阅读说明：本技术 一种低温热封胶及其制备方法 (Low-temperature heat-sealing adhesive and preparation method thereof ) 是由 黄宏存 朱清梅 胡远南 陈招强 于 2021-09-24 设计创作，主要内容包括：本发明提供了一种低温热封胶,其由特定含量的水性丙烯酸乳液、水性蜡乳液、水性EAA乳液制备得到。本申请还提供了低温热封胶的制备方法。本申请提供的低温热封胶适用于铝箔,其涂布于铝箔上,改善了铝箔的热封性能,使其封口温度在70℃达到3.0N/15mm,实现了低温热封性,且热封温度高于铝箔在运输过程中的环境温度,不会造成产品粘连,在保障低温热封的同时具有非常好的防粘效果,使用时可以涂布或涂抹,非常适用于糖果、巧克力等对热敏感性食品的软包装。(The invention provides a low-temperature heat-sealing adhesive which is prepared from aqueous acrylic emulsion, aqueous wax emulsion and aqueous EAA emulsion with specific contents. The application also provides a preparation method of the low-temperature heat-sealing adhesive. The application provides a low temperature heat-seal glue is applicable to the aluminium foil, it coats on the aluminium foil, the heat sealability of aluminium foil has been improved, make its sealing temperature reach 3.0N 15mm at 70 ℃, low temperature heat-sealability has been realized, and the heat-seal temperature is higher than the ambient temperature of aluminium foil in the transportation, can not cause the product adhesion, have very good antiseized effect when guaranteeing low temperature heat-seal, can coat or paint during the use, be applicable to very much the soft-packing to heat sensitivity food such as candy, chocolate.)

1. The low-temperature heat-sealing glue is prepared from the following components:

10-30 parts of water-based acrylic emulsion;

1-3 parts of water-based wax emulsion;

70-90 parts by weight of an aqueous EAA emulsion;

the water-based acrylic emulsion is prepared from the following raw materials: methyl acrylate and methacrylate: 25-35 wt%, butyl acrylate: 3-8 wt%, styrene: 2-10 wt%, acid monomer: 0.1-0.5 wt%, crosslinking monomer: 1-3 wt% of an emulsifier: 0.1-1.0 wt%, initiator: 0.1-0.5 wt%, ammonia water: 0.01-0.1 wt%, organosilicon defoamer: 0.05-0.25 wt% of water and the balance of water;

the aqueous EAA emulsion is prepared from the following raw materials: 65-70 wt% of soft water, 20-30 wt% of EAA copolymer, 3-5 wt% of emulsifier, and ammonia water: 0.5-2.0 wt%, curing agent: 0.5 to 5 wt%.

2. The low-temperature heat-seal glue of claim 1, wherein in the aqueous acrylic emulsion, the acidic monomer is selected from one or more of methacrylic acid, itaconic acid and maleic acid, the crosslinking monomer is selected from one or more of ethylene glycol dimethacrylate, butanediol dimethacrylate, triethylene glycol dimethacrylate and trimethylolpropane trimethacrylate, the emulsifier is selected from anionic emulsifiers, and the initiator is selected from persulfate.

3. The low-temperature heat-seal adhesive is characterized in that in the EAA emulsion, the EAA copolymer is selected from polymers with the melting point of 40-65 ℃, the emulsifier is selected from nonionic emulsifiers, and the curing agent is selected from one or more of epoxy curing agent, polyurethane curing agent and aziridine.

4. The low-temperature heat-seal adhesive of claim 1, wherein the solid content of the aqueous acrylic emulsion is 40-45%, and the solid content of the aqueous EAA emulsion is 30-35%.

5. The low-temperature heat-seal adhesive of claim 1, wherein the content of the aqueous acrylic emulsion is 15-27 parts by weight.

6. The low-temperature heat-seal adhesive is characterized in that the content of the aqueous EAA emulsion is 75-85 parts by weight.

