroxide into a stainless steel reactor, react for 1 hour, then put in 70g of toluene, remove water and toluene in the system at 90°C, replace with nitrogen three times, , first put 95g of the mixture of propylene oxide and ethylene oxide at one time, the molar ratio of propylene oxide and ethylene oxide is 2:1, carry out pre-polymerization, wait for the reaction pressure to be lower than 0.05MPa, put in 1.9 g azobisisobutyronitrile, the remaining 889.5 g of propylene oxide and ethylene oxide mixture were continuously put into reaction, after the reaction was completed, the unreacted monomers were removed by vacuuming to obtain crude polyether. Pass the crude polyether through -SO 3 The adsorption tower filled with H-type perfluorosulfonic acid resin is kept at 120°C and the residence time is 90min; the product is degassed under reduced pressure at 100°C and gauge pressure 0.1KPa for 2 hours, and the...

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PUM

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Abstract

The invention relates to a preparation method of low-odor polyether polyol, which comprises the following steps: 1) After adding an initiator and a catalyst into a reaction kettle, adding an azeotropic solvent, and azeotropically removing moisture in the system, continuing heating, Remove the azeotropic solvent in the system; 2) feed the epoxy compound, preferably propylene oxide or ethylene oxide, at a temperature of 80-140°C, preferably 90-120°C, and put in the total amount of the epoxy compound at one time 5% to 10% of the polyether polyol is pre-polymerized, and the reaction generates polyether polyol a; 3) The gauge pressure to be reacted is lower than 0.05MPa, and a free radical initiator is added under the protection of nitrogen, and stirred evenly; 4) Continue to feed the epoxy compound, continue A polymerization reaction is carried out to obtain a crude polyether. The preparation method of the present invention can effectively reduce the degree of unsaturation of polyether, adopt strong acidic polymers to absorb alkali metal ions, avoid conventionally used acid neutralization and filtration processes, obtain extremely low metal content, reduce odor, and have low production costs .

Description

technical field [0001] The invention belongs to the technical field of polyether polyol production, in particular to a preparation method of low-odor polyether polyol. Background technique [0002] The industrial production of polyether polyols generally adopts two production processes, one is potassium hydroxide catalyzed process, which forms potassium alcoholate from potassium hydroxide and initiator, and then passes through ethylene oxide or propylene oxide or two The mixture of the former is subjected to anionic ring-opening polymerization to generate polyether polyol; the other is a bimetallic catalytic process, which uses a dicyanometallic compound as a catalyst to form a complex with ethylene oxide or epoxy Propane or a mixture of the two undergoes ring-opening polymerization to form polyether polyols. [0003] The polyether produced by the potassium hydroxide catalytic process, under strong alkaline conditions, isopropyl alcohol with propylene oxide as the terminal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G65/30C08G65/28
CPCC08G65/30C08G65/2609
Inventor 王艳丽徐丹金振宇齐旺顺蒋尧尧孙永旭贺信淳张宏科
Owner WANHUA CHEM GRP CO LTD
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