CN112940645A - Preparation method of water-based starch adhesive - Google Patents
Preparation method of water-based starch adhesive Download PDFInfo
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- CN112940645A CN112940645A CN202110164216.1A CN202110164216A CN112940645A CN 112940645 A CN112940645 A CN 112940645A CN 202110164216 A CN202110164216 A CN 202110164216A CN 112940645 A CN112940645 A CN 112940645A
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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
- C09J103/02—Starch; Degradation products thereof, e.g. dextrin
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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
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention relates to a preparation method of a water-based starch adhesive, the water-based starch adhesive obtained by the preparation method and the application thereof in the bonding aspect of corrugated paper; the aqueous starch adhesive prepared by the method of the invention ensures high solid content and low water content, reduces viscosity, only needs less glue application amount when being applied to the mounting compounding of corrugated paper, can reduce energy consumption of drying and drying, can shorten the processing turnover period of semi-finished products, and can greatly reduce production and manufacturing cost; the mounted composite corrugated board product obtained by applying the water-based starch adhesive has higher composite tear strength and good flexibility after being cured into a film; more importantly, the weather resistance is excellent, the paint can be applied in high-temperature and high-humidity environment, and can adapt to storage and transportation in high-temperature and high-humidity environment.
Description
Technical Field
The invention relates to a preparation method of a water-based starch adhesive, the water-based starch adhesive obtained by the preparation method and application thereof in the aspect of corrugated paper adhesion, and belongs to the technical field of adhesives.
Background
With the prosperity of internet e-commerce business, the use amount of paper corrugated paper for express packaging is increased by orders of magnitude. Based on the consideration of production cost, the mounting composite glue of the paper corrugated box mainly comprises a starch adhesive.
As for the water-based starch adhesive, according to the existing glue mixing formula and the synthesis process technology, the technical problem of high viscosity of the starch adhesive is not solved by the technology, and the solid content of the prepared starch adhesive product is lower. The solid content of the currently marketed starch glue finished product is generally lower (20-30%).
In order to ensure the mounting combination fastness of the corrugated surface paper and the corrugated medium paper, the solid content of the existing starch glue is low, and the glue coating amount needs to be increased in practical application (the wet glue coating amount is generally 15 g/m)2Left and right). Because the water content of the existing starch glue is higher, in order to realize the compounding fastness of the laminated corrugated paper, a very long drying device needs to be configured on a laminated composite corrugated manufacturing line, and the drying temperature is increased to evaporate the water in the starch glue. Even so, the water content in the flute that compounds to mounting is still higher, needs to stack the semi-manufactured goods that compounds to mounting in the workshop natural equilibrium volatilize moisture. The production process has large overall energy consumption and long production turnover time.
In addition, the finished starch glue produced by the existing preparation process has poor water resistance, the composite fastness of the prepared and formed corrugated case is greatly reduced under the high-temperature and high-humidity environment, and the composite layer is easy to separate from the layer, so that the corrugated case cannot be applied to the high-temperature and high-humidity environment; for example, corrugated containers for shipping have to use some non-environmentally friendly resin based adhesives.
Therefore, a person skilled in the art hopes to develop a new formula of the water-based starch adhesive and a synthesis process thereof, the prepared adhesive product can realize low viscosity while ensuring high solid content, the low viscosity enables the adhesive product to be coated on corrugated paper, the chemical characteristic of high solid content enables the adhesive product to only need less glue application amount when being applied to the laminating compounding of the corrugated paper, and the chemical characteristic of less water content reduces the oven length of a laminating compounding machine when being applied to the laminating compounding of the corrugated paper, reduces the drying temperature, reduces the process time and reduces the energy consumption of the laminating compounding to the corrugated paper to the greatest extent; more importantly, the prepared adhesive product has better weather resistance after being dried into a film, and the corrugated case manufactured by laminating and compounding can be widely applied to the high-temperature and high-humidity environment.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides, in one aspect, a method for preparing an aqueous starch adhesive, wherein,
the raw material formula comprises the following components in parts by weight based on 100 parts by weight of the water-based starch adhesive:
50-70% of starch
21 to 42 g of water
1.8-3.5% of alpha-amylase
5 to 10 parts of a crosslinking agent
Wherein the cross-linking agent is a carbodiimide cross-linking agent;
the preparation method comprises the following steps:
step 1): weighing the water and the alpha-amylase according to the raw material formula, adding the water and the alpha-amylase into a reaction kettle, and stirring and mixing uniformly;
step 2): weighing the starch according to the raw material formula, slowly adding the starch into the reaction kettle while stirring at the speed of 300-350 r/min, and gradually heating the reaction kettle from room temperature; based on 100 parts by weight of the starch adhesive, the feeding speed of the starch is 1.7-4.5 parts/min, the heating speed of the reaction kettle is 1-2 ℃/min, and all feeding is completed before the temperature of the reaction kettle is raised to 60 ℃; after the feeding is finished, heating the reaction kettle to 80-85 ℃, keeping the constant temperature, maintaining the stirring speed, and reacting for 50-70 minutes;
step 3): weighing the cross-linking agent according to the raw material formula, slowly adding the cross-linking agent into the reaction kettle while stirring at the speed of 300-350 r/min, maintaining the temperature at 80-85 ℃, and reacting for 50-70 minutes;
step 4): cooling the material obtained in the step 3) to 30-40 ℃.
