CN112708374A - Method for enhancing stability of gelatinization degree of adhesive - Google Patents
Method for enhancing stability of gelatinization degree of adhesive Download PDFInfo
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- CN112708374A CN112708374A CN202110049923.6A CN202110049923A CN112708374A CN 112708374 A CN112708374 A CN 112708374A CN 202110049923 A CN202110049923 A CN 202110049923A CN 112708374 A CN112708374 A CN 112708374A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J103/00—Adhesives based on starch, amylose or amylopectin or on their derivatives or degradation products
- C09J103/04—Starch derivatives
- C09J103/10—Oxidised starch
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B31/00—Preparation of derivatives of starch
- C08B31/18—Oxidised starch
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Abstract
The invention relates to the technical field of adhesives, in particular to a method for enhancing the gelatinization degree stability of an adhesive, which comprises the following steps: s1, preparing raw materials: extruding and puffing machine, water, oxidant, starch, caustic soda and borax solution; s2, controlling the dosage of the oxidant to be 0.4-0.5kg per 25kg of starch when the temperature of the bottom water is 20 ℃, and adding hot water into the bottom water to increase the water temperature when the water temperature is lower than 20 ℃ so as to shorten the preparation time and also increase the dosage of the oxidant to 0.5 kg; s3, when the temperature is low, the time for adding caustic soda is prolonged to control and reduce the viscosity, and then the next operation of adding borax solution is carried out; s4, gelatinizing, oxidizing the adhesive under alkaline condition to make hydroxymethyl in starch molecule be converted into carboxyl with strong polarity so as to improve fluidity and adhesive force of starch paste, and having high gelatinizing stability.
Description
Technical Field
The invention relates to the technical field of adhesives, in particular to a method for enhancing the stability of gelatinization degree of an adhesive.
Background
At present, the preparation process and the formula of the starch adhesive are hundreds of types, and the formulas are different. The most critical process is also the degree of oxidation. The method has the advantages of excessive oxidation, low viscosity of the adhesive, poor adhesive strength, easy poor adhesion of the paperboard, insufficient oxidation, too high viscosity of the adhesive, incapability of being used on a machine, slow drying of the paperboard, short storage time, easy skinning and gelation, and thus provides a method for enhancing the stability of the gelatinization degree of the adhesive.
Disclosure of Invention
The present invention is directed to a method for enhancing the stability of the gelatinization degree of an adhesive, which solves the problems mentioned in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
a method of enhancing the stability of the degree of gelatinization of an adhesive comprising the steps of:
s1, preparing raw materials: extruding and puffing machine, water, oxidant, starch, caustic soda, additive and borax solution;
s2, controlling the dosage of the oxidant to be 0.4-0.5kg per 25kg of starch when the temperature of the bottom water is 20 ℃, and adding hot water into the bottom water to increase the water temperature when the water temperature is lower than 20 ℃ so as to shorten the preparation time and also increase the dosage of the oxidant to 0.5 kg;
s3, when the temperature is low, the time for adding caustic soda is prolonged to control and reduce the viscosity, and then the next operation of adding borax solution is carried out;
and S4, adding an additive to gelatinize.
Preferably, the oxidizing agent S1 is potassium permanganate, and the additive is one or more of sodium bicarbonate or sodium hydroxide and glyceryl monostearate.
Preferably, the S1 starch is selected from one of corn starch and tapioca starch.
Preferably, the ratio of S3 starch to water does not generally exceed 1: 6.8.
preferably, the S3 caustic soda is added for 2-3 times, the caustic soda is added from the first time to the last time, the caustic soda is added for one hour at about 20 ℃, for example, the time of the caustic soda is adjusted according to the temperature when the temperature is higher or lower than 20 ℃, the caustic soda can be added at one time when the temperature is higher than 30 ℃, the dosage of the caustic soda is generally 2-2.5kg per 25kg of starch, (namely solid caustic soda, 95% flake caustic soda is optimal, the flake caustic soda is allowed to stand for tens of minutes, the viscosity of the flake caustic soda is slowly reduced to be qualified along with the prolonging of the oxidation time, (generally the initial viscosity is about 70-90 seconds), and then the next operation of adding the borax solution is carried out.
