CN113088218A - Preparation method and application of starch adhesive for environment-friendly paper bags - Google Patents
Preparation method and application of starch adhesive for environment-friendly paper bags Download PDFInfo
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- CN113088218A CN113088218A CN202110573768.8A CN202110573768A CN113088218A CN 113088218 A CN113088218 A CN 113088218A CN 202110573768 A CN202110573768 A CN 202110573768A CN 113088218 A CN113088218 A CN 113088218A
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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
Abstract
A preparation method and application of a starch adhesive for environment-friendly paper bags are disclosed, wherein the preparation method comprises the steps of respectively preparing a component A and a component B, reacting corn starch, propylene oxide and sodium trimetaphosphate to prepare the component A, reacting cassava starch and sodium hypochlorite to prepare the component B, and mixing the component A and the component B for reaction to prepare the starch adhesive; the use of a starch adhesive in the preparation of a paper bag, wherein the starch adhesive is prepared by the preparation method. The starch adhesive is prepared by reacting corn starch, propylene oxide and sodium trimetaphosphate to prepare a component A, reacting cassava starch and sodium hypochlorite to prepare a component B, and reacting the component A and the component B to prepare the starch adhesive which is cold water soluble, acid-base neutral, strong in binding power and high in drying speed.
Description
Technical Field
The invention relates to the technical field of starch binders, in particular to a preparation method and application of a starch adhesive for an environment-friendly paper bag.
Background
Due to the production requirements of environmental protection, energy conservation, safety and high speed, the rapid production of the prior paper bag becomes the trend of world development; however, paper bags are usually sealed by using a binder, and the traditional paper bag adhesive is easy to absorb moisture due to high alkalinity, so that the risk of polluting packages is inevitably caused; especially, the traditional paper bag adhesive is generally synthesized by adopting an organic solvent, which inevitably discharges harmful micromolecules and is obviously unhealthy for the bags for food; meanwhile, the existing paper bag adhesive has the defects of low drying speed, poor adhesive force and the like, and most of the existing paper bag adhesive is not suitable for the requirement of high-speed production of modern machinery.
Disclosure of Invention
The invention aims to provide a preparation method of a starch adhesive for an environment-friendly paper bag.
The invention also provides the application of the starch adhesive in preparing paper bags, and the application of the starch adhesive in preparing paper bags.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a starch adhesive for environment-friendly paper bags comprises the following steps:
step (1): preparing a component A and a component B;
the preparation step of the component A comprises the following steps:
step A1: adding metered water into the batching pool, adding sodium sulfate, and stirring; adding a pH regulator A, and stirring until the pH regulator A is fully dissolved;
step B1: adding metered corn starch to prepare corn starch slurry;
step C1: cooling the corn starch slurry to room temperature, keeping the pH value to be more than or equal to 11, and adding propylene oxide for reaction; heating to 40-45 ℃, adding sodium trimetaphosphate, reacting at constant temperature, and neutralizing with a pH regulator A until the pH is 4.0-5.0;
step D1: washing the corn starch slurry with water to reduce the conductivity of the corn starch slurry, removing the rest salt, and dehydrating and drying to obtain a component A;
the preparation step of the component B comprises the following steps:
step A2: adding metered water into the dosing pool, adding the pH regulator B, stirring and fully dissolving;
step B2: adding cassava starch to prepare cassava starch slurry;
step C2: heating the cassava starch slurry to 30-40 ℃, adding sodium hypochlorite for oxidation reaction, simultaneously adding a pH regulator B to control the pH to be more than or equal to 9.0, and keeping the reaction temperature to be 30-40 ℃;
step D2: after the sodium hypochlorite is added, maintaining the pH value to be more than or equal to 9.0, and continuing to perform constant-temperature reaction; adding a pH regulator B to neutralize until the pH value is 3.0-4.0, and stopping the reaction;
step E2: washing the cassava starch slurry with water, reducing the conductivity of the cassava starch slurry, removing the rest salt, and dehydrating and drying to obtain a component B;
step (2): adding metered distilled water into the batching pool, adding metered A component and B component while stirring, and uniformly stirring;
and (3): feeding the compounded mixed slurry into a roller machine, adjusting the amount of starch slurry to be proper, so that the mixed slurry is provided with a semi-gelatinized surface, and carrying out pre-gelatinization reaction;
and (4) crushing and sieving the product to obtain the starch adhesive.
Preferably, in the component A, the ratio of the corn starch to the propylene oxide is 100: (1-10); according to the mass parts, the proportion of the corn starch to the sodium trimetaphosphate is 1000: (0.1 to 1);
in the component B, the weight portion of the cassava starch and the sodium hypochlorite is 100: (10-20).