Preferably, the raw material formula further comprises 0.1-0.3 part by weight of a sterilization preservative based on 100 parts by weight of the starch adhesive; in the step 4), after the temperature of the material is reduced to 30-40 ℃, the sterilizing preservative is weighed according to the raw material formula and added into the material, and the mixture is stirred and mixed uniformly.
Preferably, the starch is corn starch or tapioca starch.
Preferably, the viscosity of the starch adhesive is 400-1000 cps, and the solid content is 50-70%.
The invention also provides the application of the starch adhesive in the binding of corrugated paper.
The aqueous starch adhesive prepared by the method of the invention ensures high solid content and low water content, reduces viscosity, only needs less glue application amount when being applied to the mounting compounding of corrugated paper, can reduce energy consumption of drying and drying, can shorten the processing turnover period of semi-finished products, and can greatly reduce production and manufacturing cost; the mounted composite corrugated board product obtained by applying the water-based starch adhesive has higher composite tear strength and good flexibility after being cured into a film; more importantly, the weather resistance is excellent, the paint can be applied in high-temperature and high-humidity environment, and can adapt to storage and transportation in high-temperature and high-humidity environment.
Detailed Description
In one embodiment of the present invention, a method of preparing an aqueous starch adhesive is provided, wherein,
the raw material formula comprises the following components in parts by weight based on 100 parts by weight of the water-based starch adhesive:
wherein the cross-linking agent is a carbodiimide cross-linking agent;
the preparation method comprises the following steps:
step 1): weighing the water and the alpha-amylase according to the raw material formula, adding the water and the alpha-amylase into a reaction kettle, and stirring and mixing uniformly;
step 2): weighing the starch according to the raw material formula, slowly adding the starch into the reaction kettle while stirring at the speed of 300-350 r/min, and gradually heating the reaction kettle from room temperature; based on 100 parts by weight of the starch adhesive, the feeding speed of the starch is 1.7-4.5 parts/min, the heating speed of the reaction kettle is 1-2 ℃/min, and all feeding is completed before the temperature of the reaction kettle is raised to 60 ℃; after the feeding is finished, heating the reaction kettle to 80-85 ℃, keeping the constant temperature, maintaining the stirring speed, and reacting for 50-70 minutes;
step 3): weighing the cross-linking agent according to the raw material formula, slowly adding the cross-linking agent into the reaction kettle while stirring at the speed of 300-350 r/min, maintaining the temperature at 80-85 ℃, and reacting for 50-70 minutes;
step 4): cooling the material obtained in the step 3) to 30-40 ℃.
As explained in the above background art section, there is a technical bottleneck in the prior art regarding the preparation process of aqueous starch adhesives, and it is impossible to achieve both "high solid content/low water content" and "low viscosity". For example, if the solid content of starch glue prepared by the existing process is high, the viscosity is also high, the fluidity is poor, and the gluing requirement of corrugated paper cannot be met; therefore, in practical application, in order to meet the gluing requirement of corrugated paper, the prepared starch glue can only be diluted to reduce the viscosity to a proper range, and meanwhile, the solid content is also reduced, which is why the solid content of the commercial starch glue finished product is generally low.
It is also stated in the above background that the "low solid content/high water content" of commercially available aqueous starch adhesive products leads to increased coating weight, and that drying leads to increased energy consumption and production turnaround times.
