A high-adhesion-strength adhesive and its preparation method

Abstract

The present invention relates to the field of adhesive technology, and more particularly to a kind of adhesive of high adhesion strength and preparation method thereof.The adhesive of above-mentioned high adhesion strength, its raw materials include by mass parts:26 52 parts of porous polyvinyl chloride, 1 2 parts of diethanolamine, 1 2 parts of ethyl acrylate, 1 5 parts of maleic anhydride modified petroleum resin, 5 10 parts of rosin glycerol ester, 1 4 parts of trimethylolpropane acrylate, 1 2 parts of blocked isocyanate cross-linking agent, 1 3 parts of plasticizer, 1 2 parts of antioxidant, 1 2 parts of defoamer, 1 2 parts of leveling agent, 1 2 parts of wetting agent, 1 2 parts of antibacterial agent, and 1 5 parts of 2 4mol / L dopamine hydrochloride solution.The present invention can form a stronger force between substrate, not only the film tensile property is excellent, while the film structure is more dense, can effectively resist the destruction of acidic environment to film, excellent corrosion resistance, comprehensively improves adhesive performance.

Description

Technical Field

[0001] This invention relates to the field of adhesive technology, and more particularly to an adhesive with high adhesion strength and its preparation method. Background Technology

[0002] Adhesion refers to the technique of joining the surfaces of objects together using adhesives. It is particularly suitable for joining components of different materials, thicknesses, ultra-thin dimensions, and complex structures. Currently, with the in-depth progress in research on adhesives, their performance, variety, and applications have seen rapid development.

[0003] Polyvinyl chloride (PVC) materials possess excellent storage stability and aging resistance. They are widely available and easy to process, and are currently widely used in various plastic packaging materials. PVC products also exhibit excellent corrosion resistance and a certain degree of mechanical strength, finding extensive applications not only in daily consumer goods but also in adhesives.

[0004] Currently, polyvinyl chloride (PVC) adhesives exhibit good bonding performance to a variety of materials, characterized by good wettability, high initial bond strength, non-toxicity, and non-polluting properties. However, they are prone to losing their adhesive properties under acidic conditions. Furthermore, PVC-based adhesives contain a large amount of small-molecule plasticizers, which can migrate to the interface between the substrate and the adhesive layer or into the adhesive layer itself, easily leading to a severe decline in bonding performance. Peel strength and holding power are significantly reduced, a problem that urgently needs to be addressed. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing an adhesive with high adhesion strength and its preparation method.

[0006] An adhesive with high adhesion strength comprises the following raw materials by weight: 26-52 parts porous polyvinyl chloride, 1-2 parts diethanolamine, 1-2 parts ethyl acrylate, 1-5 parts maleic anhydride modified petroleum resin, 5-10 parts rosin glycerol ester, 1-4 parts trimethylolpropane acrylate, 1-2 parts blocked isocyanate crosslinking agent, 1-3 parts plasticizer, 1-2 parts antioxidant, 1-2 parts defoamer, 1-2 parts leveling agent, 1-2 parts wetting agent, 1-2 parts antibacterial agent, and 1-5 parts dopamine hydrochloride solution with a concentration of 2-4 mol / L.

[0007] Preferably, the plasticizer is at least one selected from dioctyl phthalate, dibutyl phthalate, dimethyl phthalate, and diethyl phthalate.

[0008] Preferably, the antioxidant is antioxidant 1010.

[0009] Preferably, the defoamer is polyoxypropylene glycerol ether.

[0010] Preferably, the leveling agent is polydimethylsiloxane.

[0011] Preferably, the wetting agent is polyoxyethylene fatty alcohol ether.

[0012] Preferably, the antibacterial agent is at least one of dialcyldimethylammonium chloride, dialcyldimethylammonium bromide, dioctyldimethylammonium chloride, and dioctyldimethylammonium bromide.

[0013] Preferably, porous polyvinyl chloride is prepared by the following steps: polyvinyl chloride, calcium carbonate, and epoxidized soybean oil are mixed, stirred at 160-170℃ for 2-4 minutes, extruded and granulated at 180-190℃, crushed and sieved, fed into hydrochloric acid, ultrasonically treated at 60-70℃ for 10-30 minutes, washed, and vacuum dried to obtain porous polyvinyl chloride.

[0014] More preferably, the mass ratio of polyvinyl chloride, calcium carbonate, and epoxidized soybean oil is 20-40:5-10:1-2.