Preferably, in the component A, the proportion of the corn starch to the sodium sulfate is 100: (1-10).
More preferably, the pH adjuster a and the pH adjuster B each include: sodium hydroxide.
Preferably, the step D1: washing the corn starch slurry with water to reduce the conductivity of the corn starch slurry to be less than or equal to 500 us/cm.
Preferably, said step E2: washing the cassava starch slurry with water, and reducing the conductivity of the cassava starch slurry to be less than or equal to 500 us/cm.
Preferably, in the step (3), the steam pressure in the roller is controlled to be 0.40-0.50 mPa.
Preferably, in the step B1, after adding metered corn starch to prepare corn starch slurry, measuring the concentration and keeping the concentration at 21.5-22.5 degrees Be;
and in the step B2, adding cassava starch to prepare cassava starch slurry, measuring the concentration, and keeping the concentration at 21.5-23 DEG Be.
Preferably, the starch adhesive comprises the following components in percentage by mass: 20-30% of component A and 70-80% of component B.
The starch adhesive is prepared by the preparation method of the starch adhesive for the environment-friendly paper bag.
The invention has the beneficial effects that:
the starch adhesive is prepared by reacting corn starch, propylene oxide and sodium trimetaphosphate to prepare a component A, reacting cassava starch and sodium hypochlorite to prepare a component B, and reacting the component A and the component B to prepare the starch adhesive which is cold water soluble, acid-base neutral, strong in binding power and high in drying speed.
Detailed Description
The technical solution of the present solution is further explained by the following specific embodiments.
A preparation method of a starch adhesive for environment-friendly paper bags comprises the following steps:
step (1): preparing a component A and a component B;
the preparation step of the component A comprises the following steps:
step A1: adding metered water into the batching pool, adding sodium sulfate, and stirring; adding a pH regulator A, and stirring until the pH regulator A is fully dissolved;
step B1: adding metered corn starch to prepare corn starch slurry;
when the concentration is less than 21.5 DEG Be, more modifier is needed to cause waste, and when the concentration is more than 22.5 DEG Be, the stirring is not good, so that the uniformity of the chemical reaction is influenced;
step C1: cooling the corn starch slurry to room temperature, keeping the pH value to be more than or equal to 11, and adding propylene oxide for reaction; heating to 40-45 ℃, adding sodium trimetaphosphate, reacting at constant temperature, and neutralizing with a pH regulator A until the pH is 4.0-5.0;
step D1: washing the corn starch slurry with water to reduce the conductivity of the corn starch slurry, removing the rest salt, and dehydrating and drying to obtain a component A;
the preparation step of the component B comprises the following steps:
step A2: adding metered water into the dosing pool, adding the pH regulator B, stirring and fully dissolving;
step B2: adding cassava starch to prepare cassava starch slurry;
the prepared cassava starch slurry can preferably limit the concentration to 21.5-23 DEG Be; when the concentration is less than 21.5 DEG Be, more modifier is needed to cause waste, and when the concentration is more than 23 DEG Be, stirring is not good to influence the uniformity of chemical reaction;
step C2: heating the cassava starch slurry to 30-40 ℃, adding sodium hypochlorite for oxidation reaction, simultaneously adding a pH regulator B to control the pH to be more than or equal to 9.0, and keeping the reaction temperature to be 30-40 ℃;
step D2: after the sodium hypochlorite is added, maintaining the pH value to be more than or equal to 9.0, and continuing to perform constant-temperature reaction; adding a pH regulator B to neutralize until the pH value is 3.0-4.0, and stopping the reaction;
step E2: washing the cassava starch slurry with water, reducing the conductivity of the cassava starch slurry, removing the rest salt, and dehydrating and drying to obtain a component B;
step (2): adding metered distilled water into the batching pool, adding metered A component and B component while stirring, and uniformly stirring;
optionally, after uniformly stirring, measuring the concentration, and adjusting the concentration to 20.5-21.5 DEG Be to assist the reaction of the component A and the component B to Be more uniform;
and (3): adjusting the pressure to be 0.40-0.50 mPa, feeding the compounded mixed slurry into a roller machine, adjusting the amount of starch slurry to be moderate, enabling the mixed slurry to be provided with a semi-gelatinized surface, and performing pre-gelatinization reaction;
the mixed slurry is put into a roller machine for pre-gelatinization reaction, namely raw starch is cooked, the starch slurry is changed into paste from slurry state when being heated on the roller machine, and the size of a gelatinized surface is determined by adding the slurry amount; the larger the amount of the added slurry is, the larger the gelatinized surface is, and the gelatinized surface is large; similarly, the smaller the amount of the added slurry is, the smaller the gelatinized surface is, and the gelatinized surface is small; therefore, here, the starch slurry amount is moderate, and it is not completely gelatinized, and it is a medium gelatinized noodle.
