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 re

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0019] Example 1

[0020] Add 111.2g of dimer acid and 98.0g of polyethylene glycol with a molecular weight of 400 to a reactor equipped with a stirrer, condensation water separator, nitrogen protection, thermometer and heating mantle, and add 0.6276g of p-toluenesulfonic acid as a catalyst. , Gradually increase the temperature to 160°C, keep stirring during the heating process to fully mix the two components to obtain a light yellow transparent solution, control the reaction temperature to 160°C, and slowly reflux the reaction time for 2 hours; at this time, the water starts to be separated at room temperature. Then quickly increase the temperature to 180°C, keep it for 2 hours at this temperature, until the water is almost completely evaporated, continue to reflux for 0.5 hours, stop heating; when the temperature drops to 80°C, start vacuum distillation, the vacuum degree is 40mmHg, when When the temperature rises to 110°C, water and excess polyols and other small molecules begi...

Example Embodiment

[0021] Example 2

[0022] Add 74.0g of dimer acid and 29.7g of diethylene glycol into a reactor equipped with a stirrer, condensation water separator, nitrogen protection, thermometer and heating mantle, while adding 0.3106g of p-toluenesulfonic acid as a catalyst to gradually increase the temperature To 140°C, keep stirring 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 reaction kettle reaches 150°C, water It starts to be separated at room temperature, and then rapidly rises to 170~180℃, keeps the reaction at this temperature for 4 hours until all the water is evaporated, continue to reflux for 0.5 hours, stop heating; during the reaction, it can be measured every one hour Acid value, when the acid value no longer decreases, stop heating and start vacuum distillation when the temperature ...

Example Embodiment

[0023] Example 3

[0024] Add 93.3g of dimer acid and 37.6g of diethylene glycol into a reactor equipped with a stirrer, condensation water separator, nitrogen protection, thermometer and heating mantle, while adding 0.3912g of p-toluenesulfonic acid as a catalyst and 20ml Xylene is used as a water-carrying agent, and the temperature is gradually increased to 140°C, and the two components are stirred continuously during the heating process to obtain a light yellow transparent solution. The reaction temperature is controlled to 140°C, and the reaction time is slowly refluxed for 2 hours; continue heating when the reaction When the temperature of the kettle reaches 150°C, the water starts to be separated at room temperature, and then rapidly rises to 170°C. The reaction is kept at this temperature for 2 hours until the water is almost evaporated. Continue to reflux for 0.5 hours and stop heating; the temperature is reduced to Start vacuum distillation at 80°C, the vacuum degree is 4...

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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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