[0015] The above-mentioned method for preparing adhesives with high adhesion strength includes the following steps:

[0016] S1. Add porous polyvinyl chloride to an ethanol aqueous solution, add diethanolamine and stir for 10-20 min, add hydrochloric acid dopamine solution dropwise while stirring, and continue stirring for 10-30 min after the addition is complete, add ethyl acrylate and continue stirring for 1-2 h, add water, filter, wash, and vacuum dry to obtain pretreated polyvinyl chloride.

[0017] S2. Add pretreated polyvinyl chloride, maleic anhydride modified petroleum resin, rosin glycerol ester, trimethylolpropane acrylate, blocked isocyanate crosslinking agent, and plasticizer to the solvent, stir at 70-85℃ for 30-60 minutes, then add antioxidant, defoamer, leveling agent, wetting agent, and antibacterial agent and stir for 10-20 minutes. Cool to 30-40℃ and filter.

[0018] Beneficial effects:

[0019] This invention uses polyvinyl chloride (PVC) compounded with calcium carbonate and epoxidized soybean oil. Calcium carbonate is uniformly dispersed in PVC to form a two-phase structure. Hydrochloric acid treatment promotes the decomposition of calcium carbonate, and after washing, a porous structure is formed. Polydopamine is then combined on this porous structure, and ethyl acrylate is adsorbed through hydrogen bonding and π-π stacking. The resulting pretreated PVC has high stability. The pretreated PVC is then combined with trimethylolpropane acrylate and bonded under the action of a blocked isocyanate crosslinking agent to form a three-dimensional network structure with high initial tack, excellent peel strength, and good adhesion performance.

[0020] This invention utilizes pretreated polyvinyl chloride in combination with plasticizers. The small molecule plasticizers are less likely to migrate to the interface between the substrate and the adhesive layer or into the adhesive layer, effectively reducing the phenomenon of decreased adhesion performance and resulting in excellent holding power.

[0021] This invention utilizes pretreated polyvinyl chloride and trimethylolpropane acrylate for cross-linking, which has good compatibility with maleic anhydride modified petroleum resin and rosin glycerol ester. The resulting multi-network structure can form a stronger interaction force with the substrate, resulting in not only excellent tensile properties of the adhesive film, but also a denser adhesive film structure that can effectively resist damage to the adhesive film from acidic environments, excellent corrosion resistance, and overall improved adhesive performance. Attached Figure Description

[0022] Figure 1 The images show a comparison of the initial tack and initial tack after 30 days of constant temperature and humidity storage of the adhesives obtained in Example 5 and Comparative Examples 1-2.

[0023] Figure 2 The chart shows the tackiness of the adhesives obtained in Example 5 and Comparative Examples 1-2, and the comparison of tackiness after being placed at constant temperature and humidity for 30 days.

[0024] Figure 3 The image shows a comparison of the 180° peel strength of the adhesives obtained in Example 5 and Comparative Examples 1-2, and the 180° peel strength after being placed at constant temperature and humidity for 30 days.

[0025] Figure 4 The image shows a comparison of the tensile strength of the adhesives obtained in Example 5 and Comparative Examples 1-2, and the tensile strength after soaking in hydrochloric acid for 7 days. Detailed Implementation

[0026] The present invention will be further explained below with reference to specific embodiments.

[0027] Example 1

[0028] A high-adhesion-strength adhesive, comprising the following raw materials: 26g porous polyvinyl chloride, 1g diethanolamine, 1g ethyl acrylate, 1g maleic anhydride modified petroleum resin, 5g rosin glycerol ester, 1g trimethylolpropane acrylate, 1g blocked isocyanate crosslinking agent, 1g dioctyl phthalate, 1g antioxidant 1010, 1g polyoxypropylene glycerol ether, 1g polydimethylsiloxane, 1g polyoxyethylene fatty alcohol ether, 1g dialcyl dimethyl ammonium chloride, and 1g dopamine hydrochloride solution with a concentration of 2mol / L.

[0029] Porous polyvinyl chloride is prepared by the following steps: 20g of polyvinyl chloride, 5g of calcium carbonate and 1g of epoxidized soybean oil are mixed and stirred at 160℃ for 2min. The mixture is then fed into an extruder and extruded and granulated at 180℃. The granules are then crushed and passed through a 100-mesh sieve and fed into 100g of 1% hydrochloric acid. The mixture is then ultrasonically treated at 60℃ for 10min, washed sequentially with deionized water and ethanol, and then vacuum dried.

