Method for preparing high water absorption konjac glucomannan crylic acid irradiation graft polymers

The invention provides an improved technique for preparation of grafted polymer with high water absorption of Konjac glucomannan and crylic acid by radiation. The technique comprises the steps that: raw materials are prepared by the mass to volume ratio of konjac flour and the crylic acid of one to seven; NaOH is mixed with and neutralizes the crylic acid with the neutralization degree of 55 percent; the added water and the konjac flour are mixed according to the mass ratio of 33:1-44:1 under the condition of heating and stirring with the temperature below 60 DEG C; then the two mixed liquors obtained from the second and the third steps are evenly blended under the condition of the second step; under the protection of nitrogen, the product obtained then is treated with irradiation at room temperature with Co-Gamma irradiation source and the absorbed dose is 4-6 kGy; colloid of the product after irradiation is washed by distilled water and then dried at the temperature of 20-50 DEG C and finally is comminuted