Alkoxy castor oil-based polyglycidyl ether and preparation method thereof
A technology of polyglycidyl ether and alkoxy castor, applied in the direction of organic chemistry, can solve the problem of low epoxy value, achieve high epoxy value, improve flexibility, and improve flexibility
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[0036] The present invention also provides the preparation method of the alkoxy castor oil base polyglycidyl ether described in the above technical scheme, comprising the following steps:
[0037] Castor oil, hydrogen peroxide, acetic acid, aromatic hydrocarbon solvent and acidic catalyst are mixed to carry out epoxidation reaction, obtain epoxidized castor oil;
[0038] The epoxidized castor oil, the hydroxyl-containing substance and the catalyst are mixed for the first ring-opening reaction to obtain an alkoxy castor oil-based polyol, and the hydroxyl-containing substance is a fatty alcohol or an alkylphenol;
[0039] The alkoxy castor oil-based polyol and epichlorohydrin are sequentially subjected to a second ring-opening reaction and a ring-closing reaction to obtain the alkoxy castor oil-based polyglycidyl ether.
[0040] The invention mixes castor oil, hydrogen peroxide, acetic acid, aromatic hydrocarbon solvent and an acidic catalyst for epoxidation reaction to obtain e...
example 1
[0063] Add castor oil, hydrogen peroxide, acetic acid, 732 type strongly acidic cation exchange resin and solvent toluene in a four-necked flask equipped with a mechanical stirrer with a mechanical seal, a reflux condenser and a thermometer, the molar ratio of castor oil, hydrogen peroxide to acetic acid 1:3.5:3, the amount of strongly acidic cation exchange resin is 7.5% of the mass of castor oil, and the amount of toluene is 50% of the mass of castor oil. Slowly add 30% hydrogen peroxide dropwise at 60°C under stirring conditions, and finish adding in 2 hours. Insulated and reacted for 5 hours, then filtered, washed with water, and evaporated under reduced pressure to remove low boilers such as toluene to obtain epoxidized castor oil with an epoxy value of 0.20eq / 100g.
example 2
[0065] The epoxidized castor oil, methyl alcohol and BF that example 1 makes 3 -Et 2 O joins in the four-necked flask that the mechanical stirrer with mechanical seal, reflux condenser and thermometer are housed, n (epoxidized castor oil epoxy group): n (methanol)=1:20, BF 3 -Et 2 The amount of O is 0.5% of the mass of epoxidized castor oil, reacted for 2 hours at 55°C, washed with water to remove the catalyst after the reaction, and then distilled off methanol to obtain methoxy castor oil-based polyols. The hydroxyl value was 245.16mgKOH / g.
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