阅读说明：本技术 一种胶水及其制备方法 (Glue and preparation method thereof ) 是由 傅秋佳 梁奕昆 于 2021-07-07 设计创作，主要内容包括：本申请公开了一种胶水及其制备方法,该胶水以重量份数计包括：预聚物10％-15％,有机溶剂12％-15％,支撑剂10％-15％,保护剂10％-15％,水25％-28％。通过上述方式,本申请能够将薄膜与纸板牢固的粘合,不易脱胶。(The application discloses glue and a preparation method thereof, wherein the glue comprises the following components in parts by weight: 10-15% of prepolymer, 12-15% of organic solvent, 10-15% of propping agent, 10-15% of protective agent and 25-28% of water. Through the mode, this application can be with firm bonding of film and cardboard, and difficult coming unstuck.)

1. The glue is characterized by comprising the following components in parts by weight:

10-15% of prepolymer, 12-15% of organic solvent, 10-15% of propping agent, 10-15% of protective agent and 25-28% of water.

2. The glue of claim 1, wherein the prepolymer comprises at least one of a vinyl acetate-ethylene polymer or an acrylate polymer.

3. The glue of claim 1, wherein the organic solvent comprises at least one of glycerol or butylene glycol.

4. The glue of claim 1, wherein the proppant comprises at least one of starch or cellulose.

5. The glue of claim 1, wherein the protective agent comprises at least one of polyvinyl alcohol, gelatin, polyvinyl pyrrolidone, or an acrylate.

6. The glue of claim 1, wherein the prepolymer is vinyl acetate-ethylene in a weight ratio of 10% to 15%; the organic solvent is glycerol, the weight percentage is 12% -15%, the propping agent is starch, and the weight percentage is 12% -15%; the protective agent is polyvinyl alcohol, and the weight percentage is 10% -15%.

7. The glue of claim 5,

the weight ratio of the vinyl acetate to the ethylene is 35%, the weight ratio of the glycerol is 13%, the weight ratio of the starch is 13%, the weight ratio of the polyvinyl alcohol is 12% and the weight ratio of the water is 27%.

8. A preparation method of glue is characterized by comprising the following steps:

mixing a protective agent, glycerol and a prepolymer to form a component A;

mixing the proppant with water to obtain component B;

mixing the component A and the component B to prepare a water-in-oil solution;

and converting the water-in-oil solution into an oil-in-water solution to prepare the glue.

9. The method of claim 8, wherein said converting said water-in-oil solution into an oil-in-water solution comprises:

and treating the water-in-oil solution by using ultrasonic waves to convert the water-in-oil solution into an oil-in-water solution.

10. The glue preparation method according to claim 9, wherein the frequency of the ultrasonic wave is 20-40 KHz.

Technical Field

The application relates to the field of adhesion, in particular to glue and a preparation method thereof.

Background

In recent years, the packaging industry has been rapidly developed, and the functional requirements of the packaging paperboard are higher and higher while the demand of customers for packaging is gradually increased. The paperboard is made of paper, and the waterproof and moistureproof performance of the paper product is poor. The problems of easy ulceration, insufficient compression resistance and the like after the paperboard is affected with damp are difficult to provide effective protection for products. After the paper board and the plastic film are combined, the product is packaged, so that the waterproof and moisture-proof performance of the package can be effectively improved. When the paper board covered with the film is used for packaging products, the requirement on the composite firmness of the film and the paper board is extremely high. Especially when packing high product, the viscose department can receive very strong pulling force after the packing is formed. The inventor of the application finds that after the existing glue is used for compounding the film paper, the glue is frequently degummed, and the paper board and the film are easy to separate.

Disclosure of Invention

The technical problem that this application mainly solved provides a glue and preparation method thereof, can be with firm bonding of film and cardboard, difficult degumming.

In order to solve the technical problem, the application adopts a technical scheme that: providing a glue which comprises the following components in parts by weight: 10-15% of prepolymer, 12-15% of organic solvent, 10-15% of propping agent, 10-15% of protective agent and 25-28% of water.