And (4) crushing and sieving the product to obtain the starch adhesive.
The starch adhesive is prepared by reacting corn starch, propylene oxide and sodium trimetaphosphate to prepare a component A, reacting cassava starch and sodium hypochlorite to prepare a component B, and reacting the component A and the component B to prepare the starch adhesive which is cold water soluble, acid-base neutral, strong in binding power and high in drying speed.
Preferably, in the component A, the ratio of the corn starch to the propylene oxide is 100: (1-10); according to the mass parts, the proportion of the corn starch to the sodium trimetaphosphate is 1000: (0.1 to 1);
in the component B, the weight portion of the cassava starch and the sodium hypochlorite is 100: (10-20).
Preferably, in the component A, the proportion of the corn starch to the sodium sulfate is 100: (1-10).
Generally, starch is overcooked and becomes pasty, raw starch is granular; the sodium sulfate is added to prevent starch from being excessively aged, so that the corn starch is prevented from being excessively aged in the chemical reaction process, the reaction of the epoxypropane and the sodium trimetaphosphate with the corn starch is more uniform, the chemical reaction is prevented from being concentrated in local positions, and the hydroxypropyl crosslinking reaction of the corn starch is more uniform.
Preferably, the pH adjuster a and the pH adjuster B each include: sodium hydroxide.
The weight portion of the cassava starch and the sodium hydroxide is 100: (0.1 to 1). Dissolving sodium hydroxide in water, mixing with tapioca starch, and making into slurry. According to the scheme, the component A and the component B both use sodium hydroxide, after the component A and the component B are mixed, because the sodium hydroxide is used as a pH regulator for the two components, impurities are controllable, and when the starch adhesive is in an acid-base neutral environment, main metal salt mainly uses Na+And SO42-But does not affect the use of the starch adhesive, and the impurities of the starch adhesive can be limited only by controlling the conductivityThe range makes the reaction more controllable.
Preferably, the step D1: washing the corn starch slurry with water to reduce the conductivity of the corn starch slurry to be less than or equal to 500 us/cm.
Preferably, said step E2: washing the cassava starch slurry with water, and reducing the conductivity of the cassava starch slurry to be less than or equal to 500 us/cm.
Distilled water can be used to wash and mix into a slurry, i.e., hydroxypropyl cross-linked starch and oxidized starch, to remove miscellaneous salts of the slurry, e.g., to re-dissolve metal salts as much as possible in distilled water, and to separate from the starch during subsequent dewatering and drying. The solution can limit the metal salt according to the conductivity as an index, and preferably the conductivity is limited to be less than or equal to 500us/cm, and the purity of the hydroxypropyl crosslinked starch and the oxidized starch is higher at the conductivity. Of course, the conductivity may also be limited to 300us/cm or 700us/cm depending on the conditions or customer requirements.
Preferably, in the step (3), the steam pressure in the roller is controlled to be 0.40-0.50 mPa.
Preferably, in the step B1, after adding metered corn starch to prepare corn starch slurry, measuring the concentration and keeping the concentration at 21.5-22.5 degrees Be;
when the concentration of the corn starch is less than 21.5-degree Be, more modifying agents are needed to cause waste, and when the concentration is more than 22.5-degree Be, the stirring is not good, so that the uniformity of the chemical reaction is influenced;
and in the step B2, adding cassava starch to prepare cassava starch slurry, measuring the concentration, and keeping the concentration at 21.5-23 DEG Be.
When the concentration of the cassava starch is less than 21.5-degree Be, more modifying agents are needed to cause waste, and when the concentration is more than 23-degree Be, stirring is not good, so that the uniformity of chemical reaction is influenced.
Preferably, the starch adhesive comprises the following components in percentage by mass: 20-30% of component A and 70-80% of component B.
The component A and the component B can be matched to different contents as required; and preferably, 20-30% of the component A and 70-80% of the component B are limited, and according to the proportion, the preparation cost is lower, the performance is better, and particularly the viscosity and the drying speed are better.
The starch adhesive is prepared by the preparation method of the starch adhesive for the environment-friendly paper bag.
And (3) performance testing:
first, cold water dissolution
Mixing starch adhesive: water 1: 5 (mass ratio) mixing the starch adhesive with water, stirring for 1h at the rotating speed of 1400 revolutions per minute, taking out 80ml of sample, placing the sample in a 100ml beaker, and cooling to 25 ℃; and measuring the viscosity by using a DV type digital viscosity meter, selecting a No. 3 rotor, and measuring the viscosity of the starch adhesive after the starch adhesive is dissolved at the rotating speed of 12 r/min.