[0030] The above-mentioned method for preparing adhesives with high adhesion strength includes the following steps:

[0031] S1. Porous polyvinyl chloride was added to 50g of 40% ethanol aqueous solution, diethanolamine was added and stirred for 10min, and dopamine hydrochloride solution was added dropwise while stirring. After the addition was complete, stirring was continued for 10min at a stirring speed of 1000r / min. Ethyl acrylate was added and stirring was continued for 1h. 200g of water was added, filtered, washed, and vacuum dried to obtain pretreated polyvinyl chloride.

[0032] S2. Add pretreated polyvinyl chloride, maleic anhydride modified petroleum resin, rosin glycerol ester, trimethylolpropane acrylate, blocked isocyanate crosslinking agent, and dioctyl phthalate to 20g of ethyl acetate and stir at 70℃ for 30min. Then add antioxidant 1010, polyoxypropylene glycerol ether, polydimethylsiloxane, polyoxyethylene fatty alcohol ether, and didecyl dimethyl ammonium chloride and stir for 10min. Cool to 30℃ and filter.

[0033] Example 2

[0034] A high-adhesion-strength adhesive comprises the following raw materials: 52g porous polyvinyl chloride, 2g diethanolamine, 2g ethyl acrylate, 5g maleic anhydride modified petroleum resin, 10g rosin glycerol ester, 4g trimethylolpropane acrylate, 2g blocked isocyanate crosslinking agent, 3g dibutyl phthalate, 2g antioxidant 1010, 2g polyoxypropylene glycerol ether, 2g polydimethylsiloxane, 2g polyoxyethylene fatty alcohol ether, 2g dioctyl dimethyl ammonium chloride, and 5g dopamine hydrochloride solution with a concentration of 4mol / L.

[0035] Porous polyvinyl chloride is prepared by the following steps: 40g of polyvinyl chloride, 10g of calcium carbonate and 2g of epoxidized soybean oil are mixed and stirred at 170℃ for 4min. The mixture is then fed into an extruder and extruded and granulated at 190℃. The granules are then crushed and passed through a 100-mesh sieve and fed into 200g of 4% hydrochloric acid. The mixture is then ultrasonically treated at 70℃ for 30min, washed sequentially with deionized water and ethanol, and then vacuum dried.

[0036] The above-mentioned method for preparing adhesives with high adhesion strength includes the following steps:

[0037] S1. Porous polyvinyl chloride was added to 100g of 60% ethanol aqueous solution, diethanolamine was added and stirred for 20min, and dopamine hydrochloride solution was added dropwise while stirring. After the addition was complete, stirring was continued for 30min at a stirring speed of 2000r / min. Ethyl acrylate was added and stirring was continued for 2h. 400g of water was added, filtered, washed, and vacuum dried to obtain pretreated polyvinyl chloride.

[0038] S2. Add pretreated polyvinyl chloride, maleic anhydride modified petroleum resin, rosin glycerol ester, trimethylolpropane acrylate, blocked isocyanate crosslinking agent, and dibutyl phthalate to 40g of ethyl acetate and stir at 85℃ for 60min. Then add antioxidant 1010, polyoxypropylene glycerol ether, polydimethylsiloxane, polyoxyethylene fatty alcohol ether, and dioctyldimethylammonium chloride and stir for 20min. Cool to 40℃ and filter.

[0039] Example 3

[0040] A high-adhesion-strength adhesive comprises the following raw materials: 32.5g porous polyvinyl chloride, 1.8g diethanolamine, 1.3g ethyl acrylate, 4g maleic anhydride modified petroleum resin, 7g rosin glycerol ester, 3g trimethylolpropane acrylate, 1.3g blocked isocyanate crosslinking agent, 2.5g diethyl phthalate, 1.3g antioxidant 1010, 1.8g polyoxypropylene glycerol ether, 1.3g polydimethylsiloxane, 1.8g polyoxyethylene fatty alcohol ether, 1.3g dioctyl dimethyl ammonium chloride, and 2g of 3.5mol / L dopamine hydrochloride solution.

