Low hydroxyl value tung oil polyol and preparation method thereof

A tung oil polyol, low hydroxyl value technology, applied in the field of polyurethane materials, can solve the problems of easy side reactions, high reactivity of epoxy groups, poor selectivity, etc., to avoid cross-linking side reactions, renewable raw materials, biological good degradability

Active Publication Date: 2017-09-12
CHINA PETROLEUM & CHEM CORP +1
View PDF6 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, tung oil is used to prepare high-quality vegetable oil polyols. Because tung oil has a high degree of unsaturation and is the only unsaturated vegetable oil with conjugated double bonds in nature, the iodine value reaches more than 170, and more than 85% of the unsaturated bonds are Carbon-carbon conjugated triene bonds, so the presence of conjugated double bonds in tung oil in the process of preparing polyol epoxidation makes the epoxy group highly reactive, poor in selectivity, and prone to side reactions, thereby generating macromolecular cross-links. Co-product, resulting in a sharp increase in viscosity, usually soli

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Low hydroxyl value tung oil polyol and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 500g of tung oil, 80g of formic acid (85wt% solution), 0.5g of concentrated sulfuric acid, and 150g of n-hexanoic acid into a 2000mL three-neck flask, heat up to 40°C and stir well. Then, 325g of 30wt% hydrogen peroxide solution was slowly added dropwise under vigorous stirring, and the rate of addition was controlled to keep the reaction temperature at about 50°C. After the reaction system was separated into layers, the water phase was removed, and the oil phase was washed with 10 wt% sodium bicarbonate aqueous solution until neutral, and then the product was washed with hot water at 70°C for 3 times. The washed product was distilled at 2000 Pa and 80°C for 2 hours to obtain tung oil polyol.

[0029] Take 250g of the above-prepared tung oil polyol, add 1.25g of sodium hydroxide into the reaction kettle and mix evenly, gradually raise the temperature to 120°C under the protection of nitrogen, add 760g of propylene oxide within 7.5h, and then continue the reaction fo...

Embodiment 2

[0031] Add 500g of tung oil, 100g of formic acid (85wt% solution), 0.25g of concentrated sulfuric acid, and 250g of n-hexanoic acid into a 2000mL three-neck flask, heat up to 45°C and stir well. Then, 380g of 30wt% hydrogen peroxide solution was slowly added dropwise under vigorous stirring conditions, and the dropping rate was controlled to keep the reaction temperature at about 65°C. After the reaction system was separated into layers, the water phase was removed, and the oil phase was washed with 10 wt% sodium bicarbonate aqueous solution until neutral, and then the product was washed with hot water at 70°C for 3 times. The washed product was distilled at 2000 Pa and 80°C for 2 hours to obtain tung oil polyol.

[0032] Take 250g of the above-prepared tung oil polyol, add 1.25g of potassium hydroxide into the reaction kettle and mix evenly. After gradually raising the temperature to 140°C under the protection of nitrogen, add 760g of ethylene oxide within 7.5h, then continue...

Embodiment 3

[0034] Add 500g of tung oil, 55g of formic acid (85wt% solution), 4g of concentrated sulfuric acid, and 100g of n-hexanoic acid into a 2000mL three-neck flask, heat up to 35°C and stir well. Then, 285g of 30wt% hydrogen peroxide solution was slowly added dropwise under vigorous stirring, and the dropping rate was controlled to keep the reaction temperature at about 40°C. After the reaction system was separated into layers, the water phase was removed, and the oil phase was washed with 10 wt% sodium bicarbonate aqueous solution until neutral, and then the product was washed with hot water at 70°C for 3 times. Distill the washed product at 1000-3000Pa and 80°C for 2h to obtain tung oil polyol.

[0035] Take 250g of the above-prepared tung oil polyol, add 1.25g of lithium hydroxide into the reaction kettle and mix evenly. After gradually raising the temperature to 90°C under the protection of nitrogen, add 510g of butylene oxide within 5h, and then continue the reaction for 6h to...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Hydroxyl valueaaaaaaaaaa
Viscosityaaaaaaaaaa
Acid valueaaaaaaaaaa
Login to view more

Abstract

The invention discloses a low hydroxyl value tung oil polyol preparation method, which comprises: (1) mixing tung oil, carboxylic acid, a catalyst and a hydroxylating reagent according to a certain ratio, heating to a temperature of 35-45 DEG C, adding a hydrogen peroxide solution in a dropwise manner under a vigorous stirring condition, maintaining the reaction temperature at 40-65 DEG C, maintaining the reaction temperature for 3-5 h after completing the adding, carrying out standing layering after completing the reaction, separating to obtain a water phase, neutralizing, carrying out water washing, and carrying out pressure reducing distillation to obtain tung oil polyol; and (2) mixing the tung oil polyol prepared in the step (1) and an alkaline catalyst according to a certain ratio, heating to a temperature of 90-140 DEG C, adding an epoxide, carrying out a polymerization reaction, and after completing the reaction, carrying out acid neutralizing, water washing and pressure reducing distillation to obtain the low hydroxyl value tung oil polyol. According to the present invention, the prepared low hydroxyl value tung oil polyol has the hydroxyl value of 30-100 mgKOH/g, the acid value of less than 1.0 mgKOH/g, the moisture content of less than 0.1 wt% and the yield of more than 90%, and is suitable for the preparation of polyurethane soft foam materials, polyurethane elastomers, and the like.

Description

technical field [0001] The invention belongs to the field of polyurethane materials, and in particular relates to a low-hydroxyl value tung oil polyol and a preparation method thereof. Background technique [0002] Polyurethane materials have been widely used in industry and people's daily life due to their good mechanical properties and easy molding. The main raw materials used to produce polyurethane include isocyanates, polyols and other additives, of which polyols account for more than 50%. In the process of industrial production, polyols are mainly used in the field of polyurethane, so the factors affecting the polyurethane industry are also the main factors affecting the polyol market. Polyols can be divided into polyether polyols and polyester polyols according to their molecular structure. Among them, polyether polyols dominate the market, accounting for more than 70% of the entire polyol demand. [0003] Typically, polyols are prepared from petroleum. As a non-re...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C07C67/31C07C69/675C08G18/36
CPCC07C67/31C08G18/36C08G2110/0008C07C69/675
Inventor 李澜鹏李志瑞白富栋乔凯王领民
Owner CHINA PETROLEUM & CHEM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap