Glue for cold-setting corrugated board production line and preparation method thereof

Abstract

The invention relates to the technical field of glue, in particular to glue special for a cold-setting corrugated board production line and a preparation method thereof.The glue is prepared from, by weight, 1.4 parts of water, 1 part of adhesive, 0.1 part of catalyst, 0.1 part of adhesive medium, 0.5 part of filler, 1 part of drying agent and 0.1 part of dispersing agent. And preparing the special glue for the cold-setting corrugated board production line. The glue prepared by the invention has the advantages of strong adhesive force and high solid content, can effectively increase the gram weight and the strength of paper, and is high in drying speed during use; energy consumption can be effectively saved, the physical index of paper is guaranteed to the maximum extent, the flatness of the paper is good, and operation of the next procedure is facilitated; the glue prepared by the method is applied to a cold setting corrugated board production line, production can be carried out without any heating, the production cost is effectively saved, and the glue is safe and environment-friendly.

Description

Technical Field

[0001] The invention relates to the technical field of glue, in particular to a preparation method of glue for a cold-setting corrugated paperboard production line and the glue. Background Art

[0002] Corrugated cardboard is a plate-like material made by gluing noodle paper and corrugated paper formed by corrugating rollers. Corrugated cardboard is made by gluing face paper, lining paper, core paper and corrugated paper processed into corrugated waves with corrugated paper glue.

[0003] According to the needs of product packaging, corrugated cardboard can be processed into single-sided corrugated cardboard or multi-layer corrugated cardboard. Single-sided corrugated cardboard is generally used as a lining protective layer for product packaging or to make lightweight card grids and pads to protect products from vibration or collision during storage and transportation.

[0004] The glue ingredients of traditional corrugated board production lines are corn starch, water, and caustic soda. This glue must be gelatinized at high temperature when used; therefore, the gelatinization temperature must be maintained after being applied to the corrugated paper, and sufficient heat must be provided to evaporate the water. Because the water content of traditional glue is about 75%, a large amount of energy must be used to heat the starch to gelatinize and evaporate the water, and the faster the production speed, the more energy is consumed.

[0005] For example, the Chinese patent with application number: 201810937701.6 discloses a water-soluble adhesive with a high solid content, which is composed of 1 part of solid protein glue, 0.05-1.5 parts of magnesium sulfate, 0.5-2.5 parts of filler, and 0.5-1.5 parts of water. The filler is calcium carbonate powder, and the magnesium sulfate is magnesium sulfate heptahydrate. After the solid protein is mixed with water, it is stirred evenly; magnesium sulfate heptahydrate is added while stirring the protein and water, and the mixture of protein, water, and magnesium sulfate heptahydrate is stirred for 10-15 minutes, and calcium carbonate powder is added, and stirred evenly to make a water-soluble adhesive.

[0006] During the production of corrugated cardboard, glue is applied on the tip of the corrugated board. The existing glue has a low solid content, and glue flow problems will occur during the gluing process. Summary of the invention

[0007] To this end, the technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a glue for a cold-set corrugated cardboard production line and a preparation method thereof. The glue prepared by the method is applied to the production line and can be produced without any heating, which can effectively save production costs, is safe, environmentally friendly, and saves energy.

[0008] According to the technical solution provided by the present invention: the glue for the cold-setting corrugated cardboard production line comprises, by weight, 1.4-3 parts of water, 1 part of adhesive, 0.1-0.4 parts of catalyst, 0.1-0.3 parts of adhesive medium, 0.5-5 parts of filler, 1-10 parts of desiccant and 0.1-1.0 parts of dispersant. The above components are added into a stirrer in batches and stirred evenly to prepare the special glue for the cold-setting corrugated cardboard production line.

[0009] As a further improvement of the present invention, the adhesive is modified starch or self-gelatinized starch.

[0010] As a further improvement of the present invention, the catalyst is magnesium sulfate; and the binding medium is ferrous sulfate.

[0011] As a further improvement of the present invention, the filler is calcium carbonate.

[0012] As a further improvement of the present invention, the desiccant is one or more of ethyl acetate, ethanol, propanol or butanol.

[0013] As a further improvement of the present invention, the model of the dispersant is DK-016.

[0014] A method for preparing glue for a cold-set corrugated cardboard production line, wherein the formula ratio is calculated by weight, and the glue for a cold-set corrugated cardboard production line comprises the following preparation steps: S1. Add 1.4-3 parts of water and 1 part of adhesive into a stirrer, stir at 30-40°C, at a stirring speed of 110-130 r / min, and for 4-8 min; S2. Add 0.1-0.4 parts of catalyst and 0.1-0.3 parts of binding medium to the mixture of step S1 respectively, and continue stirring at a stirring speed of 60-80 r / min and a stirring time of 25-35 min; S3, add 0.5-5 parts of filler to the mixture prepared in step S2 and continue stirring. The stirring speed is 60-80r / min, and the stirring time is 15-25min; S4. Add 1-10 parts of desiccant and 0.1-1.0 parts of dispersant to the mixture prepared in step S3, respectively, and stir evenly to prepare a special glue for cold-setting corrugated board production line.

[0015] As a further improvement of the present invention, in step S4, the stirring speed is 60-80 r / min, and the stirring time is 15-25 min.

[0016] As a further improvement of the present invention, the solid content of the glue is 75%.

[0017] As a further improvement of the present invention, the adhesive is modified starch or self-gelatinized starch; the catalyst is magnesium sulfate; the bonding medium is ferrous sulfate; the filler is calcium carbonate; the desiccant is one or more of ethyl acetate, ethanol, propanol or butanol; and the model of the dispersant is DK-016.

[0018] The above technical solution of the present invention has the following advantages compared with the prior art: The glue prepared by the present invention has strong bonding force and high solid content, can effectively increase the grammage and strength of paper, and the glue dries quickly during use; the glue of the present invention is applied to the cold-setting corrugated board production line, and does not need to use boilers or oil furnaces for gelatinization at high temperature, thereby effectively saving energy consumption, avoiding the damage to the physical indicators of paper caused by high-temperature gelatinization in the prior art, and can guarantee the physical indicators of paper to the greatest extent, the paper has good flatness, and is convenient for the next process operation. The glue prepared by the method is applied to the cold-setting corrugated board production line, and can be produced without any heating, effectively saving production costs, and being safe and environmentally friendly. Due to the use of glue with high solid content, the physical indicators of paper can be guaranteed to the greatest extent. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0020] Example 1 The special glue for cold-setting corrugated cardboard production line of the present invention comprises, by weight, 1.4 parts of water, 1 part of adhesive, 0.1 part of catalyst, 0.1 part of bonding medium, 0.5 part of filler, 1 part of desiccant and 0.1 part of dispersant. The above components are added into a stirrer in batches and stirred evenly to prepare the special glue for cold-setting corrugated cardboard production line.

[0021] The adhesive is modified starch or self-gelatinized starch; the catalyst is magnesium sulfate; the bonding medium is ferrous sulfate; the filler is calcium carbonate; the desiccant is one or more of ethyl acetate, ethanol, propanol or butanol; the model of the dispersant is DK-016.

[0022] The present invention provides a method for preparing glue for a cold-set corrugated cardboard production line, comprising the following steps: The formula ratio is calculated by weight, and the glue for the cold-set corrugated cardboard production line comprises the following preparation steps: S1. Select 1.4 parts of water and 1 part of adhesive and add them into a stirrer to stir into a mixture. The water temperature is controlled at 30°C and the stirring time is 4 minutes. The adhesive is modified starch. The stirrer is a reactor with a rotation speed of 110 r / min.

[0023] S2. Add 0.1 parts of catalyst and 0.1 parts of binding medium to the mixture prepared in step S1 respectively, and continue to stir to form a mixture for 25 min. The catalyst is magnesium sulfate, and the stirring speed is 60 r / min. The binding medium is ferrous sulfate.