[0041] Porous polyvinyl chloride is prepared by the following steps: 35g of polyvinyl chloride, 7g of calcium carbonate, and 1.7g of epoxidized soybean oil are mixed and stirred at 162℃ for 3.5min. The mixture is then fed into an extruder and extruded and granulated at 182℃. The granules are then crushed and passed through a 100-mesh sieve. The mixture is then fed into 180g of 2% hydrochloric acid and ultrasonically treated at 68℃ for 15min. The mixture is then washed sequentially with deionized water and ethanol, and finally vacuum dried.

[0042] The above-mentioned method for preparing adhesives with high adhesion strength includes the following steps:

[0043] S1. Porous polyvinyl chloride was added to 90g of 45% ethanol aqueous solution, diethanolamine was added and stirred for 18min, and dopamine hydrochloride solution was added dropwise while stirring. After the addition was complete, stirring was continued for 15min at a stirring speed of 1800r / min. Ethyl acrylate was added and stirring was continued for 80min. 350g of water was added, filtered, washed, and vacuum dried to obtain pretreated polyvinyl chloride.

[0044] S2. Add pretreated polyvinyl chloride, maleic anhydride modified petroleum resin, rosin glycerol ester, trimethylolpropane acrylate, blocked isocyanate crosslinking agent, and diethyl phthalate to 25g of ethyl acetate and stir at 80℃ for 40min. Then add antioxidant 1010, polyoxypropylene glycerol ether, polydimethylsiloxane, polyoxyethylene fatty alcohol ether, and dioctyldimethylammonium chloride and stir for 18min. Cool to 33℃ and filter.

[0045] Example 4

[0046] A high-adhesion-strength adhesive comprises the following raw materials: 45.5g porous polyvinyl chloride, 1.2g diethanolamine, 1.7g ethyl acrylate, 2g maleic anhydride modified petroleum resin, 9g rosin glycerol ester, 2g trimethylolpropane acrylate, 1.7g blocked isocyanate crosslinking agent, 1.5g diethyl phthalate, 1.7g antioxidant 1010, 1.2g polyoxypropylene glycerol ether, 1.7g polydimethylsiloxane, 1.2g polyoxyethylene fatty alcohol ether, 1.7g dioctyl dimethyl ammonium bromide, and 4g of 2.5mol / L dopamine hydrochloride solution.

[0047] Porous polyvinyl chloride is prepared by the following steps: 25g of polyvinyl chloride, 9g of calcium carbonate, and 1.3g of epoxidized soybean oil are mixed and stirred at 168℃ for 2.5min. The mixture is then fed into an extruder and extruded and granulated at 188℃. The granules are then crushed and passed through a 100-mesh sieve. The mixture is then fed into 120g of 3% hydrochloric acid and ultrasonically treated at 62℃ for 25min. The mixture is then washed sequentially with deionized water and ethanol, and finally vacuum dried.

[0048] The above-mentioned method for preparing adhesives with high adhesion strength includes the following steps:

[0049] S1. Porous polyvinyl chloride was added to 70g of 55% ethanol aqueous solution, diethanolamine was added and stirred for 12min, and dopamine hydrochloride solution was added dropwise while stirring. After the addition was complete, stirring was continued for 25min at a stirring speed of 1200r / min. Ethyl acrylate was added and stirring was continued for 100min. 250g of water was added, filtered, washed, and vacuum dried to obtain pretreated polyvinyl chloride.

[0050] S2. Add pretreated polyvinyl chloride, maleic anhydride modified petroleum resin, rosin glycerol ester, trimethylolpropane acrylate, blocked isocyanate crosslinking agent, and diethyl phthalate to 35g of ethyl acetate and stir at 75℃ for 50min; then add antioxidant 1010, polyoxypropylene glycerol ether, polydimethylsiloxane, polyoxyethylene fatty alcohol ether, and dioctyldimethylammonium bromide and stir for 12min, cool to 37℃, and filter.

[0051] Example 5

[0052] A high-adhesion-strength adhesive comprises the following raw materials: 39g porous polyvinyl chloride, 1.5g diethanolamine, 1.5g ethyl acrylate, 3g maleic anhydride modified petroleum resin, 8g rosin glycerol ester, 2.5g trimethylolpropane acrylate, 1.5g blocked isocyanate crosslinking agent, 2g diethyl phthalate, 1.5g antioxidant 1010, 1.5g polyoxypropylene glycerol ether, 1.5g polydimethylsiloxane, 1.5g polyoxyethylene fatty alcohol ether, 1.5g dioctyl dimethyl ammonium bromide, and 3g of 3mol / L dopamine hydrochloride solution.