The inventor hopes to develop a new formula of the water-based starch adhesive and a synthesis process thereof, the prepared adhesive product can ensure high solid content and realize low viscosity, the low viscosity enables the adhesive product to be coated on corrugated paper, the chemical characteristic of high solid content enables the adhesive product to only need less glue application amount when being applied to the mounting and compounding of the corrugated paper, and the chemical characteristic of less water content reduces the length of an oven of a mounting and compounding machine when being applied to the mounting and compounding of the corrugated paper, reduces the drying temperature, reduces the process time and reduces the energy consumption of the mounting and compounding of the corrugated paper to the greatest extent; more importantly, the prepared adhesive product has better weather resistance after being dried into a film, and the corrugated case manufactured by laminating and compounding can be widely applied to the high-temperature and high-humidity environment.
The inventor makes a great deal of research and experiments on the combination of the formula and the process of the water-based starch adhesive, and finds that the technical bottleneck can be solved by combining a specific formula in a two-step enzymolysis mode. The first step is slowly heating up, gradually feeding, stirring at high speed for enzymolysis, and the second step is high temperature enzymolysis for a period of time. The operating conditions of the first step of slow heating enzymolysis are very harsh, stirring is carried out at the speed of 300-350 r/min, the feeding speed of starch is 1.7-4.5 parts/min (calculated by 100 parts by weight of the starch adhesive), meanwhile, the heating speed of the reaction kettle is 1-2 ℃/min, and all feeding is completed before the temperature of the reaction kettle is raised to 60 ℃; the second step of high temperature enzymolysis has the following operating conditions: and (3) heating the reaction kettle to 80-85 ℃, keeping the constant temperature, and reacting for 50-70 minutes.
In the prior art, the enzymolysis temperature of alpha-amylase is generally low, for example 50 ℃, and the conventional enzymolysis mode is to add starch and amylase at one time, directly heat up to 50 ℃, and maintain the temperature at 50 ℃ for enzymolysis. According to the common knowledge and thinking of the technicians in this field, it is considered that the molecular weight of starch is large, and if the starch is subjected to enzymolysis at high temperature (80 ℃), the viscosity of the starch rises linearly, and the starch becomes pasty and can not flow.
However, the inventor of the present application has bypassed the common sense and thinking trend of the prior art, and wants to try to perform the step-by-step enzymolysis, wherein the enzymolysis is performed at a low temperature and a medium temperature, and then the enzymolysis is performed at a high temperature, but a large number of attempts fail in the initial stage, and the high temperature enzymolysis is easy to gelatinize. Finally, the method is unexpectedly found that under the harsh condition (stirring is carried out at the speed of 300-350 r/min, the feeding speed of the starch is 1.7-4.5 parts/min, the heating speed of the reaction kettle is 1-2 ℃/min, and all feeding is completed before the temperature of the reaction kettle is raised to 60 ℃), the starch is slowly heated and gradually added for preliminary enzymolysis, then the temperature is raised to high temperature for sufficient enzymolysis, the starch with large molecular weight can be sufficiently enzymolyzed into micromolecules, and then the starch adhesive with high solid content/low water content and low viscosity is formed under the action of a specific carbodiimide crosslinking agent.
The present invention will be further described with reference to the following examples, but the present invention is not limited to these specific embodiments.
And (4) supplementary notes: the percentages (%) appearing in the specific embodiments are, unless otherwise indicated, percentages by weight (% wt).
Example 1
The formulation of the aqueous starch adhesive of example 1 is as follows:
the raw material formula comprises the following components in parts by weight based on 100 parts by weight of the aqueous starch adhesive in example 1:
wherein the corn native starch is edible corn starch (first grade) from Shandong Huayi corn science and technology Limited; the alpha-amylase is a product obtained from XK-86 of New Ente materials, Inc., Taizhou; the cross-linking agent is a carbodiimide cross-linking agent and is a DX-W140 product purchased from Shanghai Zhuo New Material science and technology Limited company; the sterilizing preservative is a product which is purchased from U-W66 company of new materials, Inc. in Guangzhou.