Wherein the prepolymer comprises at least one of a vinyl acetate-ethylene polymer or an acrylate polymer.

Wherein the organic solvent comprises at least one of glycerol or butanediol.

Wherein the proppant comprises at least one of starch or cellulose.

Wherein the protective agent comprises at least one of polyvinyl alcohol, gelatin, polyvinylpyrrolidone or acrylate.

Wherein the prepolymer is vinyl acetate-ethylene, and the weight percentage is 10-15%; the organic solvent is glycerol with the weight percentage of 12-15 percent, the propping agent is starch with the weight percentage of 12-15 percent; the protective agent is polyvinyl alcohol, and the weight percentage is 10-15%.

Wherein the weight ratio of the vinyl acetate to the ethylene is 35%, the weight ratio of the glycerol is 13%, the weight ratio of the starch is 13%, the weight ratio of the polyvinyl alcohol is 12%, and the weight ratio of the water is 27%.

In order to solve the above technical problem, another technical solution adopted by the present application is: the preparation method of the glue is provided, and comprises the following steps: mixing a protective agent, an organic solvent and a prepolymer to form a component A; mixing the proppant with water to obtain component B; mixing the component A and the component B to prepare a water-in-oil type solution; and (3) converting the water-in-oil solution into an oil-in-water solution to obtain the glue.

Wherein converting the water-in-oil solution to an oil-in-water solution comprises: and treating the water-in-oil solution by using ultrasonic waves to convert the water-in-oil solution into an oil-in-water solution.

Wherein the frequency of the ultrasonic wave is 20-40 KHz.

The beneficial effect of this application is: being different from the situation of the prior art, the application provides a glue which comprises the following components in parts by weight: 10-15% of prepolymer, 12-15% of organic solvent, 10-15% of propping agent, 10-15% of protective agent and 25-28% of water. According to the glue provided by the application, the protective agent is used for protecting the prepolymer, so that the prepolymer can be kept stable, and the stability of the glue is improved. After heating or natural volatilization, the protective agent can volatilize along with the solvent and initiate the prepolymer to perform polycondensation reaction to form a high-molecular chain polymer, so that the glue has stronger adhesive property.

Drawings

FIG. 1 is a schematic flow chart of a method for preparing glue according to an embodiment of the present application;

FIG. 2 is a flow chart illustrating a method for applying glue according to an embodiment of the present application;

FIG. 3 is a schematic diagram of a tensile test configuration according to an embodiment of the present application.

Detailed Description

In order to make the purpose, technical solution and effect of the present application clearer and clearer, the present application is further described in detail below with reference to the accompanying drawings and examples.

When packaging articles with a cardboard to which a film is attached, the glue bond between the film and the cardboard is subjected to a certain tensile force. Especially, when some products with higher heights are packaged, the pulling force born by glue between the film and the paperboard is larger, so that the problems of degumming and the like are more likely to occur, the film is separated from the paperboard, and the packaging and the use cannot be carried out.

In order to solve the above technical problem, the present application provides a glue, which includes: prepolymer, organic solvent, proppant, protective agent and water. The glue provided by the application can be used for bonding and fixing the paper board and the plastic film in the film packaging. The glue can firmly bond the paper board and the plastic film together, and the problems of degumming and the like still can not occur when bearing higher tensile force.

In one embodiment, the glue comprises, by weight, 10% -15% of a prepolymer, 12% -15% of an organic solvent, 10% -15% of a proppant, 10% -15% of a protective agent and 25% -28% of water.