[0053] Porous polyvinyl chloride is prepared by the following steps: 30g of polyvinyl chloride, 7.5g of calcium carbonate, and 1.5g of epoxidized soybean oil are mixed and stirred at 165℃ for 3 minutes. The mixture is then fed into an extruder and extruded and granulated at 185℃. The granules are then crushed and passed through a 100-mesh sieve. The mixture is then fed into 150g of 2.5% hydrochloric acid and ultrasonically treated at 65℃ for 20 minutes. The mixture is then washed sequentially with deionized water and ethanol, and finally vacuum dried.

[0054] The above-mentioned method for preparing adhesives with high adhesion strength includes the following steps:

[0055] S1. Add porous polyvinyl chloride to 80g of 50% ethanol aqueous solution, add diethanolamine and stir for 15min, add dopamine hydrochloride solution dropwise while stirring, and continue stirring for 20min after the addition is complete at a stirring speed of 1500r / min, add ethyl acrylate and continue stirring for 90min, add 300g of water, filter, wash, and vacuum dry to obtain pretreated polyvinyl chloride;

[0056] S2. Add pretreated polyvinyl chloride, maleic anhydride modified petroleum resin, rosin glycerol ester, trimethylolpropane acrylate, blocked isocyanate crosslinking agent, and diethyl phthalate to 30g of ethyl acetate and stir at 78℃ for 45min. Then add antioxidant 1010, polyoxypropylene glycerol ether, polydimethylsiloxane, polyoxyethylene fatty alcohol ether, and dioctyldimethylammonium bromide and stir for 15min. Cool to 35℃ and filter.

[0057] Comparative Example 1

[0058] A high-adhesion-strength adhesive comprises the following raw materials: 39g polyvinyl chloride, 1.5g diethanolamine, 1.5g ethyl acrylate, 3g maleic anhydride-modified petroleum resin, 8g rosin glycerol ester, 2.5g trimethylolpropane acrylate, 1.5g blocked isocyanate crosslinking agent, 2g diethyl phthalate, 1.5g antioxidant 1010, 1.5g polyoxypropylene glycerol ether, 1.5g polydimethylsiloxane, 1.5g polyoxyethylene fatty alcohol ether, 1.5g dioctyl dimethyl ammonium bromide, and 3g dopamine hydrochloride solution with a concentration of 3mol / L.

[0059] The above-mentioned method for preparing adhesives with high adhesion strength includes the following steps:

[0060] S1. Add polyvinyl chloride to 80g of 50% ethanol aqueous solution, add diethanolamine and stir for 15min, add dopamine hydrochloride solution dropwise while stirring, and continue stirring for 20min after the addition is complete at a stirring speed of 1500r / min, add ethyl acrylate and continue stirring for 90min, add 300g of water, filter, wash, and vacuum dry to obtain pretreated polyvinyl chloride;

[0061] S2. Add pretreated polyvinyl chloride, maleic anhydride modified petroleum resin, rosin glycerol ester, trimethylolpropane acrylate, blocked isocyanate crosslinking agent, and diethyl phthalate to 30g of ethyl acetate and stir at 78℃ for 45min. Then add antioxidant 1010, polyoxypropylene glycerol ether, polydimethylsiloxane, polyoxyethylene fatty alcohol ether, and dioctyldimethylammonium bromide and stir for 15min. Cool to 35℃ and filter.

[0062] Comparative Example 2

[0063] A high-adhesion-strength adhesive, comprising the following raw materials: 39g porous polyvinyl chloride, 1.5g ethyl acrylate, 3g maleic anhydride modified petroleum resin, 8g rosin glycerol ester, 2.5g trimethylolpropane acrylate, 1.5g blocked isocyanate crosslinking agent, 2g diethyl phthalate, 1.5g antioxidant 1010, 1.5g polyoxypropylene glycerol ether, 1.5g polydimethylsiloxane, 1.5g polyoxyethylene fatty alcohol ether, and 1.5g dioctyl dimethyl ammonium bromide.

[0064] Porous polyvinyl chloride is prepared by the following steps: 30g of polyvinyl chloride, 7.5g of calcium carbonate, and 1.5g of epoxidized soybean oil are mixed and stirred at 165℃ for 3 minutes. The mixture is then fed into an extruder and extruded and granulated at 185℃. The granules are then crushed and passed through a 100-mesh sieve. The mixture is then fed into 150g of 2.5% hydrochloric acid and ultrasonically treated at 65℃ for 20 minutes. The mixture is then washed sequentially with deionized water and ethanol, and finally vacuum dried.

