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Vegetable oil-based polyol, preparation method thereof, thermocuring vegetable oil-based polyurethane, and preparation method and application of thermocuring vegetable oil-based polyurethane

A vegetable oil-based, polyol-based technology, applied in polyurea/polyurethane coatings, polyurea/polyurethane adhesives, applications, etc., can solve problems such as adverse environmental effects and complicated preparation methods, and achieve improved mechanical properties and cross-linking density High, improve the effect of tensile strength and toughness

Active Publication Date: 2022-08-05
SOUTH CHINA AGRI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the tung oil polyol prepared by this method has a higher hydroxyl value, its preparation method is more complicated, and it needs to use aldehyde reagents, which have great adverse effects on the human body and the environment.

Method used

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  • Vegetable oil-based polyol, preparation method thereof, thermocuring vegetable oil-based polyurethane, and preparation method and application of thermocuring vegetable oil-based polyurethane
  • Vegetable oil-based polyol, preparation method thereof, thermocuring vegetable oil-based polyurethane, and preparation method and application of thermocuring vegetable oil-based polyurethane
  • Vegetable oil-based polyol, preparation method thereof, thermocuring vegetable oil-based polyurethane, and preparation method and application of thermocuring vegetable oil-based polyurethane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The preparation process of the castor oil-based polyol of the present embodiment is as follows:

[0044] (1) Put 152.5 g of diethanolamine (DEA) and 6.8 g of catalyst potassium hydroxide into a 1000 mL round bottom flask, stir mechanically, and heat up to 70° C. until the catalyst dissolves. Then slowly add 466.5g castor oil (CO) (the consumption mol ratio of ester bond in castor oil and diethanolamine is 1:1), add in 0.5h, then keep the temperature unchanged, react 2 hours, every 0.5 The acid value of the reactant was measured after 1 hour, and the reaction end point was reached when the acid value was less than 5 mg KOH / g. Then 300 g of ethyl acetate was added to the round-bottomed flask, the solution was then transferred to a separatory funnel, washed 3 times with saturated brine, and the organic phase was rotary evaporated at 45°C to remove the solvent to obtain light yellow and transparent aminolyzed castor oil (CODEA ). The reaction scheme of this step is as fol...

Embodiment 2

[0051] The preparation process of the castor oil-based polyol of the present embodiment is as follows:

[0052] (1) Put 152.5 g of diethanolamine and 6.8 g of catalyst potassium hydroxide into a 1000 mL round-bottomed flask, stir mechanically, and heat up to 70° C. until the catalyst is dissolved. Then slowly add 466.5g castor oil and finish adding in 0.5h, then keep the temperature unchanged, react for 2 hours, measure the acid value of the reactant every 0.5 hours, and reach the reaction end point when the acid value is less than 5mg KOH / g. Then, 300 g of ethyl acetate was added to the round-bottomed flask, and the solution was transferred to a separatory funnel, washed three times with saturated brine, and the organic phase was rotary evaporated at 45°C to remove the solvent to obtain light yellow and transparent aminolyzed castor oil.

[0053] (2) in another 1000mL round bottom flask, add 200g aminolysis castor oil, 144g methyltetrahydrophthalic anhydride, 1g catalyst trip...

Embodiment 3

[0056] The preparation process of the castor oil-based polyol of the present embodiment is as follows:

[0057] (1) Put 152.5 g of diethanolamine and 6.8 g of catalyst potassium hydroxide into a 1000 mL round-bottomed flask, stir mechanically, and heat up to 70° C. until the catalyst is dissolved. Then slowly add 466.5g castor oil and finish adding in 0.5h, then keep the temperature unchanged, react for 2 hours, measure the acid value of the reactant every 0.5 hours, and reach the reaction end point when the acid value is less than 5mg KOH / g. Then, 300 g of ethyl acetate was added to the round-bottomed flask, and the solution was transferred to a separatory funnel, washed three times with saturated brine, and the organic phase was rotary evaporated at 45° C. to remove the solvent to obtain light yellow and transparent aminolyzed castor oil.

[0058] (2) in another 1000mL round bottom flask, add 200g aminolysis castor oil, 144g methyltetrahydrophthalic anhydride, 1g catalyst tr...

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Abstract

The invention belongs to the technical field of high polymer materials, and particularly relates to vegetable oil-based polyol and a preparation method thereof, and thermocuring vegetable oil-based polyurethane and a preparation method and application thereof. The preparation method comprises the following steps: preparing aminolysis vegetable oil by using an aminolysis agent, carrying out esterification modification on the aminolysis vegetable oil by using acid anhydride, and finally adding epoxidized vegetable oil for blending to obtain the vegetable oil-based polyol with high functionality and high bio-based content. And blending the prepared vegetable oil-based polyol with isocyanate to prepare the thermocuring vegetable oil-based polyurethane. A large number of hydroxyl groups, cyclic structures and epoxidized vegetable oil are introduced into the vegetable oil, the tensile strength and toughness of polyurethane can be effectively improved, and the obtained polyurethane is good in storage stability and high in crosslinking density.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a vegetable oil-based polyol and a preparation method thereof, a heat-cured vegetable oil-based polyurethane and a preparation method and application thereof. Background technique [0002] Vegetable oils are triglycerides with long carbon chains containing double bonds, which are widely distributed in nature and have a wide variety of common ones including tung oil, soybean oil, linseed oil, corn oil, rapeseed oil, peanut oil, olive oil, palm oil , castor oil, etc. Due to its special structure and degradability, the polymers obtained from vegetable oils are not only low-cost, but also environmentally friendly, and are widely used in polyurethane, biodiesel, coatings, biomedical and other fields. [0003] Bio-based polyols can replace part of petroleum-based polyols for the preparation of polyurethane. The natural vegetable oil-based polyurethane products th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/36C09D175/14C09J175/14C09D11/00
CPCC08G18/36C09D175/14C09J175/14C09D11/00Y02P20/584
Inventor 杨卓鸿曾艳茹申芳宁胡筱诚
Owner SOUTH CHINA AGRI UNIV
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