7. The low temperature heat-seal adhesive of claim 1, wherein the aqueous wax emulsion is selected from one of palm wax, polyethylene wax and oxidized polyethylene wax.

8. The preparation method of the low-temperature heat-seal adhesive as claimed in any one of claims 1 to 7, which comprises the following steps:

adding aqueous acrylic emulsion into the aqueous EAA emulsion according to the proportion, reacting, and then adding aqueous wax emulsion to obtain low-temperature heat-seal adhesive;

the preparation method of the water-based EAA emulsion comprises the following steps:

mixing 10% of soft water and an emulsifier according to a ratio to obtain an emulsifier solution;

mixing the rest soft water, EAA copolymer, emulsifier solution and ammonia water, heating, and adding curing agent to obtain aqueous EAA emulsion;

the preparation method of the water-based acrylic emulsion comprises the following steps:

mixing water, methyl acrylate, methacrylate, butyl acrylate, styrene, an acidic monomer, a crosslinking monomer and an emulsifier according to a ratio, heating, adding an initiator after reaction, continuing the reaction, and finally adding an organic silicon defoamer and ammonia water to obtain the aqueous acrylic emulsion.

9. The preparation method of claim 8, wherein in the preparation process of the aqueous EAA emulsion, the heating temperature is 90-100 ℃ and the heating time is 1-2 h; in the preparation process of the water-based acrylic emulsion, the heating temperature is 80-100 ℃ and the time is 2-3 h.

Technical Field

The invention relates to the technical field of high polymer materials, in particular to a low-temperature heat-sealing adhesive and a preparation method thereof.

Background

The packaging heat-sealing glue is mainly used in the fields of daily chemical products, food packaging, liquid flexible packaging and the like. The leakage is most easily generated at the heat sealing position of the package when the product is filled, and most of the damage of the package bag is generated at the heat sealing part in practical use, so that the selection of the proper heat sealing material with higher heat sealing strength is particularly important. The existing packaging material has poor low-temperature heat sealing performance and high seal-opening temperature, needs at least more than 100 ℃, and is difficult to meet the requirements of the existing low-temperature heat sealing packaging.

Chinese patent with publication number CN103952095B discloses a high-temperature-resistant heat-sealing adhesive applied to packaging of medicinal aluminum foil and a preparation method thereof, and the high-temperature-resistant heat-sealing adhesive is composed of the following raw materials in parts by weight: 12-14 parts of dimethyl dichlorosilane, 24-26 parts of ethyl acetate, 12-14 parts of methyl ethyl ketone, 20-24 parts of EVA emulsion, 1-2 parts of isotridecyl alcohol polyoxyethylene ether, 2-3 parts of aniline methyl triethoxysilane, 1-2 parts of tert-butyl hydroperoxide, 4-5 parts of acrylonitrile, 6-7 parts of isoprene, 1-2 parts of rosin acid polyoxyethylene ester and 4-5 parts of tackifying auxiliary agent, wherein the seal initiation temperature of the heat seal adhesive is 150 ℃. Chinese patent with publication number CN105111976B provides an emulsion composition for water-based aluminum foil heat sealing, which comprises the following components in certain proportion: acrylic emulsion, EAA emulsion, cosolvent, inorganic adhesion promoter and water; the formed emulsion is coated on an aluminum foil substrate, the dry weight per square meter is 5g, the drying is carried out at the temperature of 150 ℃ for 10S, and the aluminum foil and a non-polar substrate PP are subjected to heat sealing at the temperature of 180 ℃ for 4Mpa/3S after drying, so that the heat sealing strength of 13N/15mm is obtained. The Chinese patent with the publication number of CN103059213B relates to a low-temperature heat-sealing acrylic emulsion and a preparation method and application thereof, the method is prepared by polymerizing seed emulsion and adding a proper amount of microcrystalline wax after vacuum desorption, and is mainly applied to packaging heat-sensitive foods such as chocolate and the like, but the heat-sealing temperature of an emulsion coating reaches more than or equal to 12N/15mm at 40-48 ℃, and because the unsealing temperature of the product is too low, the environmental temperature of the product often exceeds 40 ℃ in the transportation process, the adhesion of the product is easily caused, and the popularization in the market is difficult.