The aqueous starch adhesive of example 1 was prepared as follows:
step 1): weighing water (tap water or purified water) and alpha-amylase according to the formula of the raw materials, adding the weighed water and the alpha-amylase into a reaction kettle, and stirring and mixing the materials uniformly;
step 2): weighing the corn native starch according to the raw material formula, slowly adding the starch into a reaction kettle while stirring at the speed of 350r/min, and gradually heating the reaction kettle from room temperature (about 22 ℃); based on 100 parts by weight of the starch adhesive, the feeding speed of the starch is about 3 parts/min, the heating speed of the reaction kettle is 1.5 ℃/min, and all feeding is completed before the temperature of the reaction kettle is raised to 60 ℃; after the feeding is finished, heating the reaction kettle to 80-85 ℃, keeping the temperature constant, maintaining the stirring speed of 350r/min, and reacting for about 60 minutes;
step 3): weighing the cross-linking agent according to the raw material formula, stirring at the speed of 350r/min, slowly adding the cross-linking agent into a reaction kettle, maintaining the temperature at 80-85 ℃, and reacting for about 60 minutes;
step 4): cooling the material obtained in the step 3) to 30-40 ℃, weighing the sterilizing preservative according to the raw material formula, adding the sterilizing preservative into the material, and uniformly stirring and mixing to obtain the aqueous starch adhesive of the embodiment 1.
Example 2
The formulation of the aqueous starch adhesive of example 2 is as follows:
the raw material formula comprises the following components in parts by weight based on 100 parts by weight of the aqueous starch adhesive of example 2:
corn native starch 60
Water 31
Alpha-amylase 3
Cross-linking agent 6
The sources of corn native starch, alpha-amylase and cross-linking agent were the same as in example 1.
The procedure for the preparation of the aqueous starch adhesive of example 2 was as follows:
step 1): weighing water (tap water or purified water) and alpha-amylase according to the formula of the raw materials, adding the weighed water and the alpha-amylase into a reaction kettle, and stirring and mixing the materials uniformly;
step 2): weighing the corn native starch according to the raw material formula, slowly adding the starch into a reaction kettle while stirring at the speed of 350r/min, and gradually heating the reaction kettle from room temperature (about 22 ℃); the feeding speed of the starch is about 4 parts/min, the heating speed of the reaction kettle is 2 ℃/min, and the whole feeding is completed before the temperature of the reaction kettle is raised to 60 ℃ based on 100 parts by weight of the starch adhesive; after the feeding is finished, heating the reaction kettle to 80-85 ℃, keeping the temperature constant, maintaining the stirring speed of 350r/min, and reacting for about 60 minutes;
step 3): weighing the cross-linking agent according to the raw material formula, stirring at the speed of 350r/min, slowly adding the cross-linking agent into a reaction kettle, maintaining the temperature at 80-85 ℃, and reacting for about 60 minutes;
step 4): cooling the material obtained in the step 3) to 30-40 ℃ to obtain the aqueous starch adhesive of the embodiment 2.
Example 3
The formulation of the aqueous starch adhesive of example 3 is as follows:
the raw material formula of the water-based starch adhesive comprises the following components in parts by weight based on 100 parts by weight of the water-based starch adhesive in example 3:
in the middle, the cassava native starch is a product LSP-111 purchased from Thai Hua GmbH; the sources of the other components were the same as in example 1.
The procedure for the preparation of the aqueous starch adhesive of example 3 was as follows:
step 1): weighing water (tap water or purified water) and alpha-amylase according to the formula of the raw materials, adding the weighed water and the alpha-amylase into a reaction kettle, and stirring and mixing the materials uniformly;
step 2): weighing the cassava raw starch according to the raw material formula, slowly adding the starch into a reaction kettle while stirring at the speed of 350r/min, and gradually heating the reaction kettle from room temperature (about 22 ℃); based on 100 parts by weight of the starch adhesive, the feeding speed of the starch is about 2 parts/min, the heating speed of the reaction kettle is 1.1 ℃/min, and all feeding is completed before the temperature of the reaction kettle is raised to 60 ℃; after the feeding is finished, heating the reaction kettle to 80-85 ℃, keeping the temperature constant, maintaining the stirring speed of 350r/min, and reacting for about 60 minutes;
step 3): weighing the cross-linking agent according to the raw material formula, stirring at the speed of 350r/min, slowly adding the cross-linking agent into a reaction kettle, maintaining the temperature at 80-85 ℃, and reacting for about 60 minutes;
step 4): cooling the material obtained in the step 3) to 30-40 ℃, weighing the sterilizing preservative according to the raw material formula, adding the sterilizing preservative into the material, and uniformly stirring and mixing to obtain the aqueous starch adhesive of the embodiment 3.
Application examples 1 to 3
The water-based starch adhesive obtained in the above examples 1-3 was used to manufacture a mounting corrugated board.