[0065] The above-mentioned method for preparing adhesives with high adhesion strength includes the following steps:

[0066] S1. Add porous polyvinyl chloride to 80g of 50% ethanol aqueous solution, add ethyl acrylate and continue stirring for 90min, add 300g of water, filter, wash, and vacuum dry to obtain pretreated polyvinyl chloride.

[0067] S2. Add pretreated polyvinyl chloride, maleic anhydride modified petroleum resin, rosin glycerol ester, trimethylolpropane acrylate, blocked isocyanate crosslinking agent, and diethyl phthalate to 30g of ethyl acetate and stir at 78℃ for 45min. Then add antioxidant 1010, polyoxypropylene glycerol ether, polydimethylsiloxane, polyoxyethylene fatty alcohol ether, and dioctyldimethylammonium bromide and stir for 15min. Cool to 35℃ and filter.

[0068] The initial tack of the adhesives obtained in Example 5 and Comparative Examples 1-2 was tested according to GB / T 4852-2002 "Test Method for Initial Tack of Pressure-Sensitive Adhesive Tapes (Rolling Ball Method)". The holding power of the adhesives obtained in Example 5 and Comparative Examples 1-2 was tested according to GB / T 4851-2014 "Test Method for Holding Power of Adhesive Tapes". The 180° peel strength of the adhesives obtained in Example 5 and Comparative Examples 1-2 was tested according to GB / T 2792-2014 "Test Method for Peel Strength of Adhesive Tapes".

[0069] The adhesives obtained in Example 5 and Comparative Examples 1-2 were placed in a constant temperature and humidity chamber at 30°C and 50%RH for 30 days, and the initial tack, holding tack and peel strength were measured again.

[0070] like Figures 1 to 3 As shown, the adhesive obtained in Example 5 had the highest initial tack, holding tack, and peel strength, which were superior to Comparative Example 1 and Comparative Example 2 (P < 0.05). At the same time, after being placed in a constant temperature and humidity environment for 30 days, the adhesive obtained in Example 5 still had the highest initial tack, holding tack, and peel strength, which were superior to Comparative Example 1 and Comparative Example 2 (P < 0.05).

[0071] The adhesives obtained in Example 5 and Comparative Examples 1-2 were poured onto a tetrafluoroethylene plate and allowed to spread naturally into a film. The film was left at room temperature for 12 hours and then dried in a vacuum drying oven at 65°C for 24 hours.

[0072] The tensile strength of the above-mentioned film was tested in accordance with GB / T 1040.3-2006 "Determination of tensile properties of plastics - Part 3: Test conditions for films and sheets" at a tensile rate of 200 mm / min.

[0073] Each group of adhesive films was immersed in 5% hydrochloric acid at 25°C for 7 days, then removed and tested for tensile strength again.

[0074] like Figure 4 As shown, the adhesive obtained in Example 5 has the best tensile strength and acid resistance, which is superior to Comparative Example 1 and Comparative Example 2 (P < 0.05).

[0075] The applicant believes that this invention utilizes a compound of polyvinyl chloride (PVC), calcium carbonate, and epoxidized soybean oil. Calcium carbonate is uniformly dispersed within the PVC, forming a two-phase structure. Hydrochloric acid treatment promotes the decomposition of the calcium carbonate, resulting in a porous structure after washing. Polydopamine is then bound to this porous structure, and ethyl acrylate is adsorbed via hydrogen bonding and π-π stacking. The resulting pretreated PVC exhibits high stability. The pretreated PVC is then combined with trimethylolpropane acrylate and bonded under the action of a blocked isocyanate crosslinking agent, forming a three-dimensional network structure with high initial tack, excellent peel strength, and good adhesion. Furthermore, this invention utilizes the combination of pretreated PVC and plasticizers. Small molecule plasticizers are less likely to migrate to the interface between the substrate and the adhesive layer or into the adhesive layer, effectively reducing the decline in adhesion performance and resulting in excellent holding power. This invention utilizes pretreated polyvinyl chloride and trimethylolpropane acrylate for cross-linking, which has good compatibility with maleic anhydride modified petroleum resin and rosin glycerol ester. The resulting multi-network structure can form a stronger interaction force with the substrate, resulting in excellent tensile properties of the adhesive film. Moreover, the denser the adhesive film structure, the more effectively it can resist the damage of acidic environment to the adhesive film, and has excellent corrosion resistance, thus comprehensively improving the adhesive performance.

