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Preparation method of modified corn starch adhesive

A technology of corn starch glue and corn starch, which is applied in the direction of starch-derived adhesives, monocarboxylate copolymer adhesives, adhesive types, etc., can solve the problems of reduced bonding strength, increased system viscosity, and difficulty in coating And other problems, to achieve the effect of speeding up the drying speed, increasing the bonding strength, and the fullness of the film

Active Publication Date: 2014-07-23
GANSU JINDUN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, starch is a chain-like high polymer composed of glucose unit molecules with large molecular weight and complex structure. 2 、C 3 and C 6 Each has a hydroxyl group, so starch contains a large number of hydroxyl groups, which are easy to combine with water molecules, thereby reducing the bonding strength and poor water resistance; moreover, a large number of hydrogen bonds will be formed between these hydroxyl groups, and crystallite bundles will be re-formed, and the viscosity of the system will increase. Fluidity becomes poor, and even produces retrogradation
In this way, the process is more complicated, and the industrial production takes a long time; and the addition of various fillers will make the film harder, difficult to coat, easy to degumming, and will also increase the cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A preparation method of modified corn starch adhesive, the steps are:

[0024] a. Preparation of oxidized starch milk:

[0025] a.1, at room temperature, add 23kg cornstarch to 50kg deionized water and stir to make starch milk for later use;

[0026] a.2. The prepared starch milk is heated to 52°C, and then sodium hydroxide solution is added to adjust the pH to 10;

[0027] a.3, under the condition of 52 ℃, add 5 kg of sodium hypochlorite dropwise to the starch milk with adjusted pH to cause oxidation reaction, add 0.7 kg of sodium metabisulfite after 1 hour to terminate the reaction, cool down to below 40 ℃, adjust with hydrochloric acid The pH is 6.5 to prepare oxidized starch milk, which is for subsequent use;

[0028] b. Preparation of corn starch adhesive

[0029] b.1, at room temperature, add 16kg of polyvinyl alcohol to 260kg of deionized water, and stir to heat up to 90°C to make it completely dissolved to obtain an aqueous solution of polyvinyl alcohol;

[...

Embodiment 2

[0035] A preparation method of modified corn starch adhesive, the steps are:

[0036] a. Preparation of oxidized starch milk:

[0037] a.1, at room temperature, add 26kg cornstarch to 45kg deionized water and stir to make starch milk for later use;

[0038] a.2, the prepared starch milk is heated to 48 ℃ and then add sodium hydroxide solution to adjust the pH to 9;

[0039] a.3, under the condition of 48 ℃, add 2kg sodium hypochlorite dropwise to the starch milk whose pH is adjusted to cause oxidation reaction, add 0.4kg sodium metabisulfite after 1.5 hours to terminate the reaction, cool down to below 40 ℃, adjust pH with hydrochloric acid Prepare oxidized starch milk for 6, for subsequent use;

[0040] b. Preparation of corn starch adhesive

[0041] b.1, at room temperature, add 20kg of polyvinyl alcohol to 240kg of deionized water, and stir to heat up to 80°C to dissolve it completely to obtain an aqueous solution of polyvinyl alcohol;

[0042] b.2. Dissolve 0.2kg persu...

Embodiment 3

[0047] A preparation method of modified corn starch adhesive, the steps are:

[0048] a. Preparation of oxidized starch milk:

[0049] a.1, at room temperature, add 26kg cornstarch to 45kg deionized water and stir to make starch milk for later use;

[0050] a.2, the prepared starch milk is heated to 50 ℃ and then add sodium hydroxide solution to adjust pH to 9;

[0051]a.3, under the condition of 50 ℃, add 3kg sodium hypochlorite dropwise to the starch milk whose pH is adjusted to cause oxidation reaction, add 0.5kg sodium metabisulfite after 1.5 hours to terminate the reaction, cool down to below 40 ℃, adjust pH with hydrochloric acid Prepare oxidized starch milk for 6, for subsequent use;

[0052] b. Preparation of corn starch adhesive

[0053] b.1, at room temperature, add 28kg of polyvinyl alcohol to 240kg of deionized water, and stir to heat up to 80°C to make it completely dissolved to obtain an aqueous solution of polyvinyl alcohol;

[0054] b.2. Dissolve 0.4kg pers...

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Abstract

The invention discloses a preparation method of a modified corn starch adhesive. According to the preparation method, hydroxyl in starch molecules is oxidized into carboxyl under a weakly alkaline condition by adding an oxidant namely sodium hypochlorite to ensure that the adhesive force to paper fiber can be enhanced; and moreover, the retrogradation property of amylose can tend to be lowered, and can be reduced to the lowest extent so as to maintain the viscosity stability. Meanwhile, the crosslinking degree and water resistance of molecular chains can be improved when the adhesive is added into vinyl acetate emulsions. Meanwhile, during the application and drying processes of the adhesive disclosed by the invention, the high-molecular emulsions can be intertwined with the corn starch molecules mutually to form a larger network, thus facilitating the increase of the adhesive strength; and a layer of compact thin film is formed to ensure that an adhesive solution can not be permeated into paper, and meanwhile, hydrophobic groups of the high-molecular emulsions are beneficial for the evaporation of water, thus accelerating the drying speed.

Description

technical field [0001] The invention belongs to the technical field of general-purpose natural adhesives, and in particular relates to a preparation method of a modified corn starch adhesive. Background technique [0002] As a general-purpose natural adhesive, starch adhesive has been paid more and more attention by people. This is mainly based on the following two reasons: first, starch is a kind of natural polymer material with abundant resources, low price and wide application. The characteristics of no peculiar smell and no pollution; secondly, with the dwindling of petroleum resources, it poses a threat to chemical products that use petroleum as raw materials, thus prompting domestic and foreign researchers to look for substitutes, as agricultural products with extremely rich natural resources The by-products naturally piqued interest. However, ordinary corn starch glue often has defects such as low bonding strength, unstable quality, short storage period, easy intermo...

Claims

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Application Information

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IPC IPC(8): C09J131/04C09J103/10C08B31/18C08F118/08
Inventor 白玉宏曹新刚程金奎
Owner GANSU JINDUN CHEM
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