CN112760061A - Environment-friendly bi-component EVA adhesive, preparation method, application and packaging product thereof - Google Patents
Environment-friendly bi-component EVA adhesive, preparation method, application and packaging product thereof Download PDFInfo
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- CN112760061A CN112760061A CN202110080018.7A CN202110080018A CN112760061A CN 112760061 A CN112760061 A CN 112760061A CN 202110080018 A CN202110080018 A CN 202110080018A CN 112760061 A CN112760061 A CN 112760061A
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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
- C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
- C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
- C09J123/04—Homopolymers or copolymers of ethene
- C09J123/08—Copolymers of ethene
- C09J123/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
- C09J123/0853—Vinylacetate
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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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Abstract
The invention relates to an environment-friendly bi-component EVA adhesive, a preparation method, application and a packaging product thereof, wherein the environment-friendly bi-component EVA adhesive comprises a component A and a component B, and is characterized in that: the component A is prepared from the following components in parts by weight: 100-200 parts of EVA emulsion, 10-20 parts of polyvinyl alcohol and 50-100 parts of deionized water; the component B comprises the following components in parts by weight: 1-5 parts of titanium acetylacetonate solution and 100-500 parts of organic solvent; the mass ratio of the component A to the component B is 100: (1-10). The environment-friendly bi-component EVA adhesive provided by the invention can meet the environment-friendly requirement, improve the adhesive strength and further accelerate the curing speed. The prepared bi-component environment-friendly adhesive can meet the use requirements of high-grade luxury packaging bags through various tests on effect and use performance, and the finished product is firm in bonding and good in stability, can be used for an automatic adhesive spraying technology, and realizes automatic production operation.
Description
Technical Field
The invention relates to the technical field of adhesives, in particular to an environment-friendly bi-component EVA adhesive, a preparation method, an application and a packaging product thereof.
Background
With the development of the packaging industry, the using amount of the adhesive is continuously increased, and the using amount of the adhesive in the packaging industry worldwide exceeds 35% of the total amount, so higher requirements on the environmental protection property, the adhesive strength and the drying speed of the adhesive used for packaging paper bags are provided. At present, in the field of high-grade packaging, in order to improve the environmental protection and market competitiveness of products, a paper bag made of kraft paper, paperboard and other materials is used for replacing a plastic bag. The hot melt adhesive is generally used for adhesion between the handle rope and the paper bag, but the environmental protection property of the used hot melt adhesive cannot meet the production requirements of enterprises, so that the adhesive with the water-based property of environmental protection is generally selected, but the strength of the common water-based adhesive is not high and the solidification speed is low, so that the improvement of the productivity of the enterprises is limited.
The AB glue achieves the bonding purpose by utilizing the instant reaction of the A glue and the B glue, and has advantages in the setting speed, such as: the invention patent application CN112048273A discloses an environment-friendly glue and its preparation and application, the main component of component A is bisphenol F type epoxy resin; the main component of the component B is a mixture of isocyanate, polyether polyol and a small amount of a coagent, namely methyl acetate. The two components are mixed, and then a small amount of color paste and bonding auxiliary agents are added to prepare the bi-component glue. The glue is simple in preparation method, does not need a reaction kettle or heating treatment, has good bonding performance on the basis of meeting the environmental protection requirement, has good bonding stability on a finished product, and does not have the phenomena of falling and separation.
The invention patent application CN109536048A discloses an environment-friendly composite film, glue used by the environment-friendly composite film and a preparation method of the environment-friendly composite film, wherein the A component of the environment-friendly composite film mainly comprises the following raw materials: 110-125 parts of polyvinyl alcohol, 8-15 parts of polyacrylamide, 3-6 parts of emulsifier, 1.5-3.5 parts of diisocyanate, 150-200 parts of acetone/ethanol mixed solvent and the like; the main raw materials of the component B are as follows: 30-70 parts of butyl methacrylate, 20-60 parts of ethyl acrylate, 20-30 parts of isooctyl enoate, 12-25 parts of tung oil anhydride, 80-120 parts of acetone/ethanol mixed solvent and the like. The A, B components of the glue are prepared by respectively heating and refluxing, then mixing at a ratio of 1:1.3 to obtain a two-component glue, and curing under pressure or ultraviolet irradiation. The prepared bi-component adhesive is low in toxicity and few in solvent residue, and the adhesive force of the adhesive can meet the bonding requirement of the composite film while the environmental protection is guaranteed.
