Active methylene type formaldehyde removing agent and application thereof
A kind of active methylene type and methylene type technology, which is applied in the reaction preparation of ester group and hydroxyl group, organic chemistry, separation of dispersed particles, etc., can solve problems such as complicated operation, achieve simple operation, good technical effect, formaldehyde content low effect
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Embodiment 1
[0033] a. Add 1 mol of diethyl malonate and 2 mol of ethylene glycol in the reaction vessel to obtain material I;
[0034] b. Material Ⅰ was reacted under the condition of nitrogen protection and stirring, the reaction temperature was 135°C, and the reaction time was 4 hours. During the reaction, the by-product was separated by atmospheric distillation to obtain material Ⅱ;
[0035] c. Carrying out vacuum distillation on material II to remove reaction by-products and excess diethyl malonate to obtain material III, the pressure of the vacuum distillation is -0.089Mpa, and the temperature is 135°C;
[0036] d. Cool the material Ⅲ to room temperature to obtain a viscous light yellow liquid, which is the active methylene type aldehyde scavenger S to be prepared 1 .
[0037] The obtained active methylene type aldehyde scavenger S 1 Added to the formula of polyurethane foam according to the addition amount in Table 1, the performance index data of the obtained polyurethane foam ar...
Embodiment 2～5
[0039] Embodiments 2 to 5 were carried out according to the steps in Embodiment 1. The only difference was that the reaction raw materials, raw material proportions, reaction time, and reaction temperature were different. See Table 2 for details; the prepared active methylene type aldehyde scavenger According to the addition amount in Table 1, it is added to the foaming formula of the polyurethane foam for foaming, and the performance index data of the prepared polyurethane foam are shown in Table 3.
[0040] The number of moles of raw materials and reaction conditions used in the preparation of table 2 embodiment 1-5 aldehyde removal agent
[0041]
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