Milk white oxidized starch adhesive and preparation method thereof

Abstract

The invention discloses a milk white oxidized starch adhesive and a preparation method thereof. The milk white oxidized starch adhesive comprises a potato starch, copper sulfate, a pasting agent, an oxidant, a tackifier, and oxalic acid. The invention also discloses a method for preparing the milk white oxidized starch adhesive, wherein the method comprises the following steps: adding the starch into water, stirring for 10 min to expand the starch, adding the copper sulfate and stirring for 1 min, dropwise adding 10% of NaOH water solution to adjust the pH value of the reaction solution to 9-11, adding 30% of the hydrogen peroxide solution to oxidize for 90 min, adding 10% of the NaOH solution, stirring for 30 min, adding borax and stirring for 10 min; and adding oxalic acid and stirring till the color of the product is no longer changed. The oxidized starch adhesive prepared by taking the copper sulfate as a catalyst, taking the oxalic acid as a decolorizing agent and taking the potato starch as the main raw material through a room temperature method is milk white, the technical problem of dark color and bad condition of the oxidized starch adhesive prepared through the room temperature method is solved and the application scope of the product is expanded.

Description

Technical field: [0001] The invention relates to the technical field of adhesives, in particular to a milky white oxidized starch adhesive and a preparation method thereof. Background technique: [0002] Starch adhesive is a kind of adhesive commonly used in the packaging industry. It has the advantages of high strength, light weight, no corrosion, no pollution, good moisture resistance, strong adhesion, tough coating film, simple production equipment, convenient production and coating. Small amount of cloth and other characteristics. As a one-step oxidation method to produce starch adhesives, there are two methods: room temperature and heating. The preparation of oxidized starch adhesives at room temperature has the advantages of no heating, good adhesive fluidity, strong cohesive force, long-term storage, simple equipment, and no need for heating. Environmental pollution and low cost advantages. In order to increase the reaction rate and prepare the oxidized starch adhes...

AI Technical Summary

Problems solved by technology

In order to improve the reaction speed and prepare the oxidized starch adhesive at room temperature, it is necessary to add catalyst sulfate, but in this way, the product appears dark, which is not suitable for applications with high requirements such as wallpaper and paint.