Although the two kinds of double-component glue ensure environmental protection and improve the adhesive force of the double-component glue, the drying speed of the glue after use is not greatly improved, which limits the production of products. And the preparation method of the second adhesive is too complex, the process is complicated, the second adhesive is not suitable for large-scale production and application, and the curing speed of the obtained adhesive is not fundamentally solved.
Disclosure of Invention
The invention aims to overcome the problems of low drying speed and low strength of the colloid in the prior packaging field, and provides an environment-friendly bi-component EVA adhesive, which is prepared by blending polyvinyl alcohol and EVA emulsion, and mixing the polyvinyl alcohol and the EVA emulsion with a diluted titanium acetylacetonate solution during application, so that the drying speed after glue application is improved while the strength and the environmental protection are ensured, the quick drying is realized, the production efficiency is improved, and the attractiveness and the market competitiveness of high-grade luxury packaging bags are improved to a great extent.
The invention also provides a preparation method of the environment-friendly bi-component EVA adhesive, which comprises a preparation method of the component A and a preparation method of the component B, wherein the component A is prepared from the following components in parts by weight: 100-200 parts of EVA emulsion, 10-20 parts of polyvinyl alcohol and 50-100 parts of deionized water, and the EVA emulsion and the component B can be mixed to form glue meeting the requirements in the proportion. When the component A is prepared, deionized water and polyvinyl alcohol are added into a reaction kettle and heated to 70-90 ℃ under the stirring condition, the temperature is kept for 30-40 min, the obtained solution is cooled to 40-60 ℃, the EVA emulsion is added after the temperature is kept for 10-15min, and the mixture is fully stirred and reacted for 1-2 h at the temperature, and in the process, proper heating temperature and enough long heating time are ensured, so that the EVA emulsion and the polyvinyl alcohol are uniformly mixed, the phenomenon that the molecular mass distribution is not uniform during the crosslinking reaction is avoided, and the bonding strength is reduced.
The component B comprises the following components in parts by weight: 1-5 parts of titanium acetylacetonate solution and 100-500 parts of organic solvent, and because titanium acetylacetonate is difficult to dissolve, the problem of crystallization of the dissolved titanium acetylacetonate solution is easy to occur at room temperature, so that A, B components cannot be well mixed. Therefore, the titanium acetylacetonate solution is preferably prepared by dispersing titanium acetylacetonate in an isopropanol aqueous solution, wherein the volume fraction of the isopropanol aqueous solution is 20-30%, the mass content of titanium in the titanium acetylacetonate solution is 9-15%, and the proportion is a precondition for ensuring that the titanium acetylacetonate can be fully dissolved. The preparation method of the component B preferably comprises the following steps: SB1, weighing the raw materials according to the weight parts, adding the organic solvent and the titanium acetylacetonate solution into a reaction kettle, fully heating to 160 ℃, and stirring for 30-60min to uniformly mix; and SB2, and carrying out ultrasonic treatment on the solution obtained in the step S1 for 1-2 hours by using an ultrasonic instrument after the solution is cooled to room temperature, so that the titanium acetylacetonate is fully dissolved, and partial crystals are prevented from being precipitated in the standing process at room temperature.
The invention also protects the application of the environment-friendly bi-component EVA adhesive and a packaging product bonded by the adhesive, wherein the A component and the B component are mixed and then are rapidly cured within 10-60 min at 40-50 ℃, or can be naturally cured after standing at 25-30 ℃, the shear strength of a colloid is more than or equal to 175N after standing for 24h, and the adhesive requirement between a handle and a bag body of a paper bag is met.
The specific scheme is as follows:
the environment-friendly bi-component EVA adhesive comprises a component A and a component B, wherein the component A is prepared from the following components in parts by weight: 100-200 parts of EVA emulsion, 10-20 parts of polyvinyl alcohol and 50-100 parts of deionized water;
the component B comprises the following components in parts by weight: 1-5 parts of titanium acetylacetonate solution and 100-500 parts of organic solvent;
the mass ratio of the component A to the component B is 100: (1-10).
Further, the component A is prepared from the following components in parts by weight: 120-180 parts of EVA emulsion, 12-18 parts of polyvinyl alcohol and 50-100 parts of deionized water.