In view of the above analysis, there is a need to develop a low-temperature heat-sealing coating (heat-sealing strength at 70 ℃ is more than or equal to 3.0N/15mm) suitable for aluminum foil packaging.

Disclosure of Invention

The invention aims to provide a low-temperature heat-sealing adhesive which realizes low-temperature heat sealing and has a good anti-sticking effect.

In view of the above, the application provides a low-temperature heat-sealing adhesive, which is prepared from the following components:

10-30 parts of water-based acrylic emulsion;

1-3 parts of water-based wax emulsion;

70-90 parts by weight of an aqueous EAA emulsion;

the water-based acrylic emulsion is prepared from the following raw materials: methyl acrylate and methacrylate: 25-35 wt%, butyl acrylate: 3-8 wt%, styrene: 2-10 wt%, acid monomer: 0.1-0.5 wt%, crosslinking monomer: 1-3 wt% of an emulsifier: 0.1-1.0 wt%, initiator: 0.1-0.5 wt%, ammonia water: 0.01-0.1 wt%, organosilicon defoamer: 0.05-0.25 wt% of water and the balance of water;

the aqueous EAA emulsion is prepared from the following raw materials: 65-70 wt% of soft water, 20-30 wt% of EAA copolymer, 3-5 wt% of emulsifier, and ammonia water: 0.5-2.0 wt%, curing agent: 0.5 to 5 wt%.

Preferably, in the aqueous acrylic emulsion, the acidic monomer is selected from one or more of methacrylic acid, itaconic acid and maleic acid, the crosslinking monomer is selected from one or more of ethylene glycol dimethacrylate, butanediol dimethacrylate, triethylene glycol dimethacrylate and trimethylolpropane trimethacrylate, the emulsifier is selected from anionic emulsifiers, and the initiator is selected from persulfate.

Preferably, in the EAA emulsion, the EAA copolymer is selected from polymers with the melting point of 40-65 ℃, the emulsifier is selected from nonionic emulsifiers, and the curing agent is selected from one or more of epoxy curing agent, polyurethane curing agent and aziridine.

Preferably, the solid content of the aqueous acrylic emulsion is 40-45%, and the solid content of the aqueous EAA emulsion is 30-35%.

Preferably, the content of the aqueous acrylic emulsion is 15-27 parts by weight.

Preferably, the content of the aqueous EAA emulsion is 75-85 parts by weight.

Preferably, the aqueous wax emulsion is selected from one of palm wax, polyethylene wax and oxidized polyethylene wax.

The application also provides a preparation method of the low-temperature heat-seal adhesive, which comprises the following steps:

adding aqueous acrylic emulsion into the aqueous EAA emulsion according to the proportion, reacting, and then adding aqueous wax emulsion to obtain low-temperature heat-seal adhesive;

the preparation method of the water-based EAA emulsion comprises the following steps:

mixing 10% of soft water and an emulsifier according to a ratio to obtain an emulsifier solution;

mixing the rest soft water, EAA copolymer, emulsifier solution and ammonia water, heating, and adding curing agent to obtain aqueous EAA emulsion;

the preparation method of the water-based acrylic emulsion comprises the following steps:

mixing water, methyl acrylate, methacrylate, butyl acrylate, styrene, an acidic monomer, a crosslinking monomer and an emulsifier according to a ratio, heating, adding an initiator after reaction, continuing the reaction, and finally adding an organic silicon defoamer and ammonia water to obtain the aqueous acrylic emulsion.

