Lignin-based block copolymerization molecular-grade combined polyether, preparation method thereof and application of lignin-based block copolymerization molecular-grade combined polyether in preparation of polyurethane flexible foam material
A technology for block copolymerization and combination of polyethers is applied in the fields of its preparation, lignin-based block copolymerization of molecular-level combined polyethers, the preparation of polyurethane soft foam materials, and the preparation of combined polyethers, which can solve the structure of polyurethane soft-hard copolymerization. Can not fully meet the requirements and other issues
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[0036] The core of the present invention is to provide a method for preparing a lignin-based block copolymerized molecular-level combination polyether, which is called Embodiment 1. The process flow diagram is shown in figure 1 , the method includes the following steps:
[0037] 1) Pretreatment of lignosulfonate:
[0038] Lignosulfonate and pretreatment reagent are mixed at a weight ratio of 1:2-10 at a temperature of 100-140 Pretreatment for 60-240 minutes at a pressure of 10-15MPa;
[0039] 2) Remove the pretreatment reagent:
[0040] The lignosulfonate obtained after the pretreatment is sloughed off the pretreatment reagent through vacuum distillation;
[0041] 3) Soft and hard copolymerization of lignosulfonate and polyether polyol:
[0042] Lignosulfonate and polyether polyol are copolymerized at a weight ratio of 1:1-5, and the copolymerization temperature is 120-180 The time is 1-4 hours, and the lignin-based block copolymerized molecular-level combination polyet...
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