Further, the component B comprises the following components in parts by weight: 2-4 parts of titanium acetylacetonate solution and 150-450 parts of organic solvent.
Further, the mass ratio of the component A to the component B is 100: (2-8).
Further, the EVA emulsion is a solution containing an ethylene-vinyl acetate copolymer, and the mass proportion of vinyl acetate in the ethylene-vinyl acetate copolymer is 20-45%;
optionally, the molecular weight of the polyvinyl alcohol is 7000-10000.
Further, the titanium acetylacetonate solution is prepared by dispersing titanium acetylacetonate in an isopropanol aqueous solution, wherein the volume fraction of the isopropanol aqueous solution is 20-30%, and the mass content of titanium in the titanium acetylacetonate solution is 9-15%;
optionally, the organic solvent is at least one of xylene, isopropanol or ethyl acetate.
The invention also provides a preparation method of the environment-friendly bi-component EVA adhesive, which comprises the preparation method of the component A and comprises the following steps:
SA1, weighing the raw materials according to the weight parts, adding deionized water and polyvinyl alcohol into a reaction kettle, heating to 70-90 ℃ under the stirring condition, and preserving heat for 30-40 min;
SA2, cooling the solution obtained in the step S1 to 40-60 ℃, preserving heat for 10-15min, adding EVA emulsion, and fully stirring and reacting for 1-2 h at the temperature;
SA3, cooling the reaction solution to room temperature after the reaction is finished to obtain the component A;
and/or a preparation method of the component B, which comprises the following steps:
SB1, weighing the raw materials according to the weight parts, adding the organic solvent and the titanium acetylacetonate solution into a reaction kettle, fully heating to 160 ℃, and stirring for 30-60min to uniformly mix;
SB2, and cooling the solution obtained in the step S1 to room temperature, and then carrying out ultrasonic treatment for 1-2 hours by using an ultrasonic instrument to obtain the component B.
Further, the EVA emulsion is a solution containing an ethylene-vinyl acetate copolymer, and the mass proportion of vinyl acetate in the ethylene-vinyl acetate copolymer is 20-45%;
optionally, the molecular weight of the polyvinyl alcohol is 7000-10000;
optionally, the titanium acetylacetonate solution is prepared by dispersing titanium acetylacetonate in an isopropanol aqueous solution, wherein the volume fraction of the isopropanol aqueous solution is 20-30%, and the mass content of titanium in the titanium acetylacetonate solution is 9-15%;
optionally, the organic solvent is at least one of xylene, isopropanol or ethyl acetate.
The invention also protects the application of the environment-friendly bi-component EVA adhesive in the field of packaging, and the component A and the component B are mixed and then quickly cured within 10-60 min at the temperature of 40-50 ℃ or naturally cured by standing at the temperature of 25-30 ℃.
The invention also protects a packaging product which is bonded by adopting the environment-friendly bi-component EVA adhesive.
In the present invention, the EVA emulsion is a commercially available product, and is a solution containing an ethylene-vinyl acetate copolymer, and generally toluene or xylene is used as a solvent. Preferably, the mass concentration of the ethylene is 5-30%, and the balance is the solvent. The EVA emulsion in the component A reacts with polyvinyl alcohol to form a pre-crosslinked body, and preferably, the component A is prepared from the following components in parts by weight: 120-180 parts of EVA emulsion, 12-18 parts of polyvinyl alcohol and 50-100 parts of deionized water, and more preferably 140-160 parts of EVA emulsion, 14-16 parts of polyvinyl alcohol and 50-100 parts of deionized water.
In the invention, the component B is a diluted solution of a titanium acetylacetonate solution, the dilution degree of the diluted solution influences the strength and the curing speed of a product, and preferably, the component B comprises the following components in parts by weight: 2-4 parts of titanium acetylacetonate solution, 150-450 parts of organic solvent, more preferably 2-4 parts of titanium acetylacetonate solution, and 200-400 parts of organic solvent, such as 2-4 parts of titanium acetylacetonate solution, 250 parts of organic solvent, 300 parts of organic solvent or 350 parts of organic solvent. The titanium acetylacetonate solution is a commercial product, wherein the mass content of titanium is 9-15%.
When the environment-friendly bi-component EVA adhesive is used, the mass ratio of the component A to the component B is 100: (1-10), preferably 100: (2-8), more preferably 100: (4-6) to control the curing speed and the strength of the cured gel.
