Adhesive with high adhesion strength and preparation method thereof

Abstract

The invention relates to the technical field of adhesives, in particular to a high-adhesion-strength adhesive and a preparation method thereof. The adhesive with high adhesion strength is prepared from the following raw materials in parts by mass: 26 to 52 parts of porous polyvinyl chloride, 1 to 2 parts of diethanol amine, 1 to 2 parts of ethyl acrylate, 1 to 5 parts of maleic anhydride modified petroleum resin, 5 to 10 parts of rosin glyceride, 1 to 4 parts of trimethylolpropane acrylate, 1 to 2 parts of blocked isocyanate cross-linking agent, 1 to 3 parts of plasticizer and 1 to 2 parts of antioxidant. The coating is prepared from the following components in parts by weight: 1-2 parts of an anti-foaming agent, 1-2 parts of a flatting agent, 1-2 parts of a wetting agent, 1-2 parts of an antibacterial agent and 1-5 parts of a dopamine hydrochloride solution with the concentration of 2-4mol / L. Stronger acting force can be formed between the adhesive and a base material, the tensile property of an adhesive film is excellent, meanwhile, the structure of the adhesive film is more compact, the adhesive film can be effectively prevented from being damaged by an acid environment, the corrosion resistance is excellent, and the performance of the adhesive is comprehensively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of adhesives, and in particular to an adhesive with high adhesion strength and a preparation method thereof. Background Art

[0002] Adhesion refers to the technology of connecting the surfaces of objects together with adhesives. Adhesion is particularly suitable for connecting different materials, different thicknesses, ultra-thin specifications and complex components. At present, with the in-depth progress of research on adhesives, the performance, variety and application of adhesives have developed by leaps and bounds.

[0003] Polyvinyl chloride materials have excellent storage stability and aging resistance. They are widely available and easy to process. They are currently widely used in various plastic packaging materials. Polyvinyl chloride products have excellent corrosion resistance and certain mechanical strength. In addition to their application in daily products, they are also widely used in adhesives.

[0004] At present, polyvinyl chloride-based adhesives have good bonding properties for a variety of materials, with good wettability, high initial bonding strength, non-toxicity, and no pollution. However, they are prone to lose bonding properties in acidic conditions. At the same time, polyvinyl chloride-based adhesives contain a large amount of small molecule plasticizers, which will migrate to the interface between the substrate and the adhesive layer or into the adhesive layer, which can easily cause a serious decrease in bonding performance, and significantly reduce peel strength and holding force, which needs to be solved urgently. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose an adhesive with high adhesion strength and a preparation method thereof.

[0006] A high-adhesion-strength adhesive, the raw materials of which include, by mass, 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 crosslinking agent, 1-3 parts of plasticizer, 1-2 parts of antioxidant, 1-2 parts of defoaming agent, 1-2 parts of leveling agent, 1-2 parts of wetting agent, 1-2 parts of antibacterial agent, and 1-5 parts of 2-4 mol / L dopamine hydrochloride solution.

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

[0008] Preferably, the antioxidant is antioxidant 1010.

[0009] Preferably, the defoaming agent is polyoxypropylene glyceryl 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 didecyldimethylammonium chloride, didecyldimethylammonium bromide, dioctyldimethylammonium chloride and dioctyldimethylammonium bromide.

[0013] Preferably, the porous polyvinyl chloride is prepared by the following steps: polyvinyl chloride, calcium carbonate and epoxy soybean oil are mixed, stirred at 160-170°C for 2-4 minutes, extruded and granulated at 180-190°C, crushed and sieved, introduced into hydrochloric acid, ultrasonically treated at 60-70°C for 10-30 minutes, washed, and vacuum dried to obtain the 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 method for preparing the above-mentioned adhesive with high adhesion strength comprises the following steps:

[0016] S1. Add porous polyvinyl chloride to an ethanol aqueous solution, add diethanolamine and stir for 10-20 minutes, add dopamine hydrochloride solution dropwise under stirring, continue stirring for 10-30 minutes after the addition is complete, add ethyl acrylate and continue stirring for 1-2 hours, 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 crosslinker and plasticizer into the solvent, stir at 70-85℃ for 30-60min, then add antioxidant, defoamer, leveling agent, wetting agent and antibacterial agent and stir for 10-20min, cool to 30-40℃ and filter.