II, pH value
Mixing starch adhesive: water 1: 5 (mass ratio) after the starch adhesive is completely mixed with water, the pH value of the starch adhesive is measured by a pH meter.
Third, adhesive force
Mixing starch adhesive: water 1: 5 (mass ratio) mixing the starch adhesive with water to prepare glue, uniformly coating the glue on the craft paper, and folding and adhering the glue position of the craft paper;
initial adhesion: the coating of the craft paper is fluffy and not easy to tear after 10min of tearing (incomplete drying), which indicates that the initial adhesion of the starch adhesive is strong;
normal adhesion: and tearing after the starch is completely dried, wherein the kraft paper can not be separated into two layers of paper completely, and the normal adhesion of the starch adhesive is strong.
Fourthly, the method comprises the following steps: drying speed
Mixing starch adhesive: water 1: 5 (mass ratio) mixing the starch adhesive with water to prepare glue, coating the glue on a bag making device for making bags, wherein the coating amount is 8 g/bag, drying at room temperature, and recording the drying time.
Example a, comparative example a1, comparative example a2, comparative example A3 optional a component and B component are as follows;
the component A comprises:
the raw materials of the component A comprise 1000kg of corn starch, 60kg of propylene oxide, 0.5kg of sodium trimetaphosphate, 80kg of sodium sulfate, 10kg of sodium hydroxide and a plurality of sulfuric acids; the preparation method of the component A comprises the following steps:
step A1: adding water (starch: water 1:1.15) into a mixing tank, adding sodium sulfate, stirring for 10min, adding sodium hydroxide, stirring for 20min, and dissolving completely;
step B1: adding metered corn starch to prepare corn starch slurry, pumping the corn starch slurry into a reaction tank, measuring the concentration, and keeping the concentration at 21.5-22.5 DEG Be;
step C1: cooling the corn starch slurry to room temperature to 22 ℃, keeping the pH value at 11.3, adding propylene oxide, and reacting for 1.5h while keeping the temperature below 22 ℃; heating to 41 ℃, adding sodium trimetaphosphate, reacting at constant temperature for 20h, and neutralizing by using dilute sulfuric acid as a pH regulator A until the pH value is 4.0;
step D1: washing the corn starch slurry with water, reducing the conductivity of the corn starch slurry to be less than or equal to 500us/cm, washing off redundant salt as far as possible, and dehydrating and drying the corn starch slurry to obtain the component A.
And B component:
the raw materials of the component B comprise 6500kg of cassava starch, 1000kg of sodium hypochlorite, a plurality of sulfuric acids and 20kg of sodium hydroxide; the preparation step of the component B comprises the following steps:
step A2: adding water (starch: water 1:1.15) into the material preparing pool, adding sodium hydroxide, stirring for 20min, and stopping stirring after fully dissolving;
step B2: adding cassava starch to prepare cassava starch slurry, pumping the cassava starch slurry into a reaction tank, measuring the concentration, and keeping the concentration at 21.0-23.0 DEG Be;
step C2: heating the cassava starch slurry to 30 ℃, starting a circulating pump, starting to add sodium hypochlorite for oxidation reaction, simultaneously adding dilute sulfuric acid serving as a pH regulator B to control the pH to be 9.0, and keeping the reaction temperature to be 33 ℃;
step D2: after the sodium hypochlorite is added, maintaining the pH value to be more than or equal to 9.0, continuously reacting for 2 hours at the temperature of 35 ℃, adding dilute sulfuric acid serving as a pH regulator B after the neutralization is qualified to neutralize until the pH value is 3.5, and stopping the reaction;
step E2: washing the cassava starch slurry with water, reducing the conductivity of the cassava starch slurry to be less than or equal to 500us/cm, washing away redundant salt as far as possible, and dehydrating and drying the cassava starch slurry to obtain the component B.
Example A:
the preparation method of the starch adhesive comprises the following steps:
step (1): preparing the component A and the component B; 30% of the A component and 70% of the B component are used;
step (2): adding metered distilled water into the batching pool, adding metered A component and B component while stirring, and uniformly stirring;
and (3): feeding the compounded mixed slurry into a roller machine, adjusting the starch slurry amount to be a medium gelatinized surface, and carrying out pre-gelatinization reaction;
and (4) crushing and sieving the product to obtain the product.