The molecular weight of the polyvinyl alcohol is 7000-10000, and the compatibility of the polyvinyl alcohol with the EVA emulsion is good, so that the strong binding force of the glue is ensured. The molecular weight has an influence on the compatibility, structure and performance of a blending system, so that the compatibility of polyvinyl alcohol with EVA is not deteriorated due to different properties such as different expansion coefficients in the blending process of the polyvinyl alcohol and the EVA.
In the preparation method of the component A, deionized water and polyvinyl alcohol are added into a reaction kettle, the mixture is heated to 70-90 ℃ under the stirring condition, the temperature is kept for 30-40 min to obtain a polyvinyl alcohol solution, then the temperature is reduced to 40-60 ℃, the temperature is kept for 10-15min, and then the EVA emulsion is added. Because the EVA emulsion has high viscosity, the EVA emulsion is difficult to be uniformly mixed in the process of blending with polyvinyl alcohol. According to the invention, a small amount of deionized water is added to form a polyvinyl alcohol aqueous solution, the polyvinyl alcohol aqueous solution is heated to 70-90 ℃, the temperature is kept for 30-40 min, the temperature is reduced to 40-60 ℃, the temperature is kept for 10-15min, the fluidity is improved, and finally the EVA emulsion is added, so that the two can be fully and uniformly mixed.
In the preparation method of the component B, the organic solvent and the titanium acetylacetonate solution are added into a reaction kettle, fully heated to 120-160 ℃, and stirred for 30-60min to uniformly mix, preferably heated to 125-155 ℃, more preferably heated to 130-145 ℃, for example 135 ℃ or 140 ℃ so as to ensure that the titanium acetylacetonate is fully dissolved in the solvent, and the dispersion effect of the titanium acetylacetonate has obvious influence on the curing speed and strength of the colloid.
After the temperature is reduced to room temperature, an ultrasonic instrument is used for ultrasonic treatment for 1-2 hours, the ultrasonic treatment can promote the dispersion of the titanium acetylacetonate solution and remove gas in the liquid, so that the titanium acetylacetonate is dissolved more fully, and the titanium acetylacetonate solution is placed at room temperature for standing and crystallization.
Has the advantages that:
according to the environment-friendly bi-component EVA adhesive, polyvinyl alcohol in a certain proportion is added into EVA emulsion to be mixed, the component A is prepared after heating for a period of time, and the diluted titanium acetylacetonate is matched to obtain the bi-component adhesive, so that the adhesive can be used for bonding a handle and a bag in a high-grade packaging bag, and has enough high drying speed while the environment-friendly performance and the strength are ensured.
The preparation method of the environment-friendly bi-component EVA adhesive has the advantages of short process flow and high production efficiency, improves the strength and curing speed of the adhesive used for high-grade packaging bags, greatly improves the productivity of products, and improves the core competitiveness of the products.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. The examples do not specify particular techniques or conditions, and are performed according to the techniques or conditions described in the literature in the art or according to the product specifications. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available. In the following examples, "%" means weight percent, unless otherwise specified.
The EVA emulsion used in the examples was obtained from Aquyu adhesive products Co.Ltd, Dongguan, under the trade name of H3313FJ, wherein the ethylene-vinyl acetate copolymer had a mass concentration of 94%. The titanium acetylacetonate solution was purchased from LD-801 brand product manufactured by city lida resin limited, nju, in which the titanium mass concentration was 9%. The molecular weight of the polyvinyl alcohol is 7000-8000.
Example 1
A preparation method of an environment-friendly bi-component EVA adhesive comprises the following steps:
the preparation method of the component A comprises the following steps:
s1, adding 20g of deionized water and 2g of polyvinyl alcohol into a reaction kettle, heating to 85 ℃ under the stirring condition, and keeping the temperature for 40 min;
s2, cooling the solution obtained in the step S1 to room temperature, weighing 10g of polyvinyl alcohol solution and 10g of EVA emulsion, heating the mixture in a reaction kettle to 50 ℃, and fully stirring and reacting at the temperature for 1 hour;
and S3, cooling the reaction liquid to room temperature after the reaction is finished, and obtaining the component A.
Preparation method of component B
S1, adding 10g of xylene and 0.1g of titanium acetylacetonate solution into a reaction kettle, fully heating to 140 ℃, and stirring for 40min to fully dissolve the titanium acetylacetonate;
s2, cooling the solution obtained in the step S1 to room temperature, and then performing ultrasonic treatment for 1 hour by using an ultrasonic instrument to obtain a component B.