[0024] S3. Add 0.5 parts of filler to the mixture prepared in step S2 and continue stirring. The stirring time is 15 minutes. The stirring speed is 60 r / min. The filler is calcium carbonate.

[0025] S4. According to climate change, changes in working environment temperature and humidity, one portion of desiccant needs to be added during the preparation of the special glue for cold-setting corrugated cardboard production line. The desiccant is ethyl acetate; the stirring speed is 60r / min and the stirring time is 15min.

[0026] S5. In order to avoid glue agglomeration during the glue production process, 0.1 part of dispersant should be added to the special glue for cold-setting corrugated board production line. The model of dispersant is DK-016. Dispersant has the function of dispersing and dissolving, which can avoid glue agglomeration during the production process, thereby improving the fluidity of the final glue and facilitating glue application. The stirring speed is 60r / min and the stirring time is 15min.

[0027] The mixture is stirred evenly to prepare glue for cold-setting corrugated board production line, wherein the solid content of the glue can reach 75%.

[0028] Example 2 The present invention provides a method for preparing glue for a cold-set corrugated cardboard production line, wherein the formula ratio is calculated by weight, and the glue for the cold-set corrugated cardboard production line comprises the following preparation steps: S1. Take 3 parts of water and 1 part of adhesive and add them into a stirrer to stir into a mixture. The water temperature is controlled at 40°C and the stirring time is 8 minutes. The adhesive is self-gelatinized starch. The stirrer is a reactor and the stirring speed is 130r / min.

[0029] S2. Add 0.4 parts of catalyst and 0.3 parts of bonding medium to the mixture prepared in step S1 and continue to stir to form a mixture for 35 minutes; the catalyst is magnesium sulfate, the stirring speed is 80r / min; the bonding medium is ferrous sulfate. Ferrous sulfate can fully connect various composite surfaces, increase viscosity, and increase permeability.

[0030] S3. Add 5 parts of filler to the mixture prepared in step S2 and continue stirring. The stirring time is 25 minutes. The stirring speed is 80 r / min. The filler is calcium carbonate.

[0031] S4. According to climate change, changes in working environment temperature and humidity, 8 parts of desiccant need to be added during the preparation of the special glue for cold-setting corrugated cardboard production line. The desiccant is ethanol; the stirring speed is 60r / min and the stirring time is 25min.

[0032] S5. In order to prevent glue from agglomerating during the glue production process, 0.8 parts of dispersant should be added to the glue for cold-setting corrugated board production line. The dispersant model is DK-016. The stirring speed is 60r / min, the stirring time is 25min, and the glue is stirred evenly to make the glue for cold-setting corrugated board production line. The solid content of the glue can reach 75%.

[0033] Example 3 The present invention provides a method for preparing glue for a cold-set corrugated cardboard production line, wherein the formula ratio is calculated by weight, and the glue for the cold-set corrugated cardboard production line comprises the following preparation steps: S1. Take 2.2 parts of water and 1 part of adhesive and add them into a stirrer to stir into a mixture. The water temperature is controlled at 37° C. and the stirring time is 5 minutes. The adhesive is modified starch or self-gelatinized starch. The stirrer is a reactor and the stirring speed is 120 r / min.

[0034] S2. Add 0.25 parts of catalyst and 0.2 parts of bonding medium to the mixture prepared in step S1 and continue to stir to form a mixture for 30 minutes; the catalyst is magnesium sulfate, the stirring speed is 70r / min; the bonding medium is ferrous sulfate. Ferrous sulfate can fully connect various composite surfaces, increase viscosity, and increase permeability.

[0035] S3. Add 2.75 parts of filler to the mixture prepared in step S2 and continue stirring. The stirring time is 20 minutes. The stirring speed is 70 r / min. The filler is calcium carbonate.

[0036] S4. According to climate change, changes in working environment temperature and humidity, 5 parts of desiccant shall be added to the special glue for cold-setting corrugated cardboard production line during preparation. The desiccant is one or more of ethyl acetate, ethanol, propanol or butanol; the stirring speed is 70r / min, and the stirring time is 20min.