Preferably, in the preparation process of the aqueous EAA emulsion, the heating temperature is 90-100 ℃ and the time is 1-2 h; in the preparation process of the water-based acrylic emulsion, the heating temperature is 80-100 ℃ and the time is 2-3 h.

The application provides a low-temperature heat-seal adhesive which is prepared from water-based acrylic emulsion, water-based wax emulsion and water-based EAA emulsion with specific contents, wherein the water-based acrylic emulsion and the water-based EAA emulsion are prepared from specific components; acrylic acid in the water-based acrylic emulsion provided by the application and carboxyl groups in an EAA molecular chain are subjected to cross-linking reaction to generate a compact high polymer molecular group to form a high polymer chain segment, and the compact high polymer chain segments in a molten viscous flow state can be tightly permeated and wound with each other under the hot pressing condition of 70 ℃, so that sufficient van der Waals force can be generated among molecules, the connection of the heat sealing surfaces is tight enough, and the coating achieves excellent heat sealing strength at 70 ℃; meanwhile, the emulsifier of a proper type is selected, the integral glass transition temperature of the coating can be increased, and the anti-adhesion condition of the coating of the terminal packaging product in the transportation process is improved under the condition that the temperature of the coating meets 70 ℃ and the heat seal condition is met.

Detailed Description

For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.

In view of the problem that the low-temperature heat sealing performance of the packaging heat sealing glue in the prior art is not good, the application provides the low-temperature heat sealing glue which is particularly suitable for the low-temperature heat sealing glue for the aluminum foil, the low-temperature heat sealing glue is coated on the aluminum foil, the heat sealing performance of the aluminum foil is improved, the sealing temperature of the aluminum foil reaches 3.0N/15mm at 70 ℃, the low-temperature heat sealing performance is realized, the heat sealing temperature is higher than the environmental temperature of the aluminum foil in the transportation process, product adhesion cannot be caused, a good anti-sticking effect is achieved while the low-temperature heat sealing is guaranteed, the low-temperature heat sealing glue can be coated or coated during use, and the low-temperature heat sealing glue is very suitable for flexible packages of candies, chocolates and other heat sensitive foods. Specifically, the embodiment of the invention discloses a low-temperature heat-sealing adhesive which is prepared from the following components:

10-30 parts of water-based acrylic emulsion;

1-3 parts of water-based wax emulsion;

70-90 parts by weight of an aqueous EAA emulsion;

the water-based acrylic emulsion is prepared from the following raw materials: methyl acrylate and methacrylate: 25-35 wt%, butyl acrylate: 3-8 wt%, styrene: 2-10 wt%, acid monomer: 0.1-0.5 wt%, crosslinking monomer: 1-3 wt% of an emulsifier: 0.1-1.0 wt%, initiator: 0.1-0.5 wt%, ammonia water: 0.01-0.1 wt%, organosilicon defoamer: 0.05-0.25 wt% of water and the balance of water;

the aqueous EAA emulsion is prepared from the following raw materials: 65-70 wt% of soft water, 20-30 wt% of EAA copolymer, 3-5 wt% of emulsifier, and ammonia water: 0.5-2.0 wt%, curing agent: 0.5 to 5 wt%.

The low-temperature heat-seal adhesive is prepared from water-based acrylic emulsion, water-based wax emulsion and water-based EAA emulsion; the water-based acrylic emulsion provides cross-linked acrylate macromolecules, the water-based EAA emulsion provides EAA polymer macromolecules and carboxyl groups in the molecules, dense high polymer molecular groups can be generated after cross-linking reaction of the water-based acrylic emulsion and the water-based EAA emulsion, high polymer chain segments are formed, a molten viscous flow state is treated under the hot-pressing condition of 70 ℃, the dense high polymer chain segments can be tightly permeated and wound, sufficient van der Waals force can be generated between the molecules, the heat-sealing surfaces are tightly connected, and finally the heat-sealing adhesive achieves excellent heat-sealing strength at 70 ℃; the water-based wax emulsion can increase the smoothness of the emulsion after forming a coating.

