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Refining method for reducing aldehyde content and odor of polyether polyol

A technology of polyether polyol and refining method, which is applied in the direction of separation by moving adsorbent, can solve the problems of high odor and high aldehyde content of polyether polyol, and achieve the goal of reducing aldehyde content, increasing yield and reducing residual amount Effect

Active Publication Date: 2020-10-13
WANHUA CHEMYANTAI RONGWEI POLYURETHANE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on the described shortcomings of the prior art, the present invention aims to solve the problems of high polyether polyol aldehyde content and large odor in the prior art

Method used

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  • Refining method for reducing aldehyde content and odor of polyether polyol
  • Refining method for reducing aldehyde content and odor of polyether polyol
  • Refining method for reducing aldehyde content and odor of polyether polyol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042]Add 1000g of crude polyether polyol 1 into a 2L stainless steel reaction kettle. At this time, when the temperature is 30°C, add 20g of deionized water, and raise the temperature to about 80°C while stirring. After stirring for 30min, add synthetic magnesium silicate adsorbent 2g, 0.5g of activated carbon, keep the temperature at about 80°C, stir for 60min, and press filter for 20min to measure the content of potassium ion and sodium ion in the polyether polyol product after press filtration, respectively 2ppm and 1ppm, add antioxidant 1010 About 0.3g, after stirring for 10 minutes, turn on the vacuum device and raise the temperature for dehydration, keep the temperature at 115°C, dehydrate until the moisture content is ≤0.05wt%, the dehydration is completed and the refined polyether polyol product 1 is obtained, the index and VOC content of the product are tested, and the results are shown in in FIG. 1.

Embodiment 2

[0044] Add 1000g of crude polyether polyol 2 into a 2L stainless steel reaction kettle. When the temperature is 50°C, add 30g of deionized water and raise the temperature to about 90°C while stirring. After stirring for 60min, add 5g of synthetic magnesium silicate adsorbent. Activated carbon adsorbent 2g, keep the temperature at about 85°C, stir for another 70min, and press filter for 20min to measure the content of potassium ion and sodium ion in the product after press filtration, respectively 1ppm and 1ppm, add about 0.5g of antioxidant 1010, stir After 10 minutes, turn on the vacuum device and raise the temperature for dehydration. Keep the temperature at 120°C. When the dehydration reaches a moisture content of ≤0.05wt%, the dehydration is completed to obtain the finished product 2 of polyether polyol. The index and VOC content of the product are tested, and the results are shown in Table 1.

Embodiment 3

[0046] Add 1000g of crude polyether polyol 3 into a 2L stainless steel reaction kettle. When the temperature is 80°C, add 50g of deionized water, and raise the temperature to about 95°C while stirring. After stirring for 60min, add 5g of synthetic magnesium silicate adsorbent. Activated carbon adsorbent 2.5g, keep the temperature at about 95°C, stir for another 60min, and press filter for 20min after circulating to measure the content of potassium ion and sodium ion of the product after press filtration are 2ppm and 0ppm respectively, add about 1.5g of antioxidant 1010, After stirring for 10 minutes, turn on the vacuum device and raise the temperature for dehydration. Keep the temperature at 115 ° C. When the dehydration reaches a moisture content of ≤0.35 wt%, the dehydration is completed to obtain the refined polyether polyol product 3. The indicators and VOC content of the product are tested, and the results are shown in Table 1.

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Abstract

The invention relates to a refining method for reducing aldehyde content and odor of polyether polyol. The refining method comprises the following steps: 1) adding water accounting for 0.1-10.0% of the total mass of crude polyether polyol into the crude polyether polyol at 25-100 DEG C, and carrying out uniform mixing; 2) adding an adsorbent accounting for 0.1-3% of the total mass of the crude polyether polyol into the polyether polyol obtained in the step 1), controlling an adsorption temperature to be 80-130 DEG C, carrying out filter pressing circulation after adsorption equilibrium, and testing the contents of potassium and sodium ions in the polyether polyol having undergone filter pressing; 3) repeating the step 2 until the contents of potassium and sodium ions in the polyether polyol are less than required contents; 4) adding a desired amount of an antioxidant into the polyether polyol obtained in the step 3); and 5), carrying out heating and vacuum dehydration to obtain refinedpolyether polyol. The method can reduce both aldehyde content and odor.

Description

technical field [0001] The invention relates to the technical field of polyether polyol preparation, in particular to a refining method for reducing aldehyde content and odor in polyether polyol. Background technique [0002] Polyether polyol is one of the main raw materials for the synthesis of polyurethane resin, widely used in polyurethane foam, polyurethane coating, polyurethane adhesive, polyurethane elastomer and other fields. At present, with the improvement of people's living standards, people have higher and higher requirements for environmental protection and physical health. At present, the odor problem of polyether polyols is still outstanding. The odor of polyether polyols mainly comes from aldehydes such as formaldehyde, acetaldehyde, and acrolein. Although the content of these aldehydes in polyether polyols is usually low, they However, it has a huge impact on the odor of polyether polyols. At present, all polyether manufacturers are looking for effective met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/30B01D15/02
CPCC08G65/30B01D15/02
Inventor 马爱勤蔡仲铭王新宇朱霞林徐薇陈雯慧
Owner WANHUA CHEMYANTAI RONGWEI POLYURETHANE CO LTD
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