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Tung-oil-based polyurethane resin and preparation method thereof

A technology of polyurethane resin and tung oil, which is applied in the preparation of carboxylic acid esters, chemical instruments and methods, and the preparation of organic compounds. It can solve the problems of low degree of double bond epoxidation and poor operability, and achieve water resistance. Improvement, strong controllability and high yield

Inactive Publication Date: 2013-04-10
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The defect of this technology is that when tung oil is directly epoxidized, the degree of epoxidation of the double bond is not high due to the effect of steric hindrance, and a large amount of compounds such as hydrogen peroxide, acetic acid and sulfuric acid need to be used in the process, Produces a large amount of wastewater that requires further treatment, so the technology is not very operable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Methylation of tung oil: 1000g of dehydrated tung oil, 200g of anhydrous methanol and 400g of tetrahydrofuran are added to a reactor with a reflux condenser, the temperature is raised to 60°C, and 5g of p-toluenesulfonic acid is added, and the temperature is kept React at 64°C for 2h; then add potassium hydroxide to the reactor to adjust the pH=11, then add 200g of anhydrous methanol, continue to react at the same temperature for 2h for transesterification; then lower the temperature to 40°C, and use an appropriate amount of glacial acetic acid Neutralize to make pH = 7.0, and rinse the reaction product several times with a small amount of deionized water; after liquid separation, remove water and tetrahydrofuran from the organic layer under reduced pressure to obtain a light yellow oily liquid, which is methyl chelate.

[0044] (2) Anhydrided methyl licate: take 500 g of methyl licate and 175 g of maleic anhydride and add them to the reactor together, add 1.75 g of ...

Embodiment 2

[0050] (1) Methylation of tung oil: 1000g of dehydrated tung oil, 150g of anhydrous methanol and 300g of acetone are added to a reactor with a reflux condenser, the temperature is raised to 50°C, and 10g of phosphoric acid is added, and the temperature is maintained at 50°C React for 4 hours; then add sodium hydroxide to the reactor to adjust the pH to 8, then add 300g of anhydrous methanol, continue the reaction at the same temperature for 4 hours for transesterification; then cool down to 20°C, neutralize with an appropriate amount of glacial acetic acid, Make pH = 6.5, and rinse the reaction product with deionized water several times in small amounts; after liquid separation, remove water and acetone from the organic layer under reduced pressure, resulting in light yellow oily methyl chelate.

[0051] (2) Anhydration of methyl chelate: take 500 g of methyl lyceate and 125 g of maleic anhydride and add them to the reactor together, add 0.5 g of anhydrous aluminum trichloride,...

Embodiment 3

[0056] (1) Methylation of tung oil: 1000g of dehydrated tung oil, 400g of anhydrous methanol and 500g of butanone are added to a reactor with a reflux condenser, the temperature is raised to 65°C, and 2g of concentrated sulfuric acid is added, and the temperature is maintained at React at 65°C for 1.5h; then add potassium hydroxide to the reactor to adjust pH=11, then add 100g of anhydrous methanol, continue to react at the same temperature for 1.5h for transesterification; then cool down to 30°C, Neutralize with acetic acid to make pH = 7.0, and rinse the reaction product several times with deionized water in a small amount; after liquid separation, remove water and methyl ethyl ketone from the organic layer under reduced pressure, resulting in light yellow oily methyl chelate.

[0057] (2) Acid anhydride of methyl chelate: take 500 g of the prepared methyl chelate and 200 g of maleic anhydride and add them to the reactor together, add 1.0 g of anhydrous aluminum trichloride, ...

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Abstract

The invention discloses tung-oil-based polyurethane resin and a preparation method thereof. The preparation method comprises the following steps: (1) methyl esterification of tung oil; (2) acid anhydridization of methyl eleostearate; (3) preparation of tung-oil-based polyhydric alcohol, i.e. performing the reaction on tung maleic anhydride and polyhydric alcohol under the action of catalysis of an acid catalyst so as to obtain the tung-oil-based polyhydric alcohol; and (4) preparation of the tung-oil-based polyurethane resin, i.e. performing the reaction on a second type of organic solvent, the tung-oil-based polyhydric alcohol, universal polyhydric alcohol, polyisocyanate and a catalyst to obtain the tung-oil-based polyurethane resin. According to the invention, a route of replacing a petrifaction raw material with a natural renewable raw material has important environmental significance; and moreover, when polyurethane prepared or modified by adopting the tung oil is used as a coating, hardness of a paint film, waterproofness and the like are all improved. According to the invention, in the esterification process, technology is simple and yield is high; subsequent reaction has a simple process; reaction conditions are mild; controllability is strong; and prepared polyurethane can be used for paints, coatings, adhesives and other related fields.

Description

technical field [0001] The invention relates to a tung oil-based polyurethane resin and a preparation method thereof, belonging to the polyurethane preparation technology. Background technique [0002] Polyurethane is a polymer material widely used in coatings, adhesives, inks, printing, textiles, printing and dyeing, etc. Its basic raw materials are polyhydroxy compounds and polyisocyanate compounds. The common polyols include polyether polyols and polyester polyols. Polyethylene oxide, polypropylene oxide, and copolymers of ethylene oxide and propylene oxide with various molecular weights are polyether polyols. End-capped polyesters, such as polyethylene adipate, polytetrahydrofuryl adipate, and polyhexamethylene adipate, are commonly used polyester polyols. Commonly used polyisocyanate compounds include toluene diisocyanate, diphenylmethane diisocyanate, isophorone diisocyanate, polyphenyl polymethylene polyisocyanate and the like. For traditional polyurethane materials...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/75C08G18/73C08G18/48C08G18/36C07C67/08
Inventor 袁才登邵丽英
Owner TIANJIN UNIV
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