[0018] Beneficial effects:

[0019] The invention adopts polyvinyl chloride, calcium carbonate and epoxy soybean oil to compound, wherein the calcium carbonate is uniformly dispersed in the polyvinyl chloride to form a two-phase structure, and the calcium carbonate is decomposed by hydrochloric acid treatment, and a porous structure is formed after washing; polydopamine is then combined with the porous structure, and ethyl acrylate is adsorbed by hydrogen bonding and π-π stacking, and the obtained pretreated polyvinyl chloride has high stability; the pretreated polyvinyl chloride is combined with trimethylolpropane acrylate, and combined under the action of a blocked isocyanate crosslinking agent to form a three-dimensional network structure with high initial adhesion, excellent peeling strength and good bonding performance.

[0020] The present invention uses pretreated polyvinyl chloride and plasticizer to combine, and the small molecule plasticizer is not easy to migrate to the interface between the substrate and the adhesive layer or in the adhesive layer, which effectively reduces the phenomenon of decreased bonding performance and has excellent adhesive strength.

[0021] The present invention utilizes pretreated polyvinyl chloride and trimethylolpropane acrylate to compound and cross-link, and has good compatibility with maleic anhydride modified petroleum resin and rosin glycerol ester. The formed multiple network structure can form a stronger force with the substrate, not only the film has excellent tensile performance, but also the denser the film structure, the more effectively it can resist the damage of the acidic environment to the film, the excellent corrosion resistance, and the comprehensive improvement of the adhesive performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The following is a comparison chart of the initial viscosity of the adhesives obtained in Example 5 and Comparative Examples 1-2 and the initial viscosity after being placed at a constant temperature and humidity for 30 days.

[0023] Figure 2 The following is a comparison chart of the adhesive retention of Example 5 and Comparative Examples 1-2 and the adhesive retention after being placed at a constant temperature and humidity for 30 days.

[0024] Figure 3 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 a constant temperature and humidity for 30 days are compared.

[0025] Figure 4 The tensile strength of the adhesives obtained in Example 5 and Comparative Examples 1-2 and the tensile strength after immersion in hydrochloric acid for 7 days are compared. DETAILED DESCRIPTION

[0026] The present invention will be further explained below in conjunction with specific embodiments.

[0027] Example 1

[0028] A high-adhesion-strength adhesive, whose raw materials include: 26g of porous polyvinyl chloride, 1g of diethanolamine, 1g of ethyl acrylate, 1g of maleic anhydride-modified petroleum resin, 5g of rosin glycerol ester, 1g of trimethylolpropane acrylate, 1g of blocked isocyanate crosslinking agent, 1g of dioctyl phthalate, 1g of antioxidant 10101g, 1g of polyoxypropylene glycerol ether, 1g of polydimethylsiloxane, 1g of polyoxyethylene fatty alcohol ether, 1g of didecyldimethylammonium chloride, and 1g of 2mol / L dopamine hydrochloride solution.

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

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

[0031] S1. Add porous polyvinyl chloride to 50g of 40% ethanol aqueous solution, add diethanolamine and stir for 10min, add dopamine hydrochloride solution dropwise under stirring, continue stirring for 10min after complete addition, the stirring speed is 1000r / min, add ethyl acrylate and continue stirring for 1h, add 200g of water, filter, wash, and vacuum dry to obtain pretreated polyvinyl chloride;

[0032] S2. Add pretreated polyvinyl chloride, maleic anhydride modified petroleum resin, rosin glycerol ester, trimethylolpropane acrylate, blocked isocyanate crosslinker and dioctyl phthalate to 20g ethyl acetate and stir at 70°C for 30min; then add antioxidant 1010, polyoxypropylene glycerol ether, polydimethylsiloxane, polyoxyethylene fatty alcohol ether and didecyldimethylammonium chloride and stir for 10min, cool to 30°C and filter.

[0033] Example 2

[0034] A high-adhesion-strength adhesive, whose raw materials include: 52g of porous polyvinyl chloride, 2g of diethanolamine, 2g of ethyl acrylate, 5g of maleic anhydride-modified petroleum resin, 10g of rosin glycerol ester, 4g of trimethylolpropane acrylate, 2g of blocked isocyanate crosslinking agent, 3g of dibutyl phthalate, 10102g of antioxidant, 2g of polyoxypropylene glycerol ether, 2g of polydimethylsiloxane, 2g of polyoxyethylene fatty alcohol ether, 2g of dioctyldimethylammonium chloride, and 5g of 4mol / L dopamine hydrochloride solution.

