Method for preparing bio-based inorganic compound type water absorbent material

Abstract

The invention provides a method for preparing a bio-based inorganic compound type water absorbent material. The method comprises the following steps of: A) adding an inorganic material in the reactor which contains 30 to 150 milliliters of aqueous solution of silane coupling agent, and stirring the mixture for 5 to 30 minutes to allow the inorganic material to adequately disperse; B) adding a bio-based material into the solution obtained by the step A in an amount of 0.7 to 3 percent based on the mass of distilled water, controlling the temperature to be between 30 and 80 DEG C, introducing nitrogen into the reactor for 15 to 30 minutes, uniformly dispersing the nitrogen, adding an initiator, continuing introducing the nitrogen into the equipment for 20 to 40 minutes, adding acrylic acid solution of a crosslinking agent and the blended solution of a sodium salt of acrylic acid and acrylamide into the solution, introducing nitrogen into the equipment for 10 to 20 minutes, performing a thermostatic reaction of the mixture for 1 to 6 hours, precipitating the product in ethanol, filtering the solution and drying the obtained product at a temperature of 65 DEG C, smashing the obtained product to obtain a target product. The prepared bio-based inorganic compound type water absorbent material has a distilled water absorptivity of more than 1,500 g / g and a saline absorptivity of 160 g / g, so the water absorbent material has good water absorptivity.

Description

Technical field [0001] The invention relates to a preparation method of a water-absorbing material, in particular to a preparation method of a bio-based inorganic composite water-absorbing material with super high water absorption. Background technique [0002] Super absorbent resin is a kind of functional polymer material with strong water-absorbing groups and a certain degree of cross-linking. It can be widely used as water-absorbing agent, water-based thickener, flocculant, etc., in women and children's products, medicine and health , Agriculture, construction and other fields have broad market prospects. In recent years, the demand in the world market, the annual demand for water-absorbing agents alone is 450,000 tons, and the demand will increase year by year. It is estimated that by 2010, the consumption of super absorbent resin in the world will reach 225~270kt / a, and the annual growth rate of world consumption will be 3.79%~5.45%. [0003] Today, when environmental protect...

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Problems solved by technology

There are no relevant patent reports on zinc oxide, titanium oxide, calcium oxide, magnesium oxide, aluminum oxide, silicon oxide or their corresponding chloride and bromide inorganic materials that do not contain active groups. In addition, domestic articles currently report high The scientific research results related to water-absorbing materials generally have the defect of poor salt water absorption capacity, and the reported absorption capacity of 0.9% salt water is almost below 100g / g