Comparative example a 1:
the preparation method of the starch adhesive comprises the following steps:
step (1): preparing a component A; 100% of the A component is used;
step (2): adding metered distilled water into the batching pool, adding the component A while stirring, and uniformly stirring;
and (3): feeding the compounded mixed slurry into a roller machine, adjusting the starch slurry amount to be a medium gelatinized surface, and carrying out pre-gelatinization reaction;
and (4) crushing and sieving the product to obtain the product.
Comparative example a 2:
the preparation method of the starch adhesive comprises the following steps:
step (1): preparing a component B; 100% of the B component is used;
step (2): adding metered distilled water into the batching pool, adding the component B while stirring, and uniformly stirring;
and (3): feeding the compounded mixed slurry into a roller machine, adjusting the starch slurry amount to be a medium gelatinized surface, and carrying out pre-gelatinization reaction;
and (4) crushing and sieving the product to obtain the product.
Comparative example a 3:
the raw materials of the component C comprise 1000kg of corn starch, 60kg of propylene oxide, 0.5kg of sodium trimetaphosphate, 80kg of sodium sulfate, 10kg of sodium hydroxide, a plurality of sulfuric acids, 6500kg of cassava starch, 1000kg of sodium hypochlorite, a plurality of sulfuric acids and 20kg of sodium hydroxide; the preparation step of the component C comprises the following steps:
step A3: adding water (starch: water 1:1.15) into a mixing tank, adding sodium sulfate, stirring for 10min, adding sodium hydroxide, stirring for 20min, and dissolving completely; adding metered corn starch to prepare corn starch slurry, pumping the corn starch slurry into a reaction tank, measuring the concentration, and keeping the concentration at 21.5-22.5 DEG Be; obtaining corn starch slurry;
step B3: adding water (starch: water 1:1.15) into the material preparing pool, adding sodium hydroxide, stirring for 20min, and stopping stirring after fully dissolving; adding cassava starch to prepare cassava starch slurry, pumping the cassava starch slurry into a reaction tank, measuring the concentration, and keeping the concentration at 21.5-23 DEG Be; obtaining cassava starch slurry;
step C3: mixing the corn starch slurry and the cassava starch slurry at the room temperature of 28 ℃ and the pH value of 10, uniformly stirring, and simultaneously adding propylene oxide, sodium hypochlorite and sodium trimetaphosphate; heating to 42 ℃, reacting at constant temperature for 20h, and neutralizing by using dilute sulfuric acid as a pH regulator A until the pH value is 4.0 to obtain mixed starch slurry;
step D3: and (3) washing the mixed starch slurry, reducing the conductivity of the mixed starch slurry to be less than or equal to 500us/cm, washing off redundant salt as much as possible, and dehydrating and drying the mixed starch slurry to obtain the component C.
The preparation method of the starch adhesive comprises the following steps:
step (1): preparing a component C; 100% of the C component is used;
step (2): adding metered distilled water into the batching pool, adding the component C while stirring, and uniformly stirring;
and (3): feeding the compounded mixed slurry into a roller machine, adjusting the starch slurry amount to be a medium gelatinized surface, and carrying out pre-gelatinization reaction;
and (4) crushing and sieving the product to obtain the product.
Performance testing was performed for example A and comparative examples A1-A3, as shown in Table 1.
TABLE 1 Performance testing of example A and comparative examples A1-A3
Description of the drawings:
1. as can be seen from examples A and comparative example A1, comparative example A1 uses only 100% of component A and does not use component B, i.e., the starch adhesive of comparative example A1 is actually only a blend of corn starch, propylene oxide and sodium trimetaphosphate; although comparative example a1 has a viscosity and pH similar to example a, there is a large difference in adhesion and drying speed; the initial adhesion of the comparative example A1 is similar to that of the example A, and the fold position of the craft paper is not easy to tear, because the corn starch reacts with the propylene oxide and then reacts with the sodium trimetaphosphate to generate the hydroxypropyl crosslinked starch with a certain crosslinking degree; thus, comparative example a1 has some tack; however, the normal adhesion of comparative example a1 was insufficient, and the kraft liner was still separable from the folded position after drying; the embodiment A is based on hydroxypropyl crosslinked starch and reacts with the component B to generate a starch adhesive, and the normal adhesion of the embodiment A is strong, and the folded positions of the dried kraft liner cannot be completely separated, so that the hydroxypropyl crosslinked starch and the component B promote the adhesion of the starch adhesive.
2. As can be seen from examples A and comparative examples A1 and A2, comparative example A2 uses only a single component B, which is oxidized starch produced by reacting tapioca starch with sodium hypochlorite, and has a low cohesive force with respect to the cohesive effect of hydroxypropyl crosslinked starch, so that the initial cohesive force and cohesive force of the oxidized starch are insufficient.