[0037] S5. In order to prevent glue from agglomerating during the glue production process, 0.5 parts of dispersant should be added to the glue for cold-setting corrugated board production line. The dispersant model is DK-016. The stirring speed is 70r / min, the stirring time is 20min, and the glue is stirred evenly to make glue for cold-setting corrugated board production line. The solid content of the glue can reach 75%.

[0038] The catalyst in the above three embodiments of the present invention is magnesium sulfate, which is crystalline at a moisture content of less than 15%, thereby accelerating the curing of the glue and having a certain viscosity. During operation, after the moisture of the glue is absorbed by the paper during the gluing process, the glue cures quickly, and magnesium sulfate is cheap, which is convenient for large-scale application.

[0039] The ferrous sulfate in the above three embodiments can fully connect various composite surfaces during the use of glue, thereby increasing viscosity and permeability.

[0040] The initial viscosity of the glue of the present invention can reach about 1000 centipoise. When working, it can realize rapid bonding of paper. Due to less water absorption, it can realize energy-saving, high efficiency and high quality effects of the corrugated production line. What is particularly important is that it can be suitable for cold-setting production, and no longer needs to be heated by a thermal machine to gelatinize the glue, which can effectively save energy.

[0041] The glue of the present invention has a higher solid content than the existing glue. During operation, during the gluing process, the glue will not flow randomly due to the high fluidity of the glue when gluing the flute tip of the corrugated paper, which will affect the bonding of the corrugated paper and the face paper, as the existing glue has a low solid content and a large amount of water. During the operation, after gluing the flute tip, the corrugated paper will absorb a large amount of water due to the flow of the glue, so that when the corrugated paper and the face paper are bonded, the back of the corrugated paper will leave multiple marks due to the water absorption. The bonding of the face paper and the corrugated paper requires heating and drying with a heat machine. After the produced corrugated paperboard is made into a carton, when the subsequent printing operation is carried out, the surface of the corrugated paperboard box corresponds to the flute tip position, and after the glue is dried, flute marks are formed one by one, thereby affecting the effect of printing patterns on the surface of the corrugated paperboard box. The high solid content glue of the present invention has high solid content, and when being glued to the flute tip of corrugated paper, the glue has good stability after gluing, and the moisture content of the glue is low, so that no mark is formed on the surface paper corresponding to the flute tip, thereby affecting the subsequent printing effect.

[0042] Secondly, due to the high solid content of the glue of the present invention, during production, the paper can be bonded quickly, and due to the low water absorption, the paper deformation is small, and a very high adhesive force is generated; after the glue of the present invention is applied to the corrugated production line, it has the effects of energy saving, high efficiency and high quality. However, due to the low solid content and high water content of the glue used in the existing corrugated board production line, the corrugated board line must be gelatinized at high temperature during production operations, and the physical indicators of the base paper are destroyed to a great extent by repeated high temperature and high humidity. In addition, the traditional corrugated board production line uses caustic soda as a catalyst, which is easy to absorb water and return to moisture. The glue of the present invention can effectively solve the above technical problems.

[0043] The invention adds a dispersant to prevent the particles from aggregating with each other, and has good thermal stability. The advantages of the glue of the invention and the ordinary glue in application are compared: there are two major types of starch glue compounded with paper, one of which is called raw glue, that is, it is mainly raw starch; it must be heated by energy during use, which results in high cost, large pollution and low efficiency. The other is cooked glue, which is called mounting glue in the packaging industry. This glue has low solid content, high water content and fast penetration. The biggest disadvantage is that after water penetration, the two sheets of paper that are attached together will have different swelling and accommodation coefficients. Therefore, in order to prevent the two layers of glued paper from moving during the swelling and accommodation process, it must be pressed for some time to be firm. Then, the excess water evaporates naturally. Due to the high water content and the difference in the fibers of the two attached papers, the accommodation after drying is different, so the curling and unevenness will occur, which will not only affect the subsequent processing and cause waste, but also reduce the appearance and performance of the formed products. The high-solid content glue of the present invention has a solid content of more than 70 percent. Therefore, when used, the curing time is short, the paper absorbs less water, and thus the deformation is small and no pressure is required. Therefore, in addition to solving the problems of the original glue, the high-solid content glue also increases the strength of the product, reduces the curing time, and can increase the speed by about two times, thereby increasing the efficiency by more than two times.

