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A kind of tung oil-based rigid polyurethane foam and preparation method thereof

A technology of rigid polyurethane and foamed plastics, applied in the field of polyurethane materials, can solve the problems of poor product stability, high reaction temperature, increase of by-products, etc., to avoid cross-linking side reactions, broad application prospects, and good biodegradability.

Active Publication Date: 2020-08-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, the carbon-carbon conjugated triene bond of tung oil has not been effectively transformed and utilized, resulting in poor product stability, and side reactions such as crosslinking and curing are prone to occur during storage.
In addition, the ester bond alcoholysis method also has disadvantages such as low conversion rate and high reaction temperature (220-260°C), which not only wastes energy, but also easily increases by-products when reacting at high temperature for a long time

Method used

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  • A kind of tung oil-based rigid polyurethane foam and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 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 standing until the reaction system was separated, the water phase was removed, the oil phase was washed with 10wt% sodium bicarbonate aqueous solution to neutrality, 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.

[0034] Mix 80 g of the tung oil polyol prepared above and 14 g of diethanolamine evenly, gradually raise the temperature to 90° C. under the protection of nitrogen, and add 0.16 g of catalyst sodium methoxide, raise the temperature to 130° C. under vigorous stirring conditions,...

Embodiment 2

[0037] 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, 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.

[0038] Mix 80 g of the above-prepared tung oil polyol and 16 g of diethanolamine evenly, gradually raise the temperature to 100° C. under the protection of nitrogen, add 0.16 g of catalyst sodium hydroxide, raise the temperature to 150° C. under vigorous stirring, react at con...

Embodiment 3

[0041] Add 500g of tung oil, 60g of formic acid (85wt% solution), 4g of concentrated sulfuric acid, and 120g of n-hexanoic acid into a 2000mL three-neck flask, heat up to 35°C and stir well. Then, 280g 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 45°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.

[0042] Mix 80 g of the tung oil polyol prepared above and 11 g of diethanolamine evenly, gradually raise the temperature to 100° C. under the protection of nitrogen, add 0.12 g of catalyst sodium ethoxide, raise the temperature to 120° C. under vigorous stirring, react at constant...

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Abstract

The present invention relates to a tung oil-based hard polyurethane foam plastic and a preparation method thereof. The preparation method comprises: mixing tung oil, carboxylic acid, an acid catalyst and a hydroxylating reagent according to a certain ratio, and heating to a temperature of 35-45 DEG C; adding a hydrogen peroxide solution in a dropwise manner, maintaining the reaction temperature at 40-65 DEG C, and maintaining the reaction 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; mixing the tung oil polyol and an aminolysis agent, and carrying out an aminolysis reaction under the action of an alkali catalyst to prepare a high hydroxyl value tung oil polyol; and uniformly mixing the high hydroxyl value tung oil polyol, a foam stabilizer, a catalyst and a foaming agent according to a certain ratio to prepare a component A, adding a component B isocyanate, carrying out high-speed stirring mixing, pouring into a mold, and foaming to prepare the tung oil-based hard polyurethane foam plastic. According to the present invention, the prepared tung oil-based hard polyurethane foam plastic has advantages of raw material regeneration, no toxicity, good biodegradability and the like, and belongs to the environment-friendly bio-based polyurethane.

Description

technical field [0001] The invention belongs to the field of polyurethane materials, and in particular relates to a tung oil-based rigid polyurethane foam and a preparation method thereof. Background technique [0002] With the gradual depletion of global petrofossil resources, the development and utilization of biomass resources have attracted much attention. Vegetable oil is a triglyceride of long carbon chain acid containing double bonds. It is widely distributed in nature and has a wide variety. Among them, tung oil, soybean oil, linseed oil, corn oil, rapeseed oil, peanut oil, olive oil, Palm oil, castor oil, etc. Due to the special structure and degradability of vegetable oil, the polymer obtained from it is not only low in cost, but also environmentally friendly, and is widely used in many fields such as polyurethane, biodiesel, coatings, and biomedicine. [0003] Polyurethane materials have been widely used in industry and people's daily life due to their good mech...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/36C08J9/14C07C67/31C07C69/675C08G101/00
CPCC07C67/31C08G18/36C08G2230/00C08J9/141C08J2203/14C08J2375/04C08G2110/0025C07C69/675
Inventor 李澜鹏白富栋李政薛冬乔凯王领民
Owner CHINA PETROLEUM & CHEM CORP
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