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Rigid polyurethane foam prepared by using rape seed oil
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A kind of rigid polyurethane and foam technology, applied in the field of rigid polyurethane foam
Inactive Publication Date: 2006-10-11
HONGBAOLI GRP CO LTD
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Problems solved by technology
[0006] The present invention aims to solve the problem that the existing rigid polyurethane foam relies on petroleum as a raw material. Instead, vegetable oil is used for techn
Method used
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Embodiment 1
[0077] Add 1000g of refined rapeseed oil, 250g of formic acid (80%), and 45g of 50% sulfuric acid into a 2L glass kettle, stir, add 375g of 37% hydrogen peroxide dropwise, and react at 30 to 70°C for 5 to 10 minutes. Hours, stand and separate the acid water by layering, add 6% sodium carbonate solution to neutralize, then wash 3 times with water at a temperature of 70-80°C, reduce pressure, and remove residual water at a vacuum of 100-700kPa. The product epoxy rapeseed oil is obtained, and the epoxy value of the detected product is 5.21%.
Embodiment 2
[0079] Add 980g of refined rapeseed oil, 536g of benzoic acid, and 60g of 50% phosphoric acid into a 2L glass kettle, stir, add dropwise 410g of 38% hydrogen peroxide, and react at 30-70°C for 5-10 hours. Set the layers to separate the acid water, add 5% sodium carbonate solution to neutralize, then wash with water at a temperature of 70-80°C for 3 times, reduce pressure, and remove residual water at a vacuum degree of 100-700kPa. The product epoxy rapeseed oil is obtained, and the epoxy value of the detected product is 5.71%.
Embodiment 3
[0081] Add 1050g of the product epoxy rapeseed oil in Example 1 into a 2L glass kettle, then add 420g of diethylene glycol, 4.9g of potassium hydroxide, stir and heat up, control the reaction temperature at 65-170°C, and the reaction time is 5-10 Hour. Add 211g of glycerol, control the temperature at 120-240°C, carry out the alcoholysis reaction for 4 hours, then keep it for 4 hours under the condition of vacuum degree of 100-750kPa, and then take a sample for analysis, and the crude product with a hydroxyl value of 476mgKOH / g is found. Afterwards, it is refined, and the specific method is as follows: add 16g of 50% phosphoric acid for neutralization for 15 minutes, add 3g of magnesium silicate for adsorption, and then dehydrate for 60 minutes at a vacuum degree of 100-750KPa and a temperature of 80-120°C, and filter , to obtain 1540g of refined bio-based polyol A.
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Abstract
This invention is preparation method of rigid polyurethane foam plastics with rape oil. The procedure is as followings: 1) epoxidise the rape oil and epoxidation agent to produce epoxidised rape oil. 2) React with nucleophilic reagent toget mixed hydroxy fatty acid glycerin; 3) add alcohol or alcohol amine, heat to get mixed hydroxy fatty acid monoesters-biological polyatomic alcohol. 4) Mix with auxiliary catalysis, foam stabilizer and water to form polyether polyol. 5) Mix with foaming agent and isocyanate to obtain rigid polyurethane foam plastics. This invention has a high compatibility with alkane foaming and low cost. It's a good heat insulating material.
Description
technical field [0001] The invention relates to a rigid polyurethane foam prepared from rapeseed oil, which belongs to the field of polyurethane synthetic materials. Background technique [0002] Rigid polyurethane foam is widely used in household refrigerators, freezers, building insulation and pipeline industries due to its excellent thermal insulation performance, good plasticity and processing performance. It is a foam product formed by combining polyether (ester) polyol, foaming agent and isocyanate through chemical reaction under the action of a catalyst. Among them, polyether (ester) polyol is the main raw material for preparing polyurethane foam. [0003] With the rapid development of the global economy, the global demand for all polyols including the above-mentioned polyether (ester) polyols is growing rapidly. However, the existing polyols are all downstream products of petroleum, and due to the shortage of petroleum resources, the prices of these products are re...
Claims
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