More specifically, the aqueous acrylic emulsion is prepared from the following raw materials: methyl acrylate and methacrylate: 25-35 wt%, butyl acrylate: 3-8 wt%, styrene: 2-10 wt%, acid monomer: 0.1-0.5 wt%, crosslinking monomer: 1-3 wt% of an emulsifier: 0.1-1.0 wt%, initiator: 0.1-0.5 wt%, ammonia water: 0.01-0.1 wt%, organosilicon defoamer: 0.05 to 0.25 wt% of water, and the balance of water.

In the aqueous acrylic emulsion, acidic monomers and crosslinking monomers have polymerization reaction with molecules in a system, and the molecules are grafted and crosslinked through covalent bonds.

More specifically, the methyl acrylate, the methacrylate, the butyl acrylate and the styrene are main components in the emulsion, the content of the methyl acrylate and the methacrylate is 25-35 wt%, and more specifically, the content of the methyl acrylate and the methacrylate is 28-32 wt%; the content of the modified starch is low and cannot reach the expected effect of the emulsion, the performance is poor, and the content is high and the dissolution difficulty is high.

The acidic monomer and the crosslinking monomer are important components participating in polymerization and crosslinking reaction, the acidic monomer is selected from one or more of methacrylic acid, itaconic acid and maleic acid, and the crosslinking monomer is selected from one or more of ethylene glycol dimethacrylate, butanediol dimethacrylate, triethylene glycol dimethacrylate and trimethylolpropane trimethacrylate. The content of the acidic monomer is 0.1-0.5 wt%, more specifically, the content of the acidic monomer is 0.2-0.4 wt%, the content of the crosslinking monomer is 1-3 wt%, more specifically, the content of the crosslinking monomer is 1.5-2.5 wt%. When the content of the acidic monomer and the crosslinking monomer is low, the main body reaction in the system is incomplete, and when the content is high, a large amount of gel can be generated in the emulsion.

The emulsifier can ensure that substances such as monomers with poor water solubility and the like are dispersed into small droplets to fully react; the emulsifier is selected from anionic emulsifiers, in particular from one or more of alkali metal and ammonium salts of sulfated fatty alcohols, aromatic sulfonic acids and sulfonated ethylene oxide adducts. The content of the emulsifier is 0.1-1.0 wt%, more specifically, the content of the emulsifier is 0.3-0.7 wt%. The low content of the emulsifier has poor emulsifying effect and is easy to generate local burst aggregation, and the high content of the emulsifier can cause more foam and increased viscosity of the emulsion.

The initiator is used for initiating polymerization and crosslinking reaction of a system, and is selected from persulfate and sodium bisulfite, specifically, the initiator is selected from one or two of potassium persulfate and ammonium persulfate, and the content of the initiator is 0.1-0.5 wt%, more specifically, the content of the initiator is 0.2-0.4 wt%. The low content of the initiator can lead to incomplete reaction of the system and failure of the expected effect, and the high content can lead to violent collision of particles in the system and easy generation of gel.

The ammonia water is used for adjusting the pH value, the content of the ammonia water is 0.01-0.1 wt%, and more specifically, the content of the ammonia water is 0.03-0.07 wt%.

The silicone defoamer is to eliminate foam. The content of the organic silicon defoaming agent is 0.05-0.25 wt%, and more specifically, the content of the organic silicon defoaming agent is 0.10-0.20 wt%.

The aqueous EAA emulsion is prepared by emulsifying and compounding an EAA copolymer, and has good adhesion.

Specifically, the EAA copolymer is the main component of the aqueous EAA emulsion and is selected from polymers with the melting point of 40-65 ℃, and the content of the EAA copolymer is 20-30 wt%, more specifically 23-26 wt%. If the content of the EAA copolymer is too high, the dissolution difficulty increases, and the effect thereof is difficult to achieve.