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

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

[0037] S1. Add porous polyvinyl chloride to 100 g of 60% ethanol aqueous solution, add diethanolamine and stir for 20 min, add dopamine hydrochloride solution dropwise under stirring, continue stirring for 30 min after complete addition, the stirring speed is 2000 r / min, add ethyl acrylate and continue stirring for 2 h, add 400 g of water, filter, wash, and vacuum dry to obtain pretreated polyvinyl chloride;

[0038] S2. Add pretreated polyvinyl chloride, maleic anhydride modified petroleum resin, rosin glycerol ester, trimethylolpropane acrylate, blocked isocyanate crosslinker and dibutyl phthalate to 40g ethyl acetate and stir at 85°C for 60min; then add antioxidant 1010, polyoxypropylene glycerol ether, polydimethylsiloxane, polyoxyethylene fatty alcohol ether and dioctyl dimethyl ammonium chloride and stir for 20min, cool to 40°C and filter.

[0039] Example 3

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

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

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

[0043] S1. Add porous polyvinyl chloride to 90g of 45% ethanol aqueous solution, add diethanolamine and stir for 18min, add dopamine hydrochloride solution dropwise under stirring, continue stirring for 15min after complete addition, the stirring speed is 1800r / min, add ethyl acrylate and continue stirring for 80min, add 350g of water, filter, wash, and vacuum dry to obtain pretreated polyvinyl chloride;

[0044] S2. Add pretreated polyvinyl chloride, maleic anhydride modified petroleum resin, rosin glycerol ester, trimethylolpropane acrylate, blocked isocyanate crosslinker and diethyl phthalate to 25g ethyl acetate and stir at 80°C for 40min; then add antioxidant 1010, polyoxypropylene glycerol ether, polydimethylsiloxane, polyoxyethylene fatty alcohol ether and dioctyl dimethyl ammonium chloride and stir for 18min, cool to 33°C and filter.

[0045] Example 4

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

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

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

[0049] S1. Add porous polyvinyl chloride to 70g of 55% ethanol aqueous solution, add diethanolamine and stir for 12min, add dopamine hydrochloride solution dropwise under stirring, continue stirring for 25min after complete addition, the stirring speed is 1200r / min, add ethyl acrylate and continue stirring for 100min, add 250g of water, filter, wash, and vacuum dry to obtain pretreated polyvinyl chloride;

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

[0051] Example 5

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

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

[0054] The method for preparing the above-mentioned adhesive with high adhesion strength comprises 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 under stirring, continue stirring for 20min after complete addition, the stirring speed is 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 crosslinker and diethyl phthalate to 30g ethyl acetate and stir at 78°C for 45min; then add antioxidant 1010, polyoxypropylene glycerol ether, polydimethylsiloxane, polyoxyethylene fatty alcohol ether and dioctyl dimethyl ammonium bromide and stir for 15min, cool to 35°C and filter.

[0057] Comparative Example 1

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

[0059] The method for preparing the above-mentioned adhesive with high adhesion strength comprises 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 under stirring, continue stirring for 20min after complete addition, the stirring speed is 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 crosslinker and diethyl phthalate to 30g ethyl acetate and stir at 78°C for 45min; then add antioxidant 1010, polyoxypropylene glycerol ether, polydimethylsiloxane, polyoxyethylene fatty alcohol ether and dioctyl dimethyl ammonium bromide and stir for 15min, cool to 35°C and filter.

[0062] Comparative Example 2

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

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

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

[0066] S1. Add porous polyvinyl chloride to 80 g of 50% ethanol aqueous solution, add ethyl acrylate and continue stirring for 90 min, add 300 g 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 crosslinker and diethyl phthalate to 30g ethyl acetate and stir at 78°C for 45min; then add antioxidant 1010, polyoxypropylene glycerol ether, polydimethylsiloxane, polyoxyethylene fatty alcohol ether and dioctyl dimethyl ammonium bromide and stir for 15min, cool to 35°C and filter.