[0076] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An adhesive with high adhesion strength, characterized in that, The raw materials, by weight, include: 26-52 parts porous polyvinyl chloride, 1-2 parts diethanolamine, 1-2 parts ethyl acrylate, 1-5 parts maleic anhydride modified petroleum resin, 5-10 parts rosin glycerol ester, 1-4 parts trimethylolpropane acrylate, 1-2 parts blocked isocyanate crosslinking agent, 1-3 parts plasticizer, 1-2 parts antioxidant, 1-2 parts defoamer, 1-2 parts leveling agent, 1-2 parts wetting agent, 1-2 parts antibacterial agent, and 1-5 parts 2-4 mol / L dopamine hydrochloride solution; The preparation of the high-adhesion adhesive includes the following steps: S1. Add porous polyvinyl chloride to an ethanol aqueous solution, add diethanolamine and stir for 10-20 min, add hydrochloric acid dopamine solution dropwise while stirring, and continue stirring for 10-30 min after the addition is complete, add ethyl acrylate and continue stirring for 1-2 h, add water, filter, wash, and vacuum dry to obtain pretreated polyvinyl chloride. S2. Add pretreated polyvinyl chloride, maleic anhydride modified petroleum resin, rosin glycerol ester, trimethylolpropane acrylate, blocked isocyanate crosslinking agent, and plasticizer to the solvent, stir at 70-85℃ for 30-60 minutes, then add antioxidant, defoamer, leveling agent, wetting agent, and antibacterial agent and stir for 10-20 minutes. Cool to 30-40℃ and filter.

2. The high-adhesion-strength adhesive according to claim 1, characterized in that, The plasticizer is at least one of dioctyl phthalate, dibutyl phthalate, dimethyl phthalate, and diethyl phthalate.

3. The high-adhesion-strength adhesive according to claim 1, characterized in that, The antioxidant is antioxidant 1010.

4. The high-adhesion-strength adhesive according to claim 1, characterized in that, The defoamer is polyoxypropylene glycerol ether.

5. The high-adhesion-strength adhesive according to claim 1, characterized in that, The leveling agent is polydimethylsiloxane.

6. The high-adhesion-strength adhesive according to claim 1, characterized in that, The wetting agent is polyoxyethylene fatty alcohol ether.

7. The high-adhesion-strength adhesive according to claim 1, characterized in that, The antibacterial agent is at least one of dialcyldimethylammonium chloride, dialcyldimethylammonium bromide, dioctyldimethylammonium chloride, and dioctyldimethylammonium bromide.

8. The high-adhesion-strength adhesive according to claim 1, characterized in that, Porous polyvinyl chloride is prepared by the following steps: polyvinyl chloride, calcium carbonate, and epoxidized soybean oil are mixed, stirred at 160-170℃ for 2-4 minutes, extruded and granulated at 180-190℃, crushed and sieved, fed into hydrochloric acid, ultrasonically treated at 60-70℃ for 10-30 minutes, washed, and vacuum dried to obtain porous polyvinyl chloride.

9. The high-adhesion-strength adhesive according to claim 8, characterized in that, The mass ratio of polyvinyl chloride, calcium carbonate, and epoxidized soybean oil is 20-40:5-10:1-2.

10. A method for preparing a high-adhesion adhesive as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. Add porous polyvinyl chloride to an ethanol aqueous solution, add diethanolamine and stir for 10-20 min, add hydrochloric acid dopamine solution dropwise while stirring, and continue stirring for 10-30 min after the addition is complete, add ethyl acrylate and continue stirring for 1-2 h, add water, filter, wash, and vacuum dry to obtain pretreated polyvinyl chloride. S2. Add pretreated polyvinyl chloride, maleic anhydride modified petroleum resin, rosin glycerol ester, trimethylolpropane acrylate, blocked isocyanate crosslinking agent, and plasticizer to the solvent, stir at 70-85℃ for 30-60 minutes, then add antioxidant, defoamer, leveling agent, wetting agent, and antibacterial agent and stir for 10-20 minutes. Cool to 30-40℃ and filter.

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