The manufacturing method mainly comprises the following steps:
firstly, the aqueous starch adhesives of examples 1-3 are directly coated on 90g/m by a single-head corrugated coating compound machine with an anilox roller of 150-200 lines2Paper on E flute and 70g/m2The white kraft paper is compounded with the mounting, and the dry coating glue applying amount of the water-based starch adhesive is controlled to be 3-4.5 g/m2；
Secondly, drying the mounted and compounded paper corrugated board through a hot-temperature oven at the temperature of 110-; the water-based starch adhesives of examples 1-3 were used to prepare the opposite-mounted composite corrugated boards of application examples 1-3, respectively.
Effect data
Test one
For the aqueous starch adhesives of examples 1-3, the following performance tests were performed in terms of both viscosity and solids content.
Comparative example: commercially available S300 aqueous starch adhesive products from shanghai new energy science ltd.
Viscosity of the adhesive: the samples of examples 1 to 3 and comparative example were each slowly poured into a liquid bath of a rotary viscometer at room temperature and 25 ℃ and the rotary system was operated by opening the instrument switch. After the heat preservation operation, when the reading pointer on the instrument is kept at a fixed position, the viscosity of the adhesive of the tested sample is obtained;
solid content of the adhesive: placing a weighing bottle in a drying box at 105 ℃ for heating, taking out the weighing bottle after half an hour, placing the weighing bottle in a dryer for cooling, weighing the weighing bottle on an electronic balance to obtain a weight W1, enabling the electronic balance to return to zero, respectively weighing a sample weight W2 (1-2G of the sample is generally weighed), placing the weighing bottle in the drying box at 105 ℃ for drying until the weighing bottle is completely dry, taking out the weighing bottle over 2 hours generally, placing the weighing bottle in the dryer for cooling, weighing the weight W3 after cooling, and calculating the solid content G according to the following formula: g ═ W3-W1 × 100%/W2.
The results of the tests are shown in the following table 1:
TABLE 1
As can be seen from the detection results in table 1, compared with the products in the prior art, the aqueous starch adhesive in embodiments 1 to 3 of the present invention has a lower viscosity, so that the aqueous starch adhesive can be more easily coated on corrugated paper, and on the other hand, the solid content of the aqueous starch adhesive is much higher than that of the existing products (about 3 times that of the existing products), so that the aqueous starch adhesive only needs a smaller amount of glue when applied to the mounting and compounding of corrugated paper, and meanwhile, the high solid content also means a smaller water content, and the energy consumption for drying and drying when applied to the mounting and compounding of corrugated paper can be reduced, for example, the oven length of the mounting and compounding machine is reduced, the drying and drying temperature is reduced, the process time is reduced, the turnover period of the semi-finished product processing can be shortened, and the production and.
Test two
The prepared counter-mounted composite corrugated board products of application examples 1-3 are subjected to performance detection of the water content, the composite tearing strength and the weather resistance of the following corrugated counter-mounted paper;
the comparative application example is as follows: the water-based starch adhesive product of the comparative example is prepared into a mounting composite corrugated board product according to the preparation method of the application example, and the mounting composite corrugated board product is a product of the comparative application example.
The counter-mounted composite corrugated board products of application examples 1-3 and the products of the comparative application examples, are referred to as "samples" below.
The water content of the corrugated mounting paper is as follows: the pointer of the humidity detector is poked into the surface to the deep of the sample by force, simultaneously, a test key is pressed, and after the display lamp is stabilized, the index beside the display lamp is the water content of the sample, and the unit is;
the composite tearing strength of the corrugated paper to the mounting paper is as follows: respectively cutting rectangular samples with short sides in the corrugated direction of the samples, wherein the size of the rectangular samples is 25 x 80 mm; the size error is +/-1 mm, and the number of samples is 10; loading the sample into a needle type attachmentA component, which is placed in the central position of a lower pressure plate of a ZYD-2 type electronic compression instrument; starting the compression instrument to apply pressure until the ridges and the surface paper (or the medium paper) are separated; directly reading pressure value data to 1N, and obtaining pressure value data with P ═ F × 103The bond strength is calculated by the formula/L in N/m. (wherein R means vertical edge bond strength and F means maximum pressure)<N>L denotes the dimension of the long side of the sample<mm>) The average value was taken as the adhesive strength.