The using method comprises the following steps: the 10gA component and the 0.5gB component are uniformly stirred and mixed for 5min before use, or the spraying equipment is used for operation.
The main performance indexes are as follows:
shelf life: more than or equal to 3 months
The shear strength test is carried out by using a 10cm by 5cm by 1.6mm aluminum plate, the prepared double-component adhesive is mixed, coated on the aluminum plate, dried for 24 hours and then subjected to the tensile test by using a 5KN universal testing machine, and the main performance indexes are as follows:
coating thickness: 0.5mm
Gluing area: 1.0cm by 5cm
Shear strength: 178N
The drying time test was carried out using 5cm by 5cm white cardboard sheets, the prepared two-component adhesive was mixed and coated on the sheets, which were then dried in an oven at 45 ℃ and the drying time was tested according to the national standard GB/T1728-1979 touch method.
Gluing area: 1.5cm by 5cm
Coating thickness: 0.7cm
Drying time: 30min
Example 2
A two-component adhesive was prepared according to the procedure of example 1, except that the heating temperature of S2 in the preparation of the A component was changed to 55 ℃ and the main performance indexes thereof were as follows:
shelf life: more than or equal to 3 months
The shear strength test is carried out by using a 10cm by 5cm by 1.6mm aluminum plate, the prepared double-component adhesive is mixed and then coated on the aluminum plate, the mixture is naturally dried for 24 hours, and then a 5KN universal testing machine is used for carrying out the tensile test, wherein the main performance indexes are as follows:
coating thickness: 0.5mm
Gluing area: 1.0cm by 5cm
Shear strength: 189N
The drying time test was carried out using 5cm by 5cm white cardboard sheets, the prepared two-component adhesive was mixed and coated on the sheets, which were then dried in an oven at 45 ℃ and the drying time was tested according to the national standard GB/T1728-1979 touch method.
Gluing area: 1.5cm by 5cm
Coating thickness: 0.7cm
Drying time: 28min
Example 3
A two-component adhesive was prepared as in example 1, except that 12g of the polyvinyl alcohol solution was added in the preparation of component A in S2, and the main performance criteria were as follows:
shelf life: more than or equal to 3 months
The shear strength test is carried out by using a 10cm by 5cm by 1.6mm aluminum plate, the prepared double-component adhesive is mixed and then coated on the aluminum plate, the mixture is naturally dried for 24 hours, and then a 5KN universal testing machine is used for carrying out the tensile test, wherein the main performance indexes are as follows:
coating thickness: 0.5mm
Gluing area: 1.0cm by 5cm
Shear strength: 206N
The drying time test was carried out using 5cm by 5cm white cardboard sheets, the prepared two-component adhesive was mixed and coated on the sheets, which were then dried in an oven at 45 ℃ and the drying time was tested according to the national standard GB/T1728-1979 touch method.
Gluing area: 1.5cm by 5cm
Coating thickness: 0.7cm
Drying time: 20min
Example 4
A two-component adhesive was prepared as in example 1, except that the amount of polyvinyl alcohol added in the preparation of component A, S1, was changed to 3g, and the main performance criteria were as follows:
shelf life: more than or equal to 3 months
The shear strength test is carried out by using a 10cm by 5cm by 1.6mm aluminum plate, the prepared double-component adhesive is mixed and then coated on the aluminum plate, the mixture is naturally dried for 24 hours, and then a 5KN universal testing machine is used for carrying out the tensile test, wherein the main performance indexes are as follows:
coating thickness: 0.5mm
Gluing area: 1.0cm by 5cm
Shear strength: 198N
The drying time test was carried out using 5cm by 5cm white cardboard sheets, the prepared two-component adhesive was mixed and coated on the sheets, which were then dried in an oven at 45 ℃ and the drying time was tested according to the national standard GB/T1728-1979 touch method.
