Method for preparing vegetable oil polyhydric alcohol by using natural reproducible source

Abstract

The invention relates to a method of preparing vegetable oil polylol by using natural renewable resources. Epoxy soybean oil, a solvent, methanol, water and a catalyst are added performed autoclave, wherein, the proportion by weight of the epoxy soybean oil, the solvent, anhydrous methanol, water and the catalyst is 10:1 to 10:1 to 12:1 to 6:1 to 4, the reaction temperature ranges from 100 DEG C to 160 DEG C, and the optimized temperature ranges from 120 DEG C to 160 DEG C. The reaction pressure is self pressure, and the reaction is completed after reacting for 12 to 20 hours through stirring. The method has the advantages of no pollution, simple processing procedure after the reaction, and mild reaction conditions.

Description

technical field

[0001] The invention belongs to a method for preparing polyols, in particular to a method for preparing vegetable oil polyols using natural renewable resources, technical background

[0002] Polyols are an important chemical intermediate, widely used in food, cosmetics, sanitary products, chemical industry and medicine. Especially in the polyurethane industry, it has been widely used as the main raw material. Most of the polyols currently used in the polyurethane industry come from fossil resources such as petroleum. In recent years, due to the limitation of fossil resources such as petroleum and the increasing demand for resources, the use of renewable natural resources to replace fossil resources has become a worldwide research. hotspot.

[0003] Vegetable oil polyols are prepared by chemically modifying the double bonds of vegetable oils and introducing hydroxyl groups. They are cheap, highly functional, and polymerized products have excellent physical a...

Examples

Embodiment 1

[0021] Add 20g of epoxidized soybean oil, 1.0g of NaI and 24g of methanol, 2g of acetone, and 2.0g of water into an autoclave with a volume of 100ml equipped with a magnetic stirrer, a ventilation tube and a sampling tube, heat up to 120°C, and react for 20h After discharge, an orange-yellow liquid was obtained, and the product was analyzed and tested.

[0022] The epoxy value of the epoxidized soybean oil is 0.376, and the epoxy value of the product measured after the reaction is 0.176, the hydroxyl value is 102.1 mg KOH / g, and the reaction conversion rate is 53.2%. The product is analyzed by infrared spectroscopy, as can be seen from the figure that the product is at 3400cm -1 The characteristic absorption seal of hydroxyl groups appears on the left and right, 840cm -1 and 820cm -1 The characteristic peak of the epoxy group at the place disappears, thus confirming that the product is a vegetable oil polyol.

Embodiment 2

[0024] Add 20g epoxy soybean oil, 2.0g tetramethylammonium iodide and 16g methyl alcohol, 4g methyl ethyl ketone, 2.0g water in the autoclave that is furnished with the volume of 100ml of magnetic stirring, air pipe and sampling tube, be warming up to After reacting for 20 hours at 120°C, the material was discharged to obtain an orange-yellow liquid, and the product was analyzed and tested. The epoxy value of the epoxidized soybean oil is 0.376, and the epoxy value of the product measured after the reaction is 0.097, the hydroxyl value is 142.5mg KOH / g, and the reaction conversion rate is 74.2%.

Embodiment 3

[0026] Add 20g epoxy soybean oil, 3.0g ZnI 2 And 12g of methanol, 8g of N,N-dimethylformamide, 4.0g of water, heated up to 140°C, reacted for 20h, and discharged to obtain an orange-yellow liquid, which was analyzed and tested. The epoxy value of the epoxidized soybean oil is 0.376, and the epoxy value of the product measured after the reaction is 0.193, the hydroxyl value is 93.4 mg KOH / g, and the reaction conversion rate is 48.7%.

technical field

[0001] The invention belongs to a method for preparing polyols, in particular to a method for preparing vegetable oil polyols using natural renewable resources, technical background

[0002] Polyols are an important chemical intermediate, widely used in food, cosmetics, sanitary products, chemical industry and medicine. Especially in the polyurethane industry, it has been widely used as the main raw material. Most of the polyols currently used in the polyurethane industry come from fossil resources such as petroleum. In recent years, due to the limitation of fossil resources such as petroleum and the increasing demand for resources, the use of renewable natural resources to replace fossil resources has become a worldwide research. hotspot.

[0003] Vegetable oil polyols are prepared by chemically modifying the double bonds of vegetable oils and introducing hydroxyl groups. They are cheap, highly functional, and polymerized products have excellent physical a...

Examples

Embodiment 1

[0021] Add 20g of epoxidized soybean oil, 1.0g of NaI and 24g of methanol, 2g of acetone, and 2.0g of water into an autoclave with a volume of 100ml equipped with a magnetic stirrer, a ventilation tube and a sampling tube, heat up to 120°C, and react for 20h After discharge, an orange-yellow liquid was obtained, and the product was analyzed and tested.

[0022] The epoxy value of the epoxidized soybean oil is 0.376, and the epoxy value of the product measured after the reaction is 0.176, the hydroxyl value is 102.1 mg KOH / g, and the reaction conversion rate is 53.2%. The product is analyzed by infrared spectroscopy, as can be seen from the figure that the product is at 3400cm -1 The characteristic absorption seal of hydroxyl groups appears on the left and right, 840cm -1 and 820cm -1 The characteristic peak of the epoxy group at the place disappears, thus confirming that the product is a vegetable oil polyol.

Embodiment 2

[0024] Add 20g epoxy soybean oil, 2.0g tetramethylammonium iodide and 16g methyl alcohol, 4g methyl ethyl ketone, 2.0g water in the autoclave that is furnished with the volume of 100ml of magnetic stirring, air pipe and sampling tube, be warming up to After reacting for 20 hours at 120°C, the material was discharged to obtain an orange-yellow liquid, and the product was analyzed and tested. The epoxy value of the epoxidized soybean oil is 0.376, and the epoxy value of the product measured after the reaction is 0.097, the hydroxyl value is 142.5mg KOH / g, and the reaction conversion rate is 74.2%.

Embodiment 3

[0026] Add 20g epoxy soybean oil, 3.0g ZnI 2 And 12g of methanol, 8g of N,N-dimethylformamide, 4.0g of water, heated up to 140°C, reacted for 20h, and discharged to obtain an orange-yellow liquid, which was analyzed and tested. The epoxy value of the epoxidized soybean oil is 0.376, and the epoxy value of the product measured after the reaction is 0.193, the hydroxyl value is 93.4 mg KOH / g, and the reaction conversion rate is 48.7%.