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Dimer acid polyester polyhydric alcohols and preparation thereof

A dimer acid polyester and polyol technology, applied in the direction of organic chemistry and the like, can solve the problems of low molecular weight of polyester polyol products, limited application scope, and many by-products, etc., and achieves few intermediate steps, low cost, and conversion. high rate effect

Inactive Publication Date: 2008-06-25
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process has gone through steps such as alcoholysis, thermal polymerization, distillation, transesterification and recovery of excess alcohol. The process is relatively complicated, and there are many by-products. The relative molecular weight of the obtained polyester polyol product is low, and the scope of application is limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 111.2 g of dimer acid and 98.0 g of polyethylene glycol with a molecular weight of 400 into a reaction kettle equipped with a stirrer, condensation water separator, nitrogen protection, thermometer and heating mantle, and simultaneously add 0.6276 g of p-toluenesulfonic acid as a catalyst , gradually raised the temperature to 160°C, and kept stirring during the heating process, so that the two components were fully mixed to obtain a light yellow transparent solution. The reaction temperature was controlled at 160°C, and the reaction time was slowly refluxed for 2 hours. Then rapidly raise the temperature to 180°C, and keep it warm at this temperature for 2 hours, until the water is basically completely evaporated, continue to reflux for 0.5 hours, and stop heating; when the temperature drops to 80°C, start vacuum distillation, and the vacuum degree is 40mmHg. When the temperature rises to 110°C, small molecular substances such as water and excess polyols begin to be ...

Embodiment 2

[0022] Add 74.0g of dimer acid and 29.7g of diethylene glycol into a reaction kettle equipped with a stirrer, condensation and water separation device, nitrogen protection, thermometer and heating mantle, and at the same time add 0.3106g of p-toluenesulfonic acid as a catalyst to gradually increase the temperature to 140°C, stirring continuously during the heating process to fully mix the two components to obtain a light yellow transparent solution, control the reaction temperature to 140°C, and slowly reflux the reaction time for 1 hour; continue heating when the temperature of the reactor reaches 150°C, water It begins to be separated at room temperature, then rapidly rises to 170-180°C, keeps the temperature at this temperature for 4 hours until the water is basically evaporated, continues to reflux for 0.5 hours, and stops heating; during the reaction, it can be measured once every hour Acid value, when the acid value no longer decreases, stop heating, and start vacuum dist...

Embodiment 3

[0024] Add 93.3g of dimer acid and 37.6g of diethylene glycol into a reaction kettle equipped with a stirrer, condensation water separator, nitrogen protection, thermometer and heating mantle, and simultaneously add 0.3912g of p-toluenesulfonic acid as a catalyst and 20ml Xylene is used as a water-carrying agent, and the temperature is gradually raised to 140°C. During the heating process, the two components are fully mixed to obtain a light yellow transparent solution. The reaction temperature is controlled at 140°C, and the reaction time is slowly refluxed for 2 hours; When the temperature of the kettle reaches 150°C, the water begins to be separated at room temperature, and then the temperature rises rapidly to 170°C. At this temperature, the reaction is kept for 2 hours until the water is basically completely evaporated, and the reflux is continued for 0.5 hours, and the heating is stopped; the temperature is lowered to Start vacuum distillation at 80°C with a vacuum of 40m...

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PUM

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Abstract

The invention discloses a priplast and a preparation method thereof. The priplast has an acid value ranging from 0.5 to 4mgKOH / g and a hydroxyl value ranging from 60 to 500mgKOH / g. The preparation method is characterized by a simple and convenient operation and stable product performances. In the preparation method of the invention, the dimer acid reacts with the polyol under the protection of the nitrogen under the circumstance of the existence of a catalyst and a water-carrying agent and finally the small molecule substances are removed by steaming on the condition of the vacuum distillation and the tannish priplast is obtained after the product is cooled down under the vacuum state.

Description

technical field [0001] The invention relates to a polyol and a preparation method thereof, more specifically to a dimer acid polyester polyol and a preparation method thereof. Background technique [0002] Polymer polyol is one of the main raw materials for synthesizing polyurethane. It is generally divided into polyether type and polyester type. High mechanical strength has an advantage, so it has been developed in products such as polyurethane foam materials, synthetic leather, coatings, adhesives, and elastomers. Especially in the polyether polyurethane rigid foam materials that have been widely used in recent years, adding a certain proportion of polyester polyol can greatly increase the strength of the material, thereby significantly reducing the production cost of polyurethane rigid foam materials; Foam materials have low thermal conductivity and excellent thermal insulation properties, and are currently widely used in pipeline insulation and building insulation. [...

Claims

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Application Information

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IPC IPC(8): C08G63/12C07C69/34C08G18/42
Inventor 姚成马驰
Owner NANJING UNIV OF TECH
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