In the embodiment A, oxidized starch reacts with hydroxypropyl crosslinked starch to generate starch adhesive; the conventional normal viscosity of the original single hydroxypropyl crosslinked starch is insufficient, but the normal viscosity of the whole starch adhesive can be improved by adding the oxidized starch; in particular, comparative example A1 using hydroxypropyl crosslinked starch alone and comparative example A2 using oxidized starch alone both had insufficient tack; and the drying speed of comparative example A1 and comparative example A2 was low, with drying times of 36h and 44h, respectively; however, in example A, after the hydroxypropyl crosslinked starch and the oxidized starch are used simultaneously for reaction, the drying speed is increased, and the drying time can be reduced to 30 hours, which shows that the drying time can be effectively reduced after the hydroxypropyl crosslinked starch and the oxidized starch are reacted.
3. As can be seen from the examples a and the comparative example A3, in the comparative example A3, the raw materials of the hydroxypropyl crosslinked starch and the oxidized starch are directly mixed, that is, the corn starch, the propylene oxide, the sodium trimetaphosphate, the tapioca starch, the sodium hypochlorite and the like are directly mixed, because the corn starch, the propylene oxide and the sodium trimetaphosphate do not react to form the hydroxypropyl crosslinked starch, a plurality of reactive groups on the corn starch do not completely react with the propylene oxide and the sodium trimetaphosphate, so that the active sites of the corn starch actually connecting the propylene oxide and the sodium trimetaphosphate are few, and instead, the corn starch directly reacts with the tapioca starch and the sodium hypochlorite, and the content of the hydroxypropyl crosslinked starch is reduced; similarly, the cassava starch also directly reacts with the corn starch, the propylene oxide and the sodium trimetaphosphate, so that the generation of oxidized starch is reduced; the content of the hydroxypropyl crosslinked starch and the oxidized starch in the reaction system of the comparative example A3 is too low, so that the prepared starch adhesive has insufficient performance, high viscosity and lower adhesive force than that of the comparative examples A1 and A2; in the embodiment A, the corn starch, the propylene oxide and the sodium trimetaphosphate are sequentially reacted to generate the hydroxypropyl crosslinked starch with more content; reacting the cassava starch with sodium hypochlorite to generate oxidized starch with excessive content; the hydroxypropyl crosslinked starch reacts with the oxidized starch to generate the starch adhesive with proper viscosity, neutral acid and alkali, strong binding power and high drying speed.
Example B:
the component A comprises:
the raw materials of the component A comprise 1000kg of corn starch, 10kg of propylene oxide, 0.1kg of sodium trimetaphosphate, 1kg of sodium sulfate, 10kg of sodium hydroxide and a plurality of sulfuric acids; the preparation method of the component A comprises the following steps:
step A1: adding water (starch: water: 1:1.5) into a dosing pool, adding sodium sulfate, stirring for 10min, adding sodium hydroxide, stirring for 20min, and dissolving completely;
step B1: adding metered corn starch to prepare corn starch slurry, pumping the corn starch slurry into a reaction tank, measuring the concentration, and keeping the concentration at 21.5-22.5 DEG Be;
step C1: cooling the corn starch slurry to room temperature to 22 ℃, keeping the pH value at 11.5, adding propylene oxide, and keeping the temperature at 22 ℃ for reaction for 1.5 h; heating to 41.0 ℃, adding sodium trimetaphosphate, reacting at constant temperature for 18h, and neutralizing by using dilute sulfuric acid as a pH regulator A until the pH value is 5.0;
step D1: washing the corn starch slurry with water, reducing the conductivity of the corn starch slurry to be less than or equal to 400us/cm, washing off redundant salt as far as possible, and dehydrating and drying the corn starch slurry to obtain the component A.
And B component:
the raw materials of the component B comprise 1000kg of cassava starch, 100kg of sodium hypochlorite, a plurality of sulfuric acids and 10kg of sodium hydroxide; the preparation step of the component B comprises the following steps:
step A2: adding water (starch: water 1:1.5) into the material preparing pool, adding sodium hydroxide, stirring for 20min, and stopping stirring after fully dissolving;
step B2: adding cassava starch to prepare cassava starch slurry, pumping the cassava starch slurry into a reaction tank, measuring the concentration, and keeping the concentration at 21.5-22.5 DEG Be;
step C2: heating the cassava starch slurry to 30 ℃, starting a circulating pump, starting to add sodium hypochlorite for oxidation reaction, simultaneously adding dilute sulfuric acid serving as a pH regulator B, controlling the pH to be more than or equal to 9.0, and keeping the reaction temperature at 35 ℃;
step D2: after the sodium hypochlorite is added, maintaining the pH value to be 10.5, continuously reacting for 3 hours at the temperature of 35 ℃, adding dilute sulfuric acid serving as a pH regulator B to neutralize until the pH value is 3.5 after the neutralization is qualified, and stopping the reaction;
step E2: washing the cassava starch slurry with water, reducing the conductivity of the cassava starch slurry to be less than or equal to 400us/cm, washing away redundant salt as far as possible, and dehydrating and drying the cassava starch slurry to obtain the component B.
