Polyether polyol refining method capable of reducing VOC (volatile organic compound) content and odor

The technology of a polyether polyol and a refining method is applied in the refining field of reducing the content and odor of volatile organic compounds in polyether polyol, which can solve the problems of expensive equipment and inability to completely remove the odor of polyether, and achieves the reduction of VOC content and effect of smell

Active Publication Date: 2017-04-26
江苏钟山新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Some manufacturers use falling film evaporators to purify polyether polyols, but th

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add 1000g of crude polyether polyol a (as described below) into a 2L stainless steel reaction kettle, add 10g of self-made adsorbent, start stirring and heat up to 100±5°C, then timed stirring for 1h. After cooling down to 80°C, inhale 80g of distilled water, keep the temperature at 80±5°C and stir for 1 hour, turn on the vacuum device and raise the temperature for dehydration, keep the temperature at 110±5°C for 2 hours, then filter to obtain the refined polyether polyol product.

[0017] In Example 1, polyether polyol a is prepared by reacting glycerol as an initiator with ethylene oxide, the molecular weight is 1500, and the amount of catalyst KOH is 0.25%.

[0018] The self-made adsorbent used in Example 1 is a mixture of magnesium silicate and aluminum silicate, wherein magnesium silicate accounts for 38% of the total mass of the adsorbent.

[0019] The product performance index that table 1 prepares

[0020] Test items Low VOC refining process Acid N...

Embodiment 2

[0022] Add 1000g of crude polyether polyol b (as described below) into a 2L stainless steel reaction kettle, add 12g of self-made adsorbent, start stirring and heat up to 105±5°C, then timed stirring for 1h. After cooling down to 90°C, inhale 100g of distilled water, keep the temperature at 90±5°C and stir for 1 hour, turn on the vacuum device and raise the temperature for dehydration, keep the temperature at 115±5°C for 2 hours, then filter to obtain the refined polyether polyol product.

[0023] In Example 2, polyether polyol b is prepared by reacting propylene glycol with propylene oxide, the molecular weight is 3000, and the amount of catalyst KOH is 0.3%.

[0024] The self-made adsorbent used in Example 2 is a mixture of magnesium silicate and aluminum silicate, wherein magnesium silicate accounts for 40% of the total mass of the adsorbent.

[0025] Table 2: Prepared product performance indicators

[0026] Test items Low VOC refining process Acid Neutralizat...

Embodiment 3

[0028] Add 1000g of crude polyether polyol c (as described below) into a 2L stainless steel reaction kettle, add 15g of self-made adsorbent, start stirring and heat up to 110±5°C, then timed stirring for 1h. After cooling down to 90°C, inhale 100g of distilled water, keep the temperature at 90±5°C and stir for 1 hour, turn on the vacuum device and raise the temperature for dehydration, keep the temperature at 115±5°C for 2 hours, then filter to obtain the refined polyether polyol product.

[0029] In Example 3, polyether polyol c is prepared by reacting glycerol and pentaerythritol with an average functionality of 3.5 and a mixture of propylene oxide and ethylene oxide, wherein ethylene oxide accounts for ethylene oxide ring 15% of the total mass of oxypropane, the molecular weight is 3000, and the amount of catalyst KOH is 0.3%.

[0030] The self-made adsorbent used in Example 3 is a mixture of magnesium silicate and aluminum silicate, wherein magnesium silicate accounts for ...

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PUM

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Abstract

The invention relates to a posttreatment method capable of reducing the VOC (volatile organic compound) content and odor of polyether polyol. The polyether polyol is prepared from an initiating agent and oxyalkylene through reaction under the effect of an alkali metal catalyst. The method is characterized in that an adsorbent accounting for 1.0 to 1.5 percent of the total mass of coarse polyether polyol is added at 80 to 120 DEG C; after stirring and adsorption, the temperature is lowered to 80 to 90 DEG C; then, water accounting for 8 to 10 percent of the total mass of the coarse polyether polyol is added; next, after secondary stirring, a vacuum system is started; meanwhile, temperature rise is performed for removing water and low-boiling point substances in the coarse polyether polyol; after the moisture is qualified through analysis, filter pressing is performed to obtain a finished product. The potassium-sodium ions are enabled to be adsorbed and removed; meanwhile, the odor and the VOC content of the polyether polyol are reduced.

Description

technical field [0001] The invention relates to a refining method for reducing the content and odor of volatile organic compounds (VOC) in polyether polyols. Background technique [0002] Polyether polyols are important raw materials for polyurethane materials, which are widely used in the automotive industry. As people are paying more and more attention to environmental protection and health, the smell in the car is required to be low. The automotive polyurethane material made of ordinary polyether has a certain smell, which is mainly the smell of some aldehydes after testing. This is because the synthesis of polyether polyols basically uses small molecule polyols or amines as initiators, and uses alkali metal catalysts to catalyze ring-opening polymerization of propylene oxide or ethylene oxide to form macromolecular polymers. Polyether polyols after polymerization Alcohol contains catalyst metal ions, unreacted monomers and oligomers, so it needs to be purified to remove...

Claims

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Application Information

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IPC IPC(8): C08G65/30C08G65/26C08G18/48
CPCC08G18/48C08G18/4833C08G65/2609C08G65/30
Inventor 宗红亮俞中锋叶丞张丽君申宝兵
Owner 江苏钟山新材料有限公司
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