The emulsifier is used for well dissolving the EAA copolymer in water and is selected from nonionic emulsifiers, more specifically, the emulsifier is selected from one or two of alkylphenol polyoxyethylene and high-carbon fatty alcohol polyoxyethylene, and the content of the emulsifier is 3-5 wt%.

The ammonia water is used for adjusting the pH value of the system, the content of the ammonia water is 0.5-2.0 wt%, and more specifically the content of the ammonia water is 0.8-1.5 wt%.

The curing agent is used for improving the film forming effect of the EAA emulsion, and the content of the curing agent is 0.5-5 wt%, more specifically 1.5-3.5 wt%.

In the application, the solid content of the aqueous acrylic emulsion is 40-45 wt%, and the solid content of the aqueous EAA emulsion is 30-35 wt%; the content of the water-based acrylic emulsion is 10-30 parts by weight, more specifically, the content of the water-based acrylic emulsion is 15-27 parts by weight, the content of the water-based EAA emulsion is 70-90 parts by weight, and more specifically, the content of the water-based EAA emulsion is 75-85 parts by weight. The content of the aqueous wax emulsion is 1-3 parts by weight, and the aqueous wax emulsion is specifically selected from one of palm wax, polyethylene wax and oxidized polyethylene wax. If the content of the aqueous acrylic emulsion or the aqueous EAA emulsion is too low, the molecules of the crosslinking reaction are insufficient, and if the content of the aqueous acrylic emulsion or the aqueous EAA emulsion is high, the reaction cannot be completed. If the content of the water-based wax emulsion is too low, the smooth effect cannot be achieved, if the content of the water-based wax emulsion is too high, the water-based wax emulsion is seriously layered, and the friction force of the coating is too low.

The application also provides a preparation method of the low-temperature heat-seal adhesive, which comprises the following steps:

adding aqueous acrylic emulsion into the aqueous EAA emulsion according to the proportion, reacting, and then adding aqueous wax emulsion to obtain low-temperature heat-seal adhesive;

the preparation method of the water-based EAA emulsion comprises the following steps:

mixing 10% of soft water and an emulsifier according to a ratio to obtain an emulsifier solution;

mixing the rest soft water, EAA copolymer, emulsifier solution and ammonia water, heating, and adding curing agent to obtain aqueous EAA emulsion;

the preparation method of the water-based acrylic emulsion comprises the following steps:

mixing water, methyl acrylate, methacrylate, butyl acrylate, styrene, an acidic monomer, a crosslinking monomer and an emulsifier according to a ratio, heating, adding an initiator after reaction, continuing the reaction, and finally adding an organic silicon defoamer and ammonia water to obtain the aqueous acrylic emulsion.

In the process of preparing the low-temperature heat-seal adhesive, in order to make the raw materials fully play roles, the application firstly prepares the water-based EAA emulsion and the water-based acrylic emulsion respectively.

In the process of preparing the water-based acrylic emulsion, the mixing is carried out in a stirring manner, the stirring speed is 500-1000 r/min, the heating temperature is 80-100 ℃, and the reaction time is 2-3 h.

In the process of preparing the aqueous EAA emulsion, the heating temperature is 90-100 ℃ and the time is 1-2 h.

In the preparation process of the low-temperature heat-seal adhesive, the reaction temperature is 0.5-1 h, and the stirring time after the water-based wax emulsion is added is 10 min-1 h.

For further understanding of the present invention, the low temperature heat-sealing adhesive and the preparation method thereof provided by the present invention are described in detail below with reference to the following examples, and the scope of the present invention is not limited by the following examples.