Gluing area: 1.5cm by 5cm
Coating thickness: 0.7cm
Drying time: 24min
Example 5
A two-component adhesive was prepared as in example 1, except that the amount of titanium acetylacetonate solution added in the preparation of component B, S1, was changed to 0.2g, and the main performance criteria were as follows:
shelf life: more than or equal to 3 months
The shear strength test is carried out by using a 10cm by 5cm by 1.6mm aluminum plate, the prepared double-component adhesive is mixed and then coated on the aluminum plate, the mixture is naturally dried for 24 hours, and then a 5KN universal testing machine is used for carrying out the tensile test, wherein the main performance indexes are as follows:
coating thickness: 0.5mm
Gluing area: 1.0cm by 5cm
Shear strength: 229N
The drying time test was carried out using 5cm by 5cm white cardboard sheets, the prepared two-component adhesive was mixed and coated on the sheets, which were then dried in an oven at 45 ℃ and the drying time was tested according to the national standard GB/T1728-1979 touch method.
Gluing area: 1.5cm by 5cm
Coating thickness: 0.7cm
Drying time: 22min
Example 6
A two-component adhesive was prepared according to the method of example 1, except that the heating temperature in the preparation method S1 of the component A was changed to 60 ℃ and the addition amount of the polyvinyl alcohol solution in the preparation method S2 of the component A was changed to 15g, and the main performance indexes thereof were as follows:
shelf life: more than or equal to 3 months
The shear strength test is carried out by using a 10cm by 5cm by 1.6mm aluminum plate, the prepared double-component adhesive is mixed and then coated on the aluminum plate, the mixture is naturally dried for 24 hours, and then a 5KN universal testing machine is used for carrying out the tensile test, wherein the main performance indexes are as follows:
coating thickness: 0.5mm
Gluing area: 1.0cm by 5cm
Shear strength: 245N
The drying time test was carried out using 5cm by 5cm white cardboard sheets, the prepared two-component adhesive was mixed and coated on the sheets, which were then dried in an oven at 45 ℃ and the drying time was tested according to the national standard GB/T1728-1979 touch method.
Gluing area: 1.5cm by 5cm
Coating thickness: 0.7cm
Drying time: 15min
Comparative example 1
A two-part adhesive was prepared according to the method of example 1, comparative part a was prepared as follows:
s1, adding 100g of deionized water and 10g of polyvinyl alcohol into a reaction kettle, heating to 85 ℃ under the stirring condition, and keeping the temperature for 40 min;
s2, cooling the solution obtained in the step S1 to room temperature, weighing 100g of polyvinyl alcohol solution and 10g of EVA in the solution, heating the solution and 10g of EVA in a reaction kettle to 50 ℃, and fully stirring and reacting for 1 hour at the temperature;
and S3, cooling the reaction liquid to room temperature after the reaction is finished to obtain a comparison component A, wherein the viscosity of the comparison component A is reduced in the standing process, which indicates that the mixing is not uniform and the solution property is unstable.
Comparative example 2
A two-part adhesive was prepared according to the method of example 1, wherein the a-part was prepared according to example 1 and the comparative B-part was prepared as follows:
s1, mixing 10g of dimethylbenzene and 0.1g of titanium acetylacetonate solution, and stirring for 40min at normal temperature to obtain a diluent;
s2, the diluent obtained in the step S1 is subjected to ultrasonic treatment for 1 hour by using an ultrasonic instrument to obtain a comparative component B.
The prepared component B is crystallized after standing for 10 hours.
The comparative B component was used in admixture with the A component of example 1, with reference to the methods of use in the examples.
The shear strength test is carried out by using a 10cm by 5cm by 1.6mm aluminum plate, the prepared double-component adhesive is mixed, coated on the aluminum plate, dried for 24 hours and then subjected to the tensile test by using a 5KN universal testing machine, and the main performance indexes are as follows:
coating thickness: 0.5mm
Gluing area: 1.0cm by 5cm
Shear strength: 124N
The drying time test was carried out using 5cm by 5cm white cardboard sheets, the prepared two-component adhesive was mixed and coated on the sheets, which were then dried in an oven at 45 ℃ and the drying time was tested according to the national standard GB/T1728-1979 touch method.
Gluing area: 1.5cm by 5cm
Coating thickness: 0.7cm
Drying time: 135min
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. The environment-friendly bi-component EVA adhesive comprises a component A and a component B, and is characterized in that: the component A is prepared from the following components in parts by weight: 100-200 parts of EVA emulsion, 10-20 parts of polyvinyl alcohol and 50-100 parts of deionized water;
the component B comprises the following components in parts by weight: 1-5 parts of titanium acetylacetonate solution and 100-500 parts of organic solvent;
the mass ratio of the component A to the component B is 100: (1-10).