The weather resistance of the corrugation to the mounting paper is as follows: cutting the sample into 5 pieces of 100mm × 100mm sheets; placing the sheet in a constant temperature and humidity instrument with the temperature of 60 ℃ and the humidity of 80 percent RH for 8 hours; the corrugated surface paper and the corrugated core paper are manually stripped in a constant temperature and humidity box to check whether the corrugated surface paper and the corrugated core paper can be stripped.
The results of the tests are shown in the following table 2:
TABLE 2
As can be seen from the detection results in Table 2, compared with the products of the comparative application examples, the water content of the paper of the products of the application examples 1 to 3 obtained by applying the water-based starch adhesive of the embodiments 1 to 3 of the invention is far lower than that of the existing products (about one third of the water content of the products of the comparative application examples), and the products have higher composite tearing strength and good flexibility after being cured into a film; more importantly, the paper corrugated box prepared by the water-based starch adhesive of the embodiments 1 to 3 can be applied in high-temperature and high-humidity environment, and can be suitable for storage and transportation in high-temperature and high-humidity environment.
It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (5)
1. The preparation method of the water-based starch adhesive is characterized by comprising the following steps:
the raw material formula comprises the following components in parts by weight based on 100 parts by weight of the water-based starch adhesive:
50-70% of starch
21 to 42 g of water
1.8-3.5% of alpha-amylase
5 to 10 parts of a crosslinking agent
Wherein the cross-linking agent is a carbodiimide cross-linking agent;
the preparation method comprises the following steps:
step 1): weighing the water and the alpha-amylase according to the raw material formula, adding the water and the alpha-amylase into a reaction kettle, and stirring and mixing uniformly;
step 2): weighing the starch according to the raw material formula, slowly adding the starch into the reaction kettle while stirring at the speed of 300-350 r/min, and gradually heating the reaction kettle from room temperature; based on 100 parts by weight of the starch adhesive, the feeding speed of the starch is 1.7-4.5 parts/min, the heating speed of the reaction kettle is 1-2 ℃/min, and all feeding is completed before the temperature of the reaction kettle is raised to 60 ℃; after the feeding is finished, heating the reaction kettle to 80-85 ℃, keeping the constant temperature, maintaining the stirring speed, and reacting for 50-70 minutes;
step 3): weighing the cross-linking agent according to the raw material formula, slowly adding the cross-linking agent into the reaction kettle while stirring at the speed of 300-350 r/min, maintaining the temperature at 80-85 ℃, and reacting for 50-70 minutes;
step 4): cooling the material obtained in the step 3) to 30-40 ℃.
2. The method of claim 1, wherein:
the raw material formula also comprises 0.1-0.3 part by weight of a sterilization preservative based on 100 parts by weight of the starch adhesive;
in the step 4), after the temperature of the material is reduced to 30-40 ℃, the sterilizing preservative is weighed according to the raw material formula and added into the material, and the mixture is stirred and mixed uniformly.
3. The method of claim 1, wherein:
the starch is corn native starch or cassava native starch.
4. A starch adhesive obtainable by the process according to any one of claims 1 to 3, wherein:
the viscosity of the starch adhesive is 400-1000 cps, and the solid content is 50-70%.
5. Use of the starch adhesive of claim 4 for the bonding of corrugated board.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5405437A (en) * | 1993-06-01 | 1995-04-11 | National Starch And Chemical Investment Holding Corporation | All natural, starch-based, water resistant corrugating adhesive |
| CN103669109A (en) * | 2013-12-13 | 2014-03-26 | 陕西科技大学 | Preparation method for paper-making sizing agent |
| CN108753202A (en) * | 2018-05-31 | 2018-11-06 | 东华大学 | A kind of two-component hydrogel adhesive and its preparation and application |
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2021
- 2021-02-05 CN CN202110164216.1A patent/CN112940645B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5405437A (en) * | 1993-06-01 | 1995-04-11 | National Starch And Chemical Investment Holding Corporation | All natural, starch-based, water resistant corrugating adhesive |
| CN103669109A (en) * | 2013-12-13 | 2014-03-26 | 陕西科技大学 | Preparation method for paper-making sizing agent |
| CN108753202A (en) * | 2018-05-31 | 2018-11-06 | 东华大学 | A kind of two-component hydrogel adhesive and its preparation and application |
Non-Patent Citations (1)
| Title |
|---|
| 诸葛健等: "《工业微生物实验技术手册》", 30 June 1994, 中国轻工业出版社 * |
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