Prepolymer refers to a low molecular weight polymer previously polymerized from monomers. During the use process of the glue, the prepolymer can be subjected to polycondensation reaction again to form a polymer with higher molecular weight, so that the viscosity of the glue is enhanced, and two objects are bonded and fixed together. In one embodiment, the prepolymer includes at least one of a vinyl acetate-ethylene polymer or an acrylate polymer. Among them, Ethylene Vinyl Acetate (EVA), also called ethylene vinyl acetate, is a thermoplastic resin obtained by copolymerizing a nonpolar ethylene monomer and a strongly polar vinyl acetate monomer, and has a strong adhesive property. The vinyl acetate-ethylene can bond various materials, and has specific bonding property for materials which are difficult to bond, such as polyethylene, polypropylene, polyvinyl chloride, polyester and the like, besides materials such as wood, leather, fabrics, paper, cement, concrete, aluminum foil, galvanized steel plate and the like. Acrylic polymer (Anionic polymer) is a polymer obtained by polymerizing acrylic acid and its derivatives, and has good adhesive properties. Further, the prepolymer may be a vinyl acetate-ethylene polymer. In one embodiment, the weight ratio of vinyl acetate to ethylene in the glue is 35%.

The proppant may be an auxiliary agent that provides a supporting function when the glue is bonded. In an embodiment, the proppant comprises at least one of starch or cellulose. The starch can play a certain supporting role for the glue after gelatinization. Similarly, cellulose has certain adhesive properties and can provide support for glue. Further, the proppant may be starch. In one embodiment, the weight ratio of starch in the glue is 13%.

The protective agent may be a protective colloid, an emulsifier, or the like, and is capable of providing protection to the prepolymer and stabilizing the prepolymer. The protective agent can protect the stability of the prepolymer by physisorption and chemical graft adsorption of the water-soluble polymer onto the colloidal particles. The protective agent comprises at least one of polyvinyl alcohol, gelatin, polyvinylpyrrolidone or acrylate. Further, the protective agent may be polyvinyl alcohol. Polyvinyl alcohol (PVA) is a compound produced by alcoholysis of polyvinyl acetate. In one embodiment, the weight ratio of the polyvinyl alcohol in the glue is 12%.

The organic solvent may serve to dissolve the prepolymer. At the same time, the organic solvent also needs to have good volatility. In one embodiment, the organic solvent comprises at least one of glycerol or butanediol. Further, the organic solvent may be glycerol. The glycerin can dissolve the prepolymer and can also play roles in adhesion, moisture retention and the like. Glycerol, also known as glycerol, is miscible with water, alcohols, amines and phenols in any proportion. I.e., glycerol is capable of both dissolving the prepolymer and being miscible with water. In one embodiment, the weight ratio of glycerin in the glue is 13%. In one embodiment, the water is present at 27% by weight.

According to the glue provided by the application, the protective agent is used for protecting the prepolymer, so that the prepolymer can be kept stable, and the stability of the glue is improved. After heating or natural volatilization, the protective agent can volatilize along with the solvent and initiate the prepolymer to perform polycondensation reaction to form a high-molecular chain polymer, so that the glue has stronger adhesive property.

Different from the prior art, the application also provides a preparation method of the glue. Referring to fig. 1, fig. 1 is a schematic flow chart illustrating a glue preparation method according to an embodiment of the present application. It should be noted that, if the result is substantially the same, the flow sequence shown in fig. 1 is not limited in this embodiment. As shown in fig. 1, the method includes:

and step S110, mixing the protective agent, the organic solvent and the prepolymer to form a component A.

Adding the protective agent into an organic solvent, uniformly mixing, then adding the prepolymer into the organic solvent, and uniformly mixing to form the component A.

And step S120, mixing the propping agent with water to prepare a component B.

Adding the proppant into water to form a proppant solution, namely the component B.

And step S130, mixing the component A and the component B to prepare the water-in-oil solution.

And adding the component B into the component A, and stirring and mixing uniformly to obtain the water-in-oil solution.

And step S140, converting the water-in-oil solution into an oil-in-water solution to obtain the glue.

The liquid phase of the water-in-oil solution can be changed by any method to convert the water-in-oil solution into the oil-in-water emulsion, thereby obtaining the stable suspension mixed emulsion. In one embodiment, the water-in-oil solution is treated with ultrasonic waves to convert the water-in-oil solution to an oil-in-water solution. In one embodiment, the frequency of the ultrasonic waves is 20-40 KHz. Further, the water-in-oil solution was treated with ultrasonic waves at 40KHz for 5 min.

