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Preparation method of modified starch adhesive

A starch adhesive and modification technology, applied in the direction of starch-derived adhesives, adhesives, adhesive types, etc., can solve the problems of low adhesive performance, complicated process, high cost, etc., and achieve fast drying speed, Simple process and good machine performance

Active Publication Date: 2015-02-18
TANGSHAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process reported so far has defects such as high cost, complicated process or low adhesive performance.

Method used

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  • Preparation method of modified starch adhesive
  • Preparation method of modified starch adhesive

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preparation example Construction

[0011] The preparation method of the modified starch adhesive according to the present invention comprises the steps: (1) adding deionized water to a three-necked flask as a solvent, adding cornstarch to the deionized water, stirring and heating up, so that the cornstarch is fully swollen; (2) ) adding hydrochloric acid and heating up, adding an oxidizing agent, keeping warm to make the oxidizing agent fully react with cornstarch; (3) adding polyvinyl alcohol and heating up; (4) adding boric acid solution, keeping warm after heating up so that boric acid and polyvinyl alcohol fully carry out coupling reaction; (5) Adding formaldehyde solution to keep warm; (6) Adding sodium hydroxide to terminate the reaction; (7) Adding surfactant, drier and preservative, cooling and discharging to obtain modified starch adhesive.

[0012] The difference between the preparation method of modified starch adhesive of the present invention and traditional technology is:

[0013] First, in the tr...

Embodiment 1

[0039] Add 10g of cornstarch into a three-necked flask filled with 100g of deionized water, stir and heat up to 50°C to make the cornstarch fully swell; g oxidant potassium permanganate, keep it warm for 1h to fully react potassium permanganate and cornstarch; add 10g polyvinyl alcohol (alcoholysis degree is 88%), and heat up to 80°C; add 10g pre-prepared concentration of 0.1 % boric acid solution, warm up to 95°C and keep it warm for 0.5h, so that the boric acid and polyvinyl alcohol can fully carry out the coupling reaction; add 10g of formaldehyde solution with a concentration of 10%, and continue to keep warm for 1h; add sodium hydroxide to terminate the reaction, sodium hydroxide The amount is used to control the pH of the solution to be 6-8; finally add tributyl phosphate, calcium chloride, sodium benzoate, and Schiffen compound essence, cool down to 75°C and discharge, and then obtain the modified starch adhesive.

Embodiment 2

[0041] Add 10g of cornstarch into a three-necked flask filled with 150g of deionized water, stir and heat up to 50°C to make the cornstarch fully swell; g oxidant potassium permanganate, keep it warm for 4 hours to fully react potassium permanganate and cornstarch; add 40g polyvinyl alcohol (alcoholysis degree is 88%), and heat up to 80°C; add 10g pre-prepared concentration of 0.1 % boric acid solution, heated up to 90°C and kept warm for 1h, so that the boric acid and polyvinyl alcohol can fully carry out the coupling reaction; add 10g of formaldehyde solution with a concentration of 10%, and keep warm for 1h; add sodium hydroxide to terminate the reaction, The amount is used to control the pH of the solution to be 6-8; finally, tributyl phosphate, calcium chloride, sodium benzoate, and Schiffen compound flavor are added, the temperature is lowered to 75°C and the material is discharged to obtain a modified starch adhesive.

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Abstract

The invention provides a preparation method of a modified starch adhesive, which comprises the following steps: (1) adding deionized water as a solvent into a three-neck flask, adding corn starch into the deionized water, and stirring and heating until the corn starch is sufficiently swollen; (2) adding hydrochloric acid, heating, adding an oxidizer, and keeping the temperature to sufficiently react the oxidizer with the corn starch; (3) adding polyvinyl alcohol, and heating; (4) adding a boric acid solution, heating, and keeping the temperature to sufficiently perform coupling reaction on the boric acid and polyvinyl alcohol; (5) adding a formaldehyde solution, and continuing keeping the temperature; (6) adding sodium hydroxide to terminate the reaction; and (7) adding a surfactant, a drier and a preservative, cooling and discharging to obtain the modified starch adhesive. The preparation method has the advantages of simple technique, accessible raw materials and low cost, and can obtain the modified starch adhesive, which has the advantages of favorable initial viscosity, high drying rate, high viscosity, high mounting performance and stable performance and is convenient for sizing.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to a preparation method of a modified starch adhesive. Background technique [0002] In the process of beer production, the quality of beer bottle labeling glue not only directly affects the production efficiency of beer, but also affects the quality of labeling. Beer bottle labeling glue generally includes the following categories: casein glue, chemical glue, starch glue and its modified glue. Although casein glue has good overall performance, its raw materials are expensive; the toxicity and high pollution of chemical glue have limited its use; and starch glue and its modified glue are cheap, easy to obtain, non-toxic and Non-polluting, it has become the preferred labeling adhesive. [0003] Starch is a polysaccharide polymer composed of many glucose structural units connected to each other. It is usually granular, insoluble in water, can expand or swell in cold water, and sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J103/10C09J129/14C08B31/18
Inventor 于静李敏贤王淑丽王书肖赵安康张悦王璐
Owner TANGSHAN NORMAL UNIV
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