Method for micro-wave preparation of konjac glucomannan grafted polyesters

Abstract

The invention relates to a preparation method of a biodegradation material, in particular to the microwave preparation method for konjak glucomannan graft polyester, which is characterized in the following steps: 1) to choose konjak glucomannan, polymerization monomer and catalyst into the reactor at the mass ratio 2:1-1:300 between konjak glucomannan and polymerization monomer, and the mass of catalyst is 0.01%-2% of the polymerization monomer; 2) to mix and evacuate the reactor and put the reactor with vacuum environment into a microwave oven with power of 100-600w and time 2-20 minutes; 3)to take the reactor from the microwave oven, cool the reactor with water to under 50 DEG C and stop the reaction so to get the composite material; to dissolve the composite material with solvent and get solution of composite material with weight concentration of 20-60%; 4) to add the solution of the composite material into the precipitant to sediment and pumping filter at the volume ratio of 1:48between the solvent and the precipitant, and then dry the sedimentation to get the konjak glucomannan graft polyester. The preparation method of a biodegradation material has the advantages of low cost, easy degradation, environmental protection and simple technique.

Description

technical field [0001] The invention relates to a preparation method of konjac glucomannan grafted polyester, which belongs to the field of natural polymer materials and also belongs to the field of ecological environment materials. Background technique [0002] Konjac, also known as konjac, konjac, and hemp taro, is a perennial herb of the family Araceae. There are 130 species known in the world, among which my country is one of the most important producers of konjac in the world. The tubers of some species of Konjac are rich in konjac polysaccharides, especially the content of white konjac and flower konjac varieties is as high as 50-65%. Konjac polysaccharide, also known as konjac glucomannan, is a linear polymer compound connected by numerous mannose and glucose with β-1,4-glycosidic bonds. The molecular ratio of glucose and mannose is 1:1.5-1.7, The molecular weight can be as high as 106 Daltons, the viscosity is extremely high, it is soluble in water, and its swellin...

AI Technical Summary

Problems solved by technology

In addition, low elasticity and high retractility are also the weaknesses of starch

Some hydrophobic aliphatic polyesters (such as polycaprolactone, polylactic acid, etc.) have good water resistance, mechanical properties and processing stability, can be degraded by hydrolysis, and are biodegradable in soil, but the production cost is far Higher than traditional plastics (such as polyethylene, polystyrene, etc.)