Examples

1) Preparation of aqueous EAA emulsion:

adding 10% of soft water into a mixing tank, adding a weighed emulsifier, stirring, fully dissolving and mixing to prepare an emulsifier solution;

adding 90% of soft water into a high-temperature high-pressure reaction kettle according to the weight ratio, then adding weighed EAA copolymer, emulsifier solution and ammonia water, stirring the reaction kettle at the stirring speed of 2500-3000 r/min, starting heating, keeping the temperature for 1h when the temperature reaches 95-98 ℃, then keeping the constant temperature at the temperature, dropwise adding a curing agent, keeping the constant speed, controlling the time to finish dropwise adding within 0.5h, keeping the temperature for 1h after dropwise adding the curing agent, standing, cooling, filtering and discharging to obtain the aqueous EAA emulsion with the solid content of 20-30%.

2) Preparation of aqueous acrylic emulsion:

adding soft water into a high-temperature high-pressure reaction kettle according to the weight ratio, adding weighed acrylic ester, methacrylic ester, butyl acrylate, styrene, an acidic monomer, a crosslinking monomer and an emulsifier, stirring the reaction kettle at a speed of 500-1000 r/min, starting heating, reacting at a constant temperature of 8-90 ℃ for 2 hours, then starting dropwise adding an initiator, predicting that dropwise adding is finished for 3-4.5 hours, continuing to keep the temperature for 1 hour to complete the reaction, finally cooling to below 40 ℃, discharging, adding an antifoaming agent, and adjusting the pH to 8-8.5 by using ammonia water to obtain the aqueous acrylic emulsion.

3) Preparing the low-temperature heat-sealing adhesive for the water-based aluminum foil:

the water-based acrylic emulsion (solid content: 40-45%): 10-30%;

aqueous wax emulsion: 1-3%;

the water-based EAA emulsion (solid content: 30-35%): 70-90%;

adding the aqueous EAA emulsion into a batching tank according to the weight ratio, starting a stirring device, setting the rotating speed at 1500r/min, slowly pouring the aqueous acrylic emulsion under continuous stirring, continuously stirring for 0.5h to enable the aqueous acrylic emulsion to fully react, then adding the aqueous wax emulsion, and stirring for 15min to enable the aqueous acrylic emulsion to be uniformly mixed, thereby obtaining the low-temperature heat-sealing adhesive for the aqueous aluminum foil.

The following table shows the specific embodiments of the examples and comparative examples:

TABLE 1 summary of experimental protocols for examples and comparative examples

Additive and addition amount (%)	Example 1	Example 2	Example 3	Comparative example 1	Comparative example 2
						Aqueous acrylic emulsion	10	18	27	18	18
EAA emulsion	89	80	70	80	80
						Aqueous wax emulsion	1	2	3	2	2

TABLE 2 component data of aqueous acrylic emulsions in the examples

In table 2, the acidic monomer is selected from itaconic acid, the crosslinking monomer is selected from triethylene glycol dimethacrylate, the emulsifier is selected from sodium dodecyl sulfate, the initiator is selected from sodium persulfate, and the defoamer is selected from silicone defoamer.

TABLE 3 composition data of EAA emulsions in the examples

In table 3, the emulsifier is selected from tribenzylphenol polyoxyethylene ether and the curing agent is selected from polyurethane curing agent.

TABLE 4 summary of experimental results of examples and comparative examples

Note: comparative example 1 aqueous acrylic acid the final product prepared using the example of chinese patent CN 202010606408.9;

the EAA emulsion in comparative example 2 used the final product prepared in the example of chinese patent CN 202110402446.7;

comparative example 3 the final product prepared using the examples of chinese patent CN 103059213B;

testing of heat seal strength: testing according to a national standard method GB/T22638.7-2016;

the anti-sticking effect test method comprises the following steps: coating the emulsion in the above examples on an aluminum foil product, drying and curing to obtain a finished product, preparing 10 groups of samples with the size of 200mm multiplied by 200mm in each example, respectively stacking the samples in a constant temperature and humidity box at 40 ℃, standing for 48h, taking out, and observing whether the samples have adhesion and stickiness;

and (3) testing the adhesion of the coating: the test was carried out according to the standard method ISO 2409-2013 "test for drawing lots of paints and varnishes".

The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.