Preferably, the S4 is that wet starch with the water content of 15-20 percent which is adjusted in advance is added into an extrusion expander, the starch is gelatinized by generating heat through the friction extrusion of a screw shaft, and then extruded at high pressure through a small hole with the hole diameter of 1-10 mm, the material entering the atmosphere is instantly expanded and dried, and the pregelatinized starch is obtained through crushing and screening, water is not needed basically in the manufacturing process, the temperature of 120-160 ℃ can be maintained by internal friction heat, and a heat source is not needed for drying.
Compared with the prior art, the invention has the beneficial effects that:
in the invention, oxygen bridges in starch molecules can be broken through an oxidant, if one oxygen bridge is oxidized and broken, the starch molecules are depolymerized into two smaller molecules from one molecule, the viscosity of the gelatinized starch is reduced after the starch molecules become small, the hydroxymethyl in the glucose basic unit in the starch molecules can be oxidized into aldehyde groups or carboxyl groups by the oxidant, carboxyl groups are mainly generated when the starch molecules are oxidized under alkaline conditions, aldehyde groups are mainly generated when the starch molecules are oxidized under acidic conditions, the aldehyde groups and the carboxyl groups in the molecules of the starch subjected to oxidation treatment are increased, the apparent water property of the starch molecules is increased, the dissolving capacity of the starch in water is improved, the prepared paste liquid has good fluidity, the adhesive force of paper and fiber is enhanced, the initial adhesive force is enhanced, the adhesive is oxidized under alkaline conditions, and the hydroxymethyl in the starch molecules is oxidized into the carboxyl groups with strong polarity so as to improve the fluidity and the adhesive force of the starch paste liquid, if the oxidation is carried out under the acidic condition, hydroxymethyl in starch molecules is mainly oxidized into aldehyde groups, the aldehyde groups are easy to form hydrogen bonds among molecules, so that the intermolecular force in the adhesive is enhanced, the gelatinization stability is high, the polymerization degree of the starch can be reduced by sodium bicarbonate and sodium hydroxide, the starch is easy to gelatinize, the glycerin monostearate and the like can be embedded with a helical structure of amylose to inhibit the starch from aging, and the starch gelatinization is also facilitated.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
The invention provides a technical scheme that:
a method of enhancing the stability of the degree of gelatinization of an adhesive comprising the steps of:
s1, preparing raw materials: extruding and puffing machine, water, oxidant, starch, caustic soda, additive and borax solution;
s2, controlling the dosage of the oxidant to be 0.4-0.5kg per 25kg of starch when the temperature of the bottom water is 20 ℃, and adding hot water into the bottom water to increase the water temperature when the water temperature is lower than 20 ℃ so as to shorten the preparation time and also increase the dosage of the oxidant to 0.5 kg;
s3, when the temperature is low, the time for adding caustic soda is prolonged to control and reduce the viscosity, and then the next operation of adding borax solution is carried out;
and S4, adding an additive to gelatinize.
The S1 oxidant is potassium permanganate, and the additive is one or more of sodium bicarbonate or sodium hydroxide and glyceryl monostearate.
The S1 starch is selected from one of corn starch and cassava starch.
The S3 starch to water ratio generally does not exceed 1: 6.8.
the S3 caustic soda is preferably added for 2-3 times, the caustic soda is preferably added for one hour from the first time to the last time when the temperature is about 20 ℃, if the temperature is higher or lower than 20 ℃, the time is adjusted according to the temperature, the caustic soda can be added at one time when the temperature is above 30 ℃, the dosage of the caustic soda is generally 2-2.5kg per 25kg of starch, (namely solid caustic soda, 95% flake caustic soda is optimal, the flake caustic soda is allowed to stand for tens of minutes, the viscosity of the flake caustic soda is slowly reduced to be qualified along with the extension of the oxidation time, (the initial viscosity is generally about 70-90 seconds), and then the next operation of adding the borax solution is carried out.
S4, adding wet starch with water content of 15-20% into an extrusion-expansion machine, gelatinizing the starch by generating heat through friction extrusion of a screw shaft, extruding the starch through a small hole with the aperture of 1-10 mm at high pressure, instantly expanding and drying the material once entering the atmosphere, crushing and screening the material to obtain the pregelatinized starch, wherein water is not needed basically in the manufacturing process, the temperature of 120-160 ℃ can be maintained by internal friction heat, and a heat source is not needed for drying.