According to the preparation method provided by the application, the water-in-oil type solution is converted into the oil-in-water type emulsion through treatment, so that the glue is more stable and is easy to store.

The application method of the glue provided by the embodiment of the application is shown in figure 2. Fig. 2 is a flow chart illustrating a method for using glue according to an embodiment of the present application. It should be noted that, if the result is substantially the same, the flow sequence shown in fig. 2 is not limited in this embodiment. As shown in fig. 2, the method includes: cutting the paper board, feeding paper into a laminating device, and then coating glue on the paper board. And simultaneously, die cutting is carried out on the film, and the film is sent to laminating equipment. And (3) coating the film and the paperboard. Specifically, the film is aligned with the glued portion of the cardboard, and then pressure is applied by the pressing plate, the film being bonded to the glued portion of the cardboard, without the glued portion separating. After pressing, the film and the paperboard are combined preliminarily. And finally, drying the paper board coated with the film. Specifically, the paper board covered with the film is placed into a hot-drying machine for local hot-drying. Since the area for applying glue is only on both sides of the board, the hot-drying pipes can be arranged only on both sides of the board for hot-drying. For example, the temperature of the hot baking can be 120 ℃ to 130 ℃, and the time of the hot baking can be 50s to 60 s. After the heat drying, the glue between the paper board and the film is dried, and the paper board and the film are bonded and fixed.

The present application will now be illustrated and explained by means of several groups of specific examples, which should not be taken to limit the scope of the present application.

According to the embodiment provided by the application, glue with different components is manufactured, and the performance of the obtained glue is tested, wherein the test method comprises the following steps:

tension test

The cardboard is cut into the shape shown in fig. 3. FIG. 3 is a schematic diagram of a tensile test configuration according to an embodiment of the present application. Glue is applied and dried in the area of the glue area 330 between the sheet 31 and the film 32. The fixing area 310 of the fixing sheet 31 is held by the lower jig, and the fixing area 320 of the fixing film 32 is held by the upper jig. At 0 ° and 180 ° of film 32 to paperboard 31, tension was applied to film 32 to score the amount of tension applied when film 32 was peeled from paperboard 31 as the peel strength of the glue.

The preparation method of the glue with different components comprises the following steps: adding the protective agent into an organic solvent, uniformly mixing, then adding the prepolymer into the organic solvent, and uniformly mixing to form the component A. Adding the proppant into water to form a proppant solution, namely the component B. And adding the component B into the component A, and stirring and mixing uniformly to obtain the water-in-oil solution. And treating the water-in-oil solution with ultrasonic wave at 40KHz for 5min to convert the water-in-oil solution into oil-in-water solution. The concrete component ratios of the glue of each example are shown in table 1.

TABLE 1 glue ingredient table

For the test results of examples 1-2 and comparative example, please refer to table 2. The comparative example was a photocurable glue.

TABLE 2 Property parameters of the different component ratios of the glue

As can be seen from the data in Table 2, the glue provided by the application can meet the requirements that after the film and the paperboard are compounded, the peel strength is not lower than 18N when the included angle between the film and the paperboard is 0 degrees, and the peel strength is not lower than 80N when the included angle between the film and the paperboard is 180 degrees. The glue that this application provided can satisfy the product packaging protection requirement. Particularly, after the glue in the embodiment 2 is compounded with the film and the paperboard, the peel strength is not lower than 20N when the included angle between the film and the paperboard is 0 degrees, and the peel strength is not lower than 80N when the included angle between the film and the paperboard is 180 degrees.

According to the embodiment, the glue provided by the application is verified by comparing and analyzing the glue with different component proportions and the adhesive property of the comparative example, so that the glue is applicable to the adhesive fixation of the plastic film and the paperboard, has strong adhesive property, and can effectively avoid the problems of degumming between the paperboard and the film, separation of the film and the paperboard and the like.

The above embodiments are merely examples and are not intended to limit the scope of the present disclosure, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present disclosure or those directly or indirectly applied to other related technical fields are intended to be included in the scope of the present disclosure.