Vegetable oil-based soft polyurethane foam plastic and preparation method thereof

Abstract

The present invention relates to a vegetable oil-based soft polyurethane foam plastic and a preparation method thereof. The preparation method comprises: mixing mixed vegetable oil containing tung oil and vegetable oil having a non-conjugated carbon-carbon double bond, carboxylic acid, an inorganic 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 under stirring, maintaining the reaction at a temperature of 40-65 DEG C, and maintaining the reaction for 5-7 h after completing the adding; separating to obtain a water phase after completing the reaction, neutralizing, carrying out water washing, and carrying out pressure reducing distillation to obtain a tung oil polyol and epoxy vegetable oil mixture; adding an alkaline catalyst to prepare a low hydroxyl value vegetable oil polyol; and uniformly mixing the low hydroxyl value vegetable oil polyol, a foam stabilizer, an amine-based catalyst, an organotin-based catalyst, a foaming agent and water to prepare a component A, adding a component B isocyanate, and foaming to prepare the vegetable oil-based soft polyurethane foam plastic. The vegetable oil-based soft polyurethane foam plastic of the present invention has advantages of raw materials regeneration, no toxicity, good biodegradability and the like, and belongs to the environmentally friendly bio-based polyurethane.

Description

technical field [0001] The invention belongs to the field of polyurethane materials, and in particular relates to a vegetable oil-based flexible 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 g...

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 in the process of preparing polyols, the epoxy group has high reactivity, poor selectivity, and side reactions are prone to occur, resulting in the formation of macromolecular cross-linked products, resulting in a sharp increase in viscosity. Usually solid and cannot be used for further synthesis of polyurethane materials

Research literature (e.g. Epoxidation of Natural Triglycerides with Ethylmethyldioxirane, Journal of the American Oil Chemists' Society, 1996, 73:461-464) examines different vegetable oils such as corn oil, soybean oil, sunflower oil, cottonseed oil, tung oil, etc. During the epoxidation process of unsaturated vegetable oil, it was also found that tung oil with only conjugated double bonds undergoes a crosslinking reaction during the epoxidation process, resulting in a sharp increase in viscosity and cannot be used to prepare polyurethane materials

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