The preparation method of the starch adhesive comprises the following steps:
step (1): preparing a component A and a component B; 20% of the A component and 80% of the B component are used;
step (2): adding metered distilled water into the batching pool, adding metered A component and B component while stirring, and uniformly stirring;
and (3): feeding the compounded mixed slurry into a roller machine, adjusting the starch slurry amount to be a medium gelatinized surface, and carrying out pre-gelatinization reaction;
and (4) crushing and sieving the product to obtain the product.
Example C:
the component A comprises:
the raw materials of the component A comprise 1000kg of corn starch, 1kg of propylene oxide, 1kg of sodium trimetaphosphate, 10kg of sodium sulfate, 10kg of sodium hydroxide and a plurality of sulfuric acids; the preparation method of the component A comprises the following steps:
step A1: adding water (starch: water: 1:1.5) into a dosing pool, adding sodium sulfate, stirring for 10min, adding sodium hydroxide, stirring for 20min, and dissolving completely;
step B1: adding metered corn starch to prepare corn starch slurry, pumping the corn starch slurry into a reaction tank, measuring the concentration, and keeping the concentration at 21-23 DEG Be;
step C1: cooling the corn starch slurry to room temperature to 20 ℃, keeping the pH value at 11.5, adding propylene oxide, and keeping the temperature at 20 ℃ for reaction for 2.5 h; heating to 43 ℃, adding sodium trimetaphosphate, reacting at constant temperature for 24h, and neutralizing by using dilute sulfuric acid as a pH regulator A until the pH value is 4.5;
step D1: washing the corn starch slurry with water, reducing the conductivity of the corn starch slurry to be less than or equal to 400us/cm, washing off redundant salt as far as possible, and dehydrating and drying the corn starch slurry to obtain the component A.
And B component:
the raw materials of the component B comprise 1000kg of cassava starch, 200kg of sodium hypochlorite, a plurality of sulfuric acids and 10kg of sodium hydroxide; the preparation step of the component B comprises the following steps:
step A2: adding water (starch: water 1:1.5) into the material preparing pool, adding sodium hydroxide, stirring for 20min, and stopping stirring after fully dissolving;
step B2: adding cassava starch to prepare cassava starch slurry, pumping the cassava starch slurry into a reaction tank, measuring the concentration, and keeping the concentration at 21-23 DEG Be;
step C2: heating the cassava starch slurry to 30 ℃, starting a circulating pump, starting to add sodium hypochlorite for oxidation reaction, simultaneously adding dilute sulfuric acid serving as a pH regulator B, controlling the pH to be more than or equal to 9.0, and keeping the reaction temperature at 35 ℃;
step D2: after the sodium hypochlorite is added, maintaining the pH value to be 10.5, continuously reacting for 3 hours at the temperature of 35 ℃, adding dilute sulfuric acid serving as a pH regulator B to neutralize until the pH value is 3.0 after the neutralization is qualified, and stopping the reaction;
step E2: washing the cassava starch slurry with water, reducing the conductivity of the cassava starch slurry to be less than or equal to 400us/cm, washing away redundant salt as far as possible, and dehydrating and drying the cassava starch slurry to obtain the component B.
The preparation method of the starch adhesive comprises the following steps:
step (1): preparing a component A and a component B; 50% of the A component and 50% of the B component are used;
step (2): adding metered distilled water into the batching pool, adding metered A component and B component while stirring, and uniformly stirring;
and (3): feeding the compounded mixed slurry into a roller machine, adjusting the starch slurry amount to be a medium gelatinized surface, and carrying out pre-gelatinization reaction;
and (4) crushing and sieving the product to obtain the product.
Performance tests were performed on examples B and C, as in table 2;
TABLE 2 Performance testing of examples A-C
The technical principle of the present solution is described above with reference to specific embodiments. These descriptions are only used to explain the principles of the present solution and should not be interpreted in any way as limiting the scope of the present solution. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present solution without any inventive effort, which would fall within the scope of the present solution.