[0068] The initial tack of the adhesives obtained in Example 5 and Comparative Examples 1-2 was tested with reference to GB / T 4852-2002 "Test method for initial tack of pressure-sensitive adhesive tapes (rolling ball method)". The persistent tack of the adhesives obtained in Example 5 and Comparative Examples 1-2 was tested with reference to GB / T4851-2014 "Test method for persistent tack of adhesive tapes". The 180° peel strength of the adhesives obtained in Example 5 and Comparative Examples 1-2 was tested with reference 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, sustained tack and peel strength were measured again.

[0070] like Figures 1 to 3 As shown, the initial tack, sustained tack and peel strength of the adhesive obtained in Example 5 are the highest, which are better than those in Comparative Examples 1 and 2 (P < 0.05); at the same time, after being placed in a constant temperature and humidity environment for 30 days, the initial tack, sustained tack and peel strength of the adhesive obtained in Example 5 are still the highest, which are better than those in Comparative Examples 1 and 2 (P < 0.05).

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

[0072] The tensile strength of the above-mentioned film was tested with reference to 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 films was immersed in 5% hydrochloric acid at 25°C for 7 days, taken out, and the tensile strength was tested again.

[0074] like Figure 4 As shown, the tensile strength and acid resistance of the adhesive obtained in Example 5 are the best, which are better than those of Comparative Examples 1 and 2 (P < 0.05).

[0075] The applicant believes that this is because the present invention uses polyvinyl chloride, calcium carbonate, and epoxy soybean oil to compound, and calcium carbonate is evenly dispersed in polyvinyl chloride to form a two-phase structure. The calcium carbonate therein is decomposed by hydrochloric acid treatment, and a porous structure is formed after washing; polydopamine is then combined with the porous structure to adsorb ethyl acrylate through hydrogen bonding and π-π stacking, and the resulting pretreated polyvinyl chloride has high stability. The pretreated polyvinyl chloride is combined with trimethylolpropane acrylate and combined under the action of a blocked isocyanate crosslinking agent to form a three-dimensional network structure with high initial adhesion, excellent peel strength, and good bonding performance. At the same time, the present invention uses pretreated polyvinyl chloride and plasticizers to combine, and small molecule plasticizers are not easy to migrate to the interface between the substrate and the adhesive layer or the adhesive layer, which effectively reduces the phenomenon of decreased bonding performance and has excellent sustained adhesion. The present invention utilizes pretreated polyvinyl chloride and trimethylolpropane acrylate to compound and cross-link, and has good compatibility with maleic anhydride modified petroleum resin and rosin glycerol ester. The formed multiple network structure can form a stronger force with the substrate, not only the film has excellent tensile performance, but also the denser the film structure, the more effectively it can resist the damage to the film in the acidic environment, the excellent corrosion resistance, and the comprehensive improvement of the adhesive performance.

[0076] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An adhesive with high bonding strength, characterized in that: The raw materials include, by mass, 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 crosslinking agent, 1-3 parts of plasticizer, 1-2 parts of antioxidant, 1-2 parts of defoaming agent, 1-2 parts of leveling agent, 1-2 parts of wetting agent, 1-2 parts of antibacterial agent and 1-5 parts of 2-4 mol / L dopamine hydrochloride solution.

2. The adhesive with high bonding strength 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 adhesive with high bonding strength according to claim 1, characterized in that: The antioxidant is antioxidant 1010.

4. The adhesive with high bonding strength according to claim 1, characterized in that: The defoaming agent is polyoxypropylene glyceryl ether.

5. The adhesive with high bonding strength according to claim 1, characterized in that: The leveling agent is polydimethylsiloxane.

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

7. The adhesive with high bonding strength according to claim 1, characterized in that: The antibacterial agent is at least one of didecyldimethylammonium chloride, didecyldimethylammonium bromide, dioctyldimethylammonium chloride and dioctyldimethylammonium bromide.

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

9. The adhesive with high bonding strength 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 an adhesive with high adhesion strength as claimed in any one of claims 1 to 9, characterized in that: The steps include: S1. Add porous polyvinyl chloride to an ethanol aqueous solution, add diethanolamine and stir for 10-20 minutes, add dopamine hydrochloride solution dropwise under stirring, continue stirring for 10-30 minutes after the addition is complete, add ethyl acrylate and continue stirring for 1-2 hours, 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 crosslinker and plasticizer into the solvent, stir at 70-85℃ for 30-60min, then add antioxidant, defoamer, leveling agent, wetting agent and antibacterial agent and stir for 10-20min, cool to 30-40℃ and filter.

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