Preparation method of moistureproof starch glue

A starch glue and a technology for preparation steps are applied in the field of preparation of moisture-proof starch glue, which can solve the problems of decreased cohesion, degumming, and poor moisture-proof performance of oxidized starch, and achieve the effects of improving waterproofness and having broad application prospects.

Inactive Publication Date: 2018-07-31
常州五荣化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem that the present invention mainly solves is that in the present starch glue preparation process, starch molecule C 2 、C 3 、C 6 The hydroxyl groups on the oxidized starch are easily oxidized to form aldehyde groups, carbonyl groups, and carboxyl groups. The initial adhesion of the oxidized starch is stronger than that of pure starch glue, but the moisture resistance of the oxidized starch becomes worse, the starch content decreases, and the cohesive force decreases, resulting in degumming. The defective of phenomenon, a kind of preparation method of moisture-proof starch glue is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0026] Take 300g of soybeans and grind them in a soybean grinder, filter to obtain soybean meal, mix distilled water and soybean meal at a mass ratio of 10:1 to obtain a soybean meal suspension, and adjust the concentration of the soybean meal suspension with a 5% sodium hydroxide solution. The pH is 8.5, stirred at room temperature for 1.5 hours to obtain an alkalized solution; put the alkalized solution in a centrifuge, centrifuge at a speed of 4000r / min for 15min, separate to obtain a supernatant, and adjust the upper layer with hydrochloric acid with a mass fraction of 2%. The pH of the supernatant was 4.5, and the acidified solution was obtained. The acidified solution was placed in a centrifuge and centrifuged at a speed of 4000r / min for 15 minutes to obtain the lower protein precipitate; , and then add half of the above protein precipitation to the three-necked flask, heat up to 70°C, start the stirrer, and keep stirring at a speed of 150r / min for 1.5h to obtain the reac...

example 2

[0028] Take 350g of soybeans and grind them in a soybean grinder, filter to obtain soybean meal, mix distilled water and soybean meal at a mass ratio of 10:1 to obtain a soybean meal suspension, and adjust the concentration of the soybean meal suspension with a 5% sodium hydroxide solution. The pH is 9.0, stirred at room temperature for 1.7 hours to obtain an alkalized solution; put the alkalized solution in a centrifuge, and centrifuge at a speed of 4500r / min for 17min to separate the supernatant, and adjust the upper layer with 2% hydrochloric acid The pH of the supernatant was 5.0, and the acidified solution was obtained. The acidified solution was placed in a centrifuge, centrifuged at 4500r / min for 16 minutes, and the protein precipitate in the lower layer was separated; 850mL of sodium hydroxide solution with a mass fraction of 25% was added to the three-necked flask , then add half of the above protein precipitation to the three-necked flask, heat up to 75°C, start the a...

example 3

[0030] Take 400g of soybeans and grind them in a soybean grinder, filter to obtain soybean meal, mix distilled water and soybean meal at a mass ratio of 10:1 to obtain a soybean meal suspension, and adjust the concentration of the soybean meal suspension with a 5% sodium hydroxide solution. The pH is 9.5, and stirred at room temperature for 2.0 hours to obtain an alkalized solution; put the alkalized solution in a centrifuge, centrifuge at a speed of 5000r / min for 18min, separate to obtain a supernatant, and adjust the upper layer with a mass fraction of 2% hydrochloric acid The pH of the supernatant was 5.5, and the acidified solution was obtained. The acidified solution was placed in a centrifuge and centrifuged at a speed of 5000r / min for 18 minutes to obtain the lower protein precipitate; , and then add half of the above protein precipitation to the three-necked flask, heat up to 80°C, start the stirrer, and keep stirring at a speed of 200r / min for 2.0h to obtain the reacti...

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Abstract

The invention relates to the technical field of adhesive preparation, in particular to a preparation method of moistureproof starch glue. The preparation method comprises the following steps: preparing alkalization liquid from soybeans as a raw material, putting the alkalization liquid in a centrifugal machine for centrifugal separation to obtain a supernatant liquid, acidizing the supernatant liquid with diluted hydrochloric acid to obtain a lower protein precipitation, adding a half of the protein precipitation in a sodium hydroxide solution to obtain a hot alkaline degradable protein fluid,treating the other half of protein precipitation to obtain soybean protein powder subjected to acid heat treatment, mixing the hot alkaline degradable protein fluid with the soybean protein powder subjected to acid heat treatment, and performing mixed heating on the mixture and a starch grafted styrene-acrylic emulsion to obtain the moistureproof starch glue. Styrene-acrylic latex is grafted on starch, so that a water absorption effect of a hydroxide radical on the starch can be shielded, and the moisture resistance of the starch glue is improved; and alkali modification of soy protein underrelatively high sodium hydroxide solution concentration is conducted, and part of soy protein is hydrolysed, so that the surface tension of an adhesive emulsion is reduced, the contact angle is increased, the moisture resistance effect is achieved, and the application prospect is wide.

Description

technical field [0001] The invention relates to the technical field of adhesive preparation, in particular to a preparation method of moisture-proof starch glue. Background technique [0002] Starch is a polyhydroxy natural high-molecular carbohydrate, which has the advantages of being renewable, pollution-free, low-cost, and biodegradable. Starch glue is a natural adhesive made from starch. Starch is a natural polymer produced by green plants through photosynthesis, so starch glue belongs to plant glue. [0003] Starch glue has the characteristics of rich sources, low price, convenient use, and non-toxicity. It is widely used in the manufacture of corrugated cardboard boxes, stamp gluing, wood processing, book binding, etc., and has a good development prospect. However, ordinary starch glue has poor water resistance, poor mechanical properties, poor fluidity, slow drying speed, and poor bonding strength due to the limitations of its structure, which limits its promotion a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J151/02C09J189/00C08F251/00C08F212/08C08F220/18C08H1/00
CPCC08F251/00C08H1/00C08L2205/025C08L2205/03C09J151/02C08L89/00C08F220/1804
Inventor 雷国辉何伟仁张建初
Owner 常州五荣化工有限公司
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