Yellowing resistant the polyurethane foam and preparation method thereof

Abstract

The invention discloses a yellowing resistant the polyurethane foam. The polyurethane foam contains composite polyols, and further comprises, with the weight of the polyols as benchmark, 20-80% of aliphatic isocyanate, 1%-6% of a crosslinking agent, 0.5-2.5% of a catalyst, 0.4-8% of a foaming agent, 0.6-2.4% of a foam stabilizer, and 0.8-5% of essential oil; the composite polyols comprises polyether glycol and vegetable oil polyols accounting for 5-30% of the polyether glycol. The polyurethane foam uses aliphatic isocyanate as an isocyanate monomer, avoids oxidized cracking of aromatic isocyanate and improves the yellowing resistance of the foam; the compound polyether glycol and vegetable oil polyols are used as polyols monomers, the vegetable oil polyols can effectively improve the hydrolysis resistance and thermal stability of the foam; and the essential oil can endow the foam with sterilization and ability to purify air. A preparation method adopts a buffer solution containing acid for impregnation, so that the yellowing resistance of the treated foam is further enhanced.

Description

technical field [0001] The invention relates to the technical field of polyurethane foam, in particular to a yellowing-resistant polyurethane foam and a preparation method thereof. Background technique [0002] Polyurethane foam material is a polymer formed by reacting diisocyanate compound with polyol (polyol), and then foamed and matured to form a foam material. According to the needs of different industries, the addition amount of each reagent and the process parameters can be adjusted to produce various polyurethane foam materials with different characteristics, so that polyurethane foam materials can be widely used in textiles, furniture, In construction, packaging, electronics and other industries, it has become a very important livelihood and industrial material. [0003] Polyurethane foam materials in the prior art generally use aromatic diisocyanates as diisocyanate compounds, and react them with polyols to prepare polyurethane foam materials in one step. Common...

AI Technical Summary

Problems solved by technology

Commonly used aromatic diisocyanates, such as toluene diisocyanate or diphenylmethane diisocyanate, have poor weather resistance and are easy to be oxidatively cracked due to the aromatic functional groups contained therein, making polyurethane foam materials in high humidity and high heat environments Or after being used for a period of time under ultraviolet light, it is easy to generate carcinogens such as toluenediamine or diaminodiphenylmethane. The carcinogens produced contain chromophoric groups with conjugated double bonds, resulting in polyurethane foam materials Yellowing occurs