The oxygen bridges in the starch molecules can be broken through the oxidant, if one oxygen bridge is oxidized and broken, the starch molecules are depolymerized into two smaller molecules from one molecule, the viscosity of the gelatinized starch is reduced after the starch molecules become small, the hydroxymethyl group on a glucose basic unit in the starch molecules can be oxidized into an aldehyde group or a carboxyl group through the oxidant, when the starch molecules are oxidized under the alkaline condition, the carboxyl group is mainly generated, when the starch molecules are oxidized under the acidic condition, the aldehyde group is mainly generated, the aldehyde group and the carboxyl group in the oxidized starch are increased, the apparent water quality of the starch molecules is increased, the dissolving capacity of the starch in water is improved, the prepared paste liquid has good fluidity, the adhesive force of paper and fiber is enhanced, the initial adhesive force is enhanced, the adhesive is oxidized under the alkaline condition, and the hydroxymethyl group in the starch molecules is oxidized into the carboxyl group with strong polarity so as to improve the fluidity and the adhesive force of the starch paste liquid, if the oxidation is carried out under the acidic condition, hydroxymethyl in starch molecules is mainly oxidized into aldehyde groups, and the aldehyde groups are easy to form hydrogen bonds among molecules, so that the intermolecular force in the adhesive is enhanced, and the gelatinization stability is high.
Example (b): preparing raw materials: extruding and puffing machine, water, oxidant, starch, caustic soda, additive and borax solution; when the temperature of bottom water is 20 ℃, the dosage of potassium permanganate is controlled to be 0.4-0.5kg per 25kg of corn starch, if cassava starch is adopted, the dosage is properly reduced, when the water temperature is lower than 20 ℃, hot water can be added into the bottom water to improve the water temperature so as to shorten the preparation time, the dosage of the potassium permanganate can be increased to 0.5kg, when the air temperature is low, the time for adding caustic soda is prolonged to control and reduce the viscosity, the short alkali adding time or the high alkali adding speed can cause the viscosity of the adhesive to rapidly increase, even the adhesive is changed into a mass to be stirred, once the phenomenon occurs, a method for diluting with water cannot be adopted, (because the ratio of the starch to the water is generally not more than 1: 6.8, otherwise, the adhesive can reduce the bonding capacity), the adhesive is allowed to stand for tens of minutes, and when the viscosity is slowly reduced to be qualified along with the extension of the oxidation time, (the initial viscosity is generally about 70-90 seconds), the next operation of adding borax solution is carried out, the phenomenon that the viscosity of the glue is too high or the glue becomes a cluster and cannot be stirred is caused by too fast alkali adding speed and too short time interval, (2-3 times of alkali adding are generally preferred, the alkali adding is preferably carried out from the first time to the last time, about 20 ℃ for one hour is preferred, if the temperature is higher than or lower than 20 ℃, the time length is adjusted according to the air temperature, and if the air temperature is higher than 30 ℃, the caustic soda can be added at one time), the dosage of the caustic soda is generally 2-2.5kg per 25kg of starch, (solid alkali is preferred, flake caustic soda with 95 percent content is optimal), before the caustic soda is used, the content of the caustic soda is measured by a gaut, if the content is lower than 95 percent, the dosage of the caustic soda is correspondingly increased, the dosage of the caustic soda is not enough, the adhesive is opaque, the flowability is poor, the standing time is reduced, the wet starch with the water content adjusted in advance to be 15-20 percent is added into an extruder, the starch is rubbed and extruded by a screw shaft to generate heat for gelatinization and then extruded at high pressure through a small hole with the aperture of 1-10 mm, the material entering the atmosphere is instantaneously expanded and dried, and the pregelatinized starch is obtained by crushing and screening, water is not basically added in the manufacturing process, the temperature of 120-160 ℃ can be maintained by internal friction heat, a heat source is not needed for drying, an oxygen bridge in the starch molecule can be destroyed by an oxidant, if one oxygen bridge is oxidized and broken, the starch molecule is depolymerized into two smaller molecules from one molecule, the viscosity of the starch after gelatinization is reduced after the starch molecule is reduced, the oxidant can oxidize hydroxymethyl on a glucose basic unit in the starch molecule into aldehyde group or carboxyl group, when the oxidation is carried out under the alkaline condition, the carboxyl group is mainly generated, when the oxidation is