[0044] The ferrous sulfate in the present invention can play a good role as a medium, has good affinity with paper and glue, and realizes reliable bonding. The desiccant can effectively accelerate the drying speed of the glue during use. The filler is low in price and can effectively increase the solid content, and when used, it increases the strength of paper and the grammage of paper.

[0045] The glue prepared by the present invention can have a solid content of 75%, less water content, fast drying speed, high strength, no deformation of paper, no need for high-temperature gelatinization, and can effectively reduce carbon emissions and reduce manufacturing costs. When the glue of the present invention is used on a corrugated board production line, it is no longer necessary to use a boiler or an oil furnace for heating, thereby effectively saving energy consumption; at the same time, the existing glue has a high water content, and during production, the glue is gelatinized under heating conditions, so that the processing and production environment becomes a high-temperature and high-humidity environment, which will destroy the physical indicators of the paper, while the present invention uses a high-solid content glue, which can guarantee the physical indicators of the paper to the greatest extent.

[0046] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. A glue for cold-setting corrugated board production line, characterized by: The formula ratio is calculated by weight and includes: 1.4-3 parts of water, 1 part of adhesive, 0.1-0.4 parts of catalyst, 0.1-0.3 parts of adhesive medium, 0.5-5 parts of filler, 1-10 parts of desiccant and 0.1-1.0 parts of dispersant. The above components are added into a stirrer in batches and stirred evenly to prepare a special glue for cold-setting corrugated board production line.

2. The glue for cold-setting corrugated board production line according to claim 1, characterized in that: The adhesive is modified starch or self-gelatinized starch.

3. The glue for cold-setting corrugated board production line according to claim 1, characterized in that: The catalyst is magnesium sulfate; the bonding medium is ferrous sulfate.

4. The glue for cold-setting corrugated board production line according to claim 1, characterized in that: The filler is calcium carbonate.

5. The glue for cold-setting corrugated board production line according to claim 1, characterized in that: The desiccant is one or more of ethyl acetate, ethanol, propanol or butanol.

6. The glue for cold-setting corrugated board production line according to claim 1, characterized in that: The model of the dispersant is DK-016.

7. A method for preparing glue for cold-setting corrugated board production line, characterized in that: The formula ratio is calculated by weight, and the glue for cold-setting corrugated board production line includes the following preparation steps: S1. Add 1.4-3 parts of water and 1 part of adhesive into a stirrer, stir at 30-40°C, at a stirring speed of 110-130 r / min, and for 4-8 min; S2. Add 0.1-0.4 parts of catalyst and 0.1-0.3 parts of binding medium to the mixture of step S1 respectively, and continue stirring at a stirring speed of 60-80 r / min and a stirring time of 25-35 min; S3, add 0.5-5 parts of filler to the mixture prepared in step S2 and continue stirring. The stirring speed is 60-80r / min, and the stirring time is 15-25min; S4. Add 1-10 parts of desiccant and 0.1-1.0 parts of dispersant to the mixture prepared in step S3, respectively, and stir evenly to prepare a special glue for cold-setting corrugated board production line.

8. The method for preparing glue for cold-setting corrugated board production line according to claim 7, characterized in that: In step S4, the stirring speed is 60-80 r / min, and the stirring time is 15-25 min.

9. The method for preparing glue for cold-setting corrugated board production line according to claim 7, characterized in that: The solid content of the glue is 75%.

10. The method for preparing glue for cold-setting corrugated board production line according to claim 7, characterized in that: The adhesive is modified starch or self-gelatinized starch; the catalyst is magnesium sulfate; the bonding medium is ferrous sulfate; the filler is calcium carbonate; the desiccant is one or more of ethyl acetate, ethanol, propanol or butanol; the model of the dispersant is DK-016.