2. The environmentally friendly two-component EVA adhesive of claim 1, wherein: the component A is prepared from the following components in parts by weight: 120-180 parts of EVA emulsion, 12-18 parts of polyvinyl alcohol and 50-100 parts of deionized water.
3. The environmentally friendly two-component EVA adhesive of claim 1, wherein: the component B comprises the following components in parts by weight: 2-4 parts of titanium acetylacetonate solution and 150-450 parts of organic solvent.
4. The environmentally friendly two-component EVA adhesive of claim 1, wherein: the mass ratio of the component A to the component B is 100: (2-8).
5. The environmentally friendly two-component EVA adhesive of any one of claims 1-4, wherein: the EVA emulsion is a solution containing an ethylene-vinyl acetate copolymer, and the mass proportion of vinyl acetate in the ethylene-vinyl acetate copolymer is 20-45%;
optionally, the molecular weight of the polyvinyl alcohol is 7000-10000.
6. The environmentally friendly two-component EVA adhesive of any one of claims 1-4, wherein: the titanium acetylacetonate solution is prepared by dispersing titanium acetylacetonate in an isopropanol aqueous solution, wherein the volume fraction of the isopropanol aqueous solution is 20-30%, and the mass content of titanium in the titanium acetylacetonate solution is 9-15%;
optionally, the organic solvent is at least one of xylene, isopropanol or ethyl acetate.
7. A method for preparing the environment-friendly two-component EVA adhesive of any one of claims 1-6, which is characterized in that: the preparation method comprises the following steps:
SA1, weighing the raw materials according to the weight parts, adding deionized water and polyvinyl alcohol into a reaction kettle, heating to 70-90 ℃ under the stirring condition, and preserving heat for 30-40 min;
SA2, cooling the solution obtained in the step S1 to 40-60 ℃, preserving heat for 10-15min, adding EVA emulsion, and fully stirring and reacting at the temperature of 40-60 ℃ for 1-2 h;
SA3, cooling the reaction solution to room temperature after the reaction is finished to obtain the component A;
and/or a preparation method of the component B, which comprises the following steps:
SB1, weighing the raw materials according to the weight parts, adding the organic solvent and the titanium acetylacetonate solution into a reaction kettle, fully heating to 160 ℃, and stirring for 30-60min to uniformly mix;
SB2, and cooling the solution obtained in the step S1 to room temperature, and then carrying out ultrasonic treatment for 1-2 hours by using an ultrasonic instrument to obtain the component B.
8. The preparation method of the environment-friendly bi-component EVA adhesive according to claim 7, wherein: the EVA emulsion is a solution containing an ethylene-vinyl acetate copolymer, and the mass proportion of vinyl acetate in the ethylene-vinyl acetate copolymer is 20-45%;
optionally, the molecular weight of the polyvinyl alcohol is 7000-10000;
optionally, the titanium acetylacetonate solution is prepared by dispersing titanium acetylacetonate in an isopropanol aqueous solution, wherein the volume fraction of the isopropanol aqueous solution is 20-30%, and the mass content of titanium in the titanium acetylacetonate solution is 9-15%;
optionally, the organic solvent is at least one of xylene, isopropanol or ethyl acetate.
9. Use of the environmentally friendly two-component EVA adhesive of any of claims 1-6 in the packaging field, characterized in that: after the component A and the component B are mixed, the mixture is quickly cured within 10-60 min at the temperature of 40-50 ℃, or is naturally cured by standing at the temperature of 25-30 ℃.
10. Packaging article bonded by the environmentally friendly two-component EVA adhesive of any one of claims 1-6 or by the process of claim 7 or 8.
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2021
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|---|---|---|---|---|
| US3540962A (en) * | 1964-10-03 | 1970-11-17 | Kuraray Co | Method of extruding polyethylene onto an ethylene-hydrolyzed vinyl acetate copolymer |
| CN1294599A (en) * | 1999-02-18 | 2001-05-09 | 科尼希株式会社 | Process for producing vinyl acetate resin emulsion and water-based adhesive |
| CN101899275A (en) * | 2010-07-15 | 2010-12-01 | 华东理工大学 | Hot-melt adhesive for adhering with epoxy resin and preparation method thereof |
| CN103443232A (en) * | 2011-03-18 | 2013-12-11 | 国际人造丝公司 | Adhesive composition and use thereof |
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