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Preparation method of polyether polyol for aliphatic coating

A polyether polyol and aliphatic technology, applied in the field of polyether polyol synthesis, can solve the problems of inability to achieve polymerization and high melting point, meet the application requirements and improve the hardness of the coating film

Active Publication Date: 2016-04-27
SHANDONG INOV NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pentaerythritol is in the form of solid powder at room temperature, with a melting point as high as 262°C. There are no reports and related products of pentaerythritol used as an initiator alone to prepare polyether, and the traditional polyether synthesis process cannot be used to achieve polymerization.

Method used

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  • Preparation method of polyether polyol for aliphatic coating
  • Preparation method of polyether polyol for aliphatic coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Add 408g of pentaerythritol and 60g of dimethyl sulfoxide into a 2L autoclave at room temperature, stir evenly, then add 3.6g of KOH, and perform nitrogen replacement. After the oxygen content in the autoclave is less than 100ppm, heat up to 100°C and stir for reaction 1h, then add 60g of propylene oxide to carry out polymerization, after stirring for 2h, remove the solvent dimethyl sulfoxide under vacuum at -0.09MPa, continue to feed 732g of propylene oxide, control the polymerization reaction temperature to 105°C, and the pressure to 0.15MPa. After completion, cool down to 80°C, add 7.7g of phosphoric acid and 36g of distilled water, stir for 40min, then add 1.2g of magnesium silicate, stir for 40min, vacuum dehydrate at -0.09MPa for 2 hours, filter to obtain polyether polyol 1, wait use.

[0024] (2) Add 600g of polyether polyol 1 and 0.24g of solid powder DMC catalyst to a 5L autoclave at room temperature, vacuum dehydrate at -0.09MPa for 40min, then feed 2400g ...

Embodiment 2

[0026] (1) Add 272g of pentaerythritol and 70g of acetonitrile into a 2L autoclave at room temperature, stir evenly, then add 4.2g of KOH, and carry out nitrogen replacement. After the oxygen content in the kettle is measured to be less than 100ppm, heat up to 80°C, stir for 1.5h, and then Add 56g of propylene oxide for polymerization. After stirring for 1 hour, remove the solvent acetonitrile under vacuum at -0.09MPa, continue to feed 1072g of propylene oxide, control the reaction temperature to 100°C, and the pressure to 0.2MPa. After the reaction is completed, cool down to 80°C. Add 9.00 g of phosphoric acid and 42 g of distilled water, stir for 40 min, then add 1.4 g of magnesium silicate, stir for 40 min, vacuum dehydrate at -0.09 MPa for 2 hours, filter to obtain polyether polyol 1, and set aside.

[0027] (2) Add 560g of polyether polyol 1 and 0.192g of emulsion DMC catalyst in a 5L autoclave at room temperature, vacuum dehydrate at -0.09MPa for 40min, then feed 2640g of...

Embodiment 3

[0029] (1) Add 204g of pentaerythritol and 45g of 1,3-dimethylimidazolidinone into a 2L autoclave at room temperature, stir well, then add 9g of KOH, and carry out nitrogen replacement. After the oxygen content in the autoclave is less than 100ppm, heat up to 70°C , stirred and reacted for 1h, then added 45g of propylene oxide to carry out polymerization, after stirred and reacted for 1.5h, the solvent 1,3-dimethylimidazolidinone was removed under vacuum at -0.09MPa, and 1251g of propylene oxide was continued to be fed, and the reaction temperature was controlled 110°C, pressure 0.1MPa, after the reaction, cool down to 80°C, add 19.27g of phosphoric acid and 45g of distilled water, stir for 40min, then add 1.5g of magnesium silicate, stir for 40min, vacuum dehydrate at -0.09MPa for 2 hours, filter The obtained polyether polyol 1 is ready for use.

[0030] (2) Add 500g of polyether polyol 1 and 0.075g of solid powder DMC catalyst into a 5L high-pressure reactor at room temperat...

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Abstract

The invention relates to a method for preparing a polyether polyol used for an aliphatic coating, belonging to the technical field of synthesis of polyether polyol. According to the method, only pentaerythritol is used as an initiator and reacts with alkylene oxide to prepare the polyether polyol with 4 degrees of functionality by adopting a two-stage polymerization process comprising solution polymerization and coordination polymerization. The polyether polyol prepared by adopting the method disclosed by the invention has the characteristics of high molecular weight, low un-saturation degree and narrow molecular weight distribution; the polyether polyol can substitute difunctional and trifunctional traditional polyether polyols available on the market to be applied to preparation of a polyurethane coating, so that the coating hardness, base material adhesive force, climate resistance and mechanical property of the polyurethane coating can be improved, and the application requirement of the high-performance polyurethane coating is met.

Description

technical field [0001] The invention relates to a preparation method of polyether polyol for aliphatic coatings, and belongs to the technical field of polyether polyol synthesis. Background technique [0002] Polyurethane coatings are reactive flexible polyurethane materials made of isocyanate and polyether polyols as the main raw materials and various additives. Therefore, the structure and quality of polyether polyols directly determine the application fields and mechanical performance indicators of polyurethane coatings. Traditional polyether polyols are mostly difunctional or trifunctional polyethers synthesized with propylene glycol or glycerol as the initiator under the condition of alkali metal catalysis. Due to the disproportionation reaction in the polymerization process, more unsaturated monohydric alcohols are produced. As a result, the mechanical properties of the prepared polyurethane materials are relatively poor; in recent years, low unsaturation and high mole...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G65/28C09D175/08
Inventor 刘军孙兆仁宁晓龙马海晶刘延良
Owner SHANDONG INOV NEW MATERIALS CO LTD
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