Natural adhesives are commonly used in our lives. According to different sources, it can be divided into animal glue, vegetable glue and mineral glue. There are leather glue, bone glue, shellac, casein glue, albumin glue, fish gelatin, etc. in animal glue; starch, dextrin, rosin, gum arabic, natural rubber, etc. in plant glue; mineral wax and asphalt in mineral glue Wait. Due to its abundant sources, low price and low toxicity, it is widely used in furniture, binding, packaging and handicraft processing.

Starch adhesive

After the starch adhesive enters the 21st century, the good environmental properties of the material will become a major feature of the new material. As a non-toxic, low-cost, biodegradable and environmentally friendly natural renewable resource, starch is widely used in various industries. Especially in recent years, the world's adhesive industry production technology is developing towards energy saving, low cost, no harm, high viscosity and no solvent.


As a kind of green environmental protection product, starch adhesive has attracted extensive attention and high attention in the adhesive industry. As far as the application and development of starch adhesives are concerned, the prospect of starch adhesives oxidized with corn starch is promising, and the research application is the most.

Recently, starch has been used as an adhesive mainly in paper and paper products, such as paper and carton sealing, labeling, flat topping, sticky envelopes, multi-layer paper bag bonding, and the like.


Here are some common starch adhesives:

01
Oxidized starch adhesive

A mixture of a modified starch having a low degree of polymerization containing an aldehyde group and a carboxyl group and a gelling agent prepared by heating gelatinization or room temperature gelatinization under the action of an oxidizing agent is a carrier-type starch adhesive. After oxidation, the starch forms an oxidized starch having water solubility, wettability and adhesion. The amount of oxidant is small, the degree of oxidation is not enough, the total amount of new functional groups formed by starch is reduced, the viscosity of the adhesive is increased, the initial tack is decreased, the fluidity is poorly used, and the oxidation is excessive, resulting in the viscosity of the adhesive, the initial tack, and the oxidation reaction time. It has a great influence on the acidity, transparency and hydroxyl content of the adhesive. As the reaction time prolongs, the degree of oxidation increases, and the carboxyl content increases, and the viscosity of the product gradually decreases, but the transparency is getting better and better.

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