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Method for preparing castor oil-based polysiloxane polyol

A technology based on polysiloxane and castor oil, which is applied in the field of preparation of polysiloxane polyols as intermediates of polymer materials, and can solve problems such as poor hydrolysis resistance, high cost, and low reactivity

Active Publication Date: 2012-05-02
兰州科天水性科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing castor oil-based polysiloxane polyols, to overcome the problems of low reactivity, poor hydrolysis resistance, and high cost of existing polysiloxane diols, and improve the performance of siloxane modification at the same time. mechanical properties of copolymers

Method used

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  • Method for preparing castor oil-based polysiloxane polyol
  • Method for preparing castor oil-based polysiloxane polyol
  • Method for preparing castor oil-based polysiloxane polyol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 198g of castor oil above into a 500mL three-necked flask, and then add 87.8g of pentamethyldisiloxane, add 0.8mL of chloroplatinic acid solution when the temperature rises to 80°C, continue to heat up to 100°C and react at 100°C for 5h. The unreacted pentamethyldisiloxane was distilled off under reduced pressure to obtain 272.3 g of castor oil hydrosilylation product.

[0020] 272.3g castor oil hydrosilylation product and 467g octamethylcyclotetrasiloxane (D 4 ) into a dry 1000mL three-necked flask equipped with a thermometer, a condenser and stirring, then added 3.62g of concentrated sulfuric acid, and reacted at 45°C for 48h; the product was washed with deionized water and distilled under reduced pressure to obtain 598g of castor oil-based polymer Silicone polyol.

Embodiment 2

[0022] Add the above-mentioned 198g of castor oil into a 500mL three-necked flask, then add 87.8g of pentamethyldisiloxane, add 0.8mL of chloroplatinic acid solution when the temperature rises to 80°C, continue to heat up to 100°C and react at 100°C for 5h, after reducing The unreacted pentamethyldisiloxane was distilled off under pressure to obtain 272.3 g of castor oil hydrosilylation product.

[0023] With 272.3g castor oil hydrosilylation product and 700g octamethylcyclotetrasiloxane (D 4 ) into a dry 1000mL three-necked flask equipped with a thermometer, condenser and stirring, then added 4.8g of concentrated sulfuric acid, and reacted at 45°C for 60h; the product was washed with deionized water, and 885g of castor oil-based poly Silicone polyol.

Embodiment 3

[0025] Add the above 198g castor oil into a 500mL three-necked flask, then add 87.8g pentamethyldisiloxane, add 0.8mL silicene complex platinum catalyst when the temperature rises to 80°C, continue to heat up to 100°C and react at 100°C for 5h. , The pentamethyldisiloxane that did not participate in the reaction was removed by distillation under reduced pressure to obtain 272.3 g of castor oil hydrosilylation product.

[0026] With 272.3g castor oil hydrosilylation product and 1300g octamethylcyclotetrasiloxane (D 4 ) into a dry 2000mL three-necked flask equipped with a thermometer, a condenser and stirring, then added 7.7g of concentrated sulfuric acid, and reacted at 45°C for 72h; the product was washed with deionized water, and 1380g of castor oil-based polymer was obtained by distillation under reduced pressure. Silicone polyol.

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Abstract

The invention discloses a method for preparing castor oil-based polysiloxane polyol, comprising the following technical steps of: firstly preparing castor oil hydrosilylation products through hydrosilylation reaction of castor oil and 5-methyl-disiloxane, then carrying out acid catalyzed ring opening reaction on the castor oil hydrosilylation products and cyclic siloxane, and preparing the castoroil-based polysiloxane polyol. The synthesis process is simple, the cost is lower, and the castor oil-based polysiloxane polyol has higher practical value. Meanwhile, a siloxane chain is positioned at a side chain of the castor oil, when polyurethane, polyester, and the like are introduced, siloxane is easy to migrate to the surface, and the materials having better surface performance. The siloxane chain of the castor oil-based polysiloxane polyol is positioned at the side chain of a molecule, the mechanical performance of polysiloxane can be improved, the surface energy of the materials is greatly reduced on condition that the mechanical performance of the materials is not reduced, the water resistance of the materials is enhanced, and the castor oil-based polysiloxane polyol is suitablefor synthesizing water-based polyurethane materials.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of polymer material intermediate polysiloxane polyols, and in particular relates to a preparation method of castor oil-based polysiloxane polyols. Background technique [0002] Due to the presence of terminal hydroxyl groups in polysiloxane polyols, they are often used as intermediates to prepare various materials such as polyurethanes and polyesters. Materials prepared with siloxane diols as intermediates have excellent water resistance, aging resistance, surface properties and good biocompatibility, etc., and thus have been widely used in many fields. [0003] Chinese patent CN90105777.0 provides a method for preparing low-molecular-weight α, ω siloxane diols. Under the action of an acidic catalyst, the alkoxysilane is hydrolyzed twice, so that the two ends of the siloxane have hydroxyl functional groups. Due to the poor stability of the hydroxyl group directly connected with siloxa...

Claims

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Application Information

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IPC IPC(8): C08G77/06C08G18/61
Inventor 戴家兵李维虎
Owner 兰州科天水性科技有限公司
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