carried out under the acidic condition, the aldehyde group is mainly generated, and the starch is subjected to oxidation treatment, the aldehyde group and carboxyl group in the molecule are increased, the visual water property of the starch molecule is increased, the dissolving capacity of the starch in water is improved, the prepared paste liquid has good fluidity, the adhesive force of paper and fiber is enhanced, the initial adhesion force is enhanced, the adhesive is oxidized under the alkaline condition, the hydroxymethyl in the starch molecule is oxidized into the carboxyl group with strong polarity so as to improve the fluidity and the adhesive force of the starch paste liquid, for example, the hydroxymethyl in the starch molecule is mainly oxidized into the aldehyde group under the acidic condition, the aldehyde group is easy to form a hydrogen bond between molecules, the intermolecular force in the adhesive is enhanced, and the gelatinization stability is high.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1. A method of enhancing the stability of the gelatinization degree of an adhesive, comprising the steps of:
s1, preparing raw materials: extruding and puffing machine, water, oxidant, starch, caustic soda, additive and borax solution;
s2, controlling the dosage of the oxidant to be 0.4-0.5kg per 25kg of starch when the temperature of the bottom water is 20 ℃, and adding hot water into the bottom water to increase the water temperature when the water temperature is lower than 20 ℃ so as to shorten the preparation time and also increase the dosage of the oxidant to 0.5 kg;
s3, when the temperature is low, the time for adding caustic soda is prolonged to control and reduce the viscosity, and then the next operation of adding borax solution is carried out;
and S4, adding an additive to gelatinize.
2. The method for enhancing the gelatinization stability of an adhesive according to claim 1, wherein the S1 oxidant is potassium permanganate and the additive is one or more of sodium bicarbonate or sodium hydroxide and glyceryl monostearate.
3. The method of claim 1, wherein the starch of S1 is selected from one of corn starch and tapioca starch.
4. The method of claim 1, wherein the ratio of starch to water of S3 is generally no more than 1: 6.8.
5. the method for enhancing the gelatinization degree of the adhesive according to claim 1, wherein S3 caustic soda is added for 2-3 times, preferably for about 20 ℃ to about the last addition, preferably for one hour, and the time is adjusted according to the temperature when the temperature is higher or lower than 20 ℃, and the temperature is higher or lower than 30 ℃, and the caustic soda is added for one time, and the dosage of the caustic soda is generally 2-2.5kg per 25kg of starch, (i.e. solid caustic soda, the dosage of flake caustic soda with 95% is optimal, and the flake caustic soda is allowed to stand for tens of minutes, so that the flake caustic soda can slowly reduce the viscosity to be qualified along with the prolonging of the oxidation time, (the initial viscosity is generally about 70-90 seconds), and then the next operation of adding the borax solution is carried out.
6. The method as claimed in claim 1, wherein the step S4 comprises adding wet starch with water content of 15-20% into an extrusion-puffing machine, extruding the starch via screw shaft friction extrusion to generate heat for gelatinization, extruding the starch via small hole with diameter of 1-10 mm, swelling and drying instantly when the starch is introduced into the atmosphere, pulverizing, and sieving to obtain pregelatinized starch, wherein water is not added during the preparation process, the temperature of 120-160 deg.C can be maintained by internal friction heat, and heat source is not required for drying.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110049923.6A CN112708374A (en) | 2021-01-14 | 2021-01-14 | Method for enhancing stability of gelatinization degree of adhesive |
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| CN202110049923.6A CN112708374A (en) | 2021-01-14 | 2021-01-14 | Method for enhancing stability of gelatinization degree of adhesive |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0317175A (en) * | 1989-06-14 | 1991-01-25 | Oji Koonsutaac Kk | Adhesive composition for corrugated cardboard |
| CN101323764A (en) * | 2008-07-22 | 2008-12-17 | 李元杰 | High-strength quick-drying energy-saving environment-protective cardboard box glue |
-
2021
- 2021-01-14 CN CN202110049923.6A patent/CN112708374A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0317175A (en) * | 1989-06-14 | 1991-01-25 | Oji Koonsutaac Kk | Adhesive composition for corrugated cardboard |
| CN101323764A (en) * | 2008-07-22 | 2008-12-17 | 李元杰 | High-strength quick-drying energy-saving environment-protective cardboard box glue |
Non-Patent Citations (1)
| Title |
|---|
| 许克勇等: "《薯类制品加工工艺与配方》", 31 January 2001, 科学技术文献出版社 * |
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Application publication date: 20210427 |
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