Claims (10)
1. A preparation method of a starch adhesive for environment-friendly paper bags is characterized by comprising the following steps:
step (1): preparing a component A and a component B;
the preparation step of the component A comprises the following steps:
step A1: adding metered water into the batching pool, adding sodium sulfate, and stirring; adding a pH regulator A, and stirring until the pH regulator A is fully dissolved;
step B1: adding metered corn starch to prepare corn starch slurry;
step C1: cooling the corn starch slurry to room temperature, keeping the pH value to be more than or equal to 11, and adding propylene oxide for reaction; heating to 40-45 ℃, adding sodium trimetaphosphate, reacting at constant temperature, and neutralizing with a pH regulator A until the pH is 4.0-5.0;
step D1: washing the corn starch slurry with water to reduce the conductivity of the corn starch slurry, removing the rest salt, and dehydrating and drying to obtain a component A;
the preparation step of the component B comprises the following steps:
step A2: adding metered water into the dosing pool, adding the pH regulator B, stirring and fully dissolving;
step B2: adding cassava starch to prepare cassava starch slurry;
step C2: heating the cassava starch slurry to 30-40 ℃, adding sodium hypochlorite for oxidation reaction, simultaneously adding a pH regulator B to control the pH to be more than or equal to 9.0, and keeping the reaction temperature to be 30-40 ℃;
step D2: after the sodium hypochlorite is added, maintaining the pH value to be more than or equal to 9.0, and continuing to perform constant-temperature reaction; adding a pH regulator B to neutralize until the pH value is 3.0-4.0, and stopping the reaction;
step E2: washing the cassava starch slurry with water, reducing the conductivity of the cassava starch slurry, removing the rest salt, and dehydrating and drying to obtain a component B;
step (2): adding metered distilled water into the batching pool, adding metered A component and B component while stirring, and uniformly stirring;
and (3): feeding the compounded mixed slurry into a roller machine, adjusting the amount of starch slurry to be proper, so that the mixed slurry is provided with a semi-gelatinized surface, and carrying out pre-gelatinization reaction;
and (4) crushing and sieving the product to obtain the starch adhesive.
2. The preparation method of the starch adhesive for the environment-friendly paper bag according to claim 1, wherein in the component A, the ratio of the corn starch to the propylene oxide is 100: (1-10); according to the mass parts, the proportion of the corn starch to the sodium trimetaphosphate is 1000: (0.1 to 1);
in the component B, the weight portion of the cassava starch and the sodium hypochlorite is 100: (10-20).
3. The preparation method of the starch adhesive for the environment-friendly paper bag according to claim 2, wherein in the component A, the ratio of the corn starch to the sodium sulfate is 100: (1-10).
4. The method for preparing starch adhesive for environmental friendly paper bags according to claim 2, wherein the pH regulator A and the pH regulator B each comprise: sodium hydroxide.
5. The method for preparing starch adhesive for environmental paper bags according to claim 1, wherein the step D1: washing the corn starch slurry with water to reduce the conductivity of the corn starch slurry to be less than or equal to 500 us/cm.
6. The method for preparing starch adhesive for environmental paper bags according to claim 1, wherein the step E2: washing the cassava starch slurry with water, and reducing the conductivity of the cassava starch slurry to be less than or equal to 500 us/cm.
7. The method for preparing the starch adhesive for the eco-friendly paper bag according to claim 1, wherein in the step (3), the steam pressure in the drum machine is controlled to be 0.40 to 0.50 mPa.
8. The method for preparing the starch adhesive for the environment-friendly paper bags according to claim 1, wherein in the step B1, after the corn starch is added and metered to prepare the corn starch slurry, the concentration is measured and kept at 21.5-22.5 degrees Be;
and in the step B2, adding cassava starch to prepare cassava starch slurry, measuring the concentration, and keeping the concentration at 21.5-23 DEG Be.
9. The preparation method of the starch adhesive for the environment-friendly paper bag according to any one of claims 1 to 8, wherein the starch adhesive comprises the following components in percentage by mass: 20-30% of component A and 70-80% of component B.
10. The use of a starch adhesive in the preparation of paper bags is characterized in that the starch adhesive is prepared by the preparation method of the starch adhesive for the environment-friendly paper bags according to any one of claims 1 to 9.
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| JP2001247716A (en) * | 2000-03-09 | 2001-09-11 | Nippon Starch Chemical Co Ltd | Starch-containing composition and method of producing the composition |
| CN101962518A (en) * | 2010-02-03 | 2011-02-02 | 内蒙古奈伦农业科技股份有限公司 | Starch bonding agent, and preparation method and use thereof |
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