Tear-resistant plastic vest bag and preparation method thereof

Abstract

The invention relates to a tear-resistant plastic vest bag and a preparation method thereof, and belongs to the technical field of high polymer materials. The tear-resistant plastic vest bag comprises the following components in parts by weight: 50-80 parts of PP resin, 0.4-0.6 part of polylactic acid, 1-5 parts of an antistatic modifier, 1-5 parts of a modified anti-aging agent, 3-7 parts of an antioxidant, 1-5 parts of a plasticizer and 1-3 parts of a lubricant, the tear-resistant plastic vest bag prepared by the invention not only has good antistatic and tensile strength effects, but also has excellent heat-resistant and aging-resistant effects.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high polymer materials, and particularly relates to an anti-tearing plastic vest bag and a preparation method thereof. BACKGROUND

[0002] The plastic vest bag is a common plastic packaging bag with a shape similar to a vest, which mainly comprises a rectangular bag body and a top handle part, the bag body part is used for containing articles, and the handle part is an opening similar to a vest shape formed on both sides of the bag through heat pressing or the like, facilitating people to carry the bag by hand, and is widely applied in many fields such as supermarket shopping, food packaging, express delivery and logistics, agricultural packaging, household storage and advertisement promotion.

[0003] However, the plastic vest bag is prone to soft deformation under a high-temperature environment due to poor high-temperature resistance, which affects the mechanical properties of the packaging vest bag, causes the packaging vest bag to be easily broken, and further affects the service life thereof; meanwhile, the conventional PP plastic vest bag lacks polar groups in the molecular structure, which causes high surface resistivity, difficulty in discharging charges, easy accumulation of static electricity, adsorption of dust in the air by the plastic, and influence on the appearance, and further causes adhesion problems in the manufacturing process of the plastic, therefore, it has important practical significance and application value to develop an anti-tearing plastic vest bag with excellent performance. SUMMARY

[0004] In order to solve the above technical problems, the application provides an anti-tearing plastic vest bag and a preparation method thereof.

[0005] The object of the application can be achieved by the following technical scheme. An anti-tearing plastic vest bag and a preparation method thereof, comprising the following raw materials by weight: PP resin 50-80 parts, polylactic acid 0.4-0.6 parts, antistatic modifier 1-5 parts, modified anti-aging agent 1-5 parts, antioxidant 3-7 parts, plasticizer 1-5 parts, and lubricant 1-3 parts. The antioxidant is methyl phenol. The plasticizer is trioctyl trimellitate. The lubricant is polyethylene wax.

[0006] The antistatic modifier is prepared by the following method. Step A1: uniformly mix anhydrous ethanol and 2,4,6-tris(dimethylaminomethyl) phenol, 25 DEG C water bath stirring for 5 min, reaction for 30 min, temperature is increased to 45 DEG C, pH is adjusted to 7.5-8, then glycidyl methacrylate is slowly added, 45 DEG C constant temperature reaction for 8 h, and pre-product is prepared by reduced pressure rotary evaporation. Further, the amount ratio of the anhydrous ethanol, 2,4,6-tris(dimethylaminomethyl)phenol and glycidyl methacrylate is 50 mL:0.01-0.03 mol:0.03-0.09 mol; First, the ring-opening reaction of the amino group of 2,4,6-tris(dimethylaminomethyl)phenol and the epoxy group of glycidyl methacrylate is carried out to prepare a pre-product; Step A2: The undecylenic acid and toluene are uniformly mixed, and then reacted at 60°C for 3 h. Then, the pre-product and triethylamine are added, and the reaction is continued at 80°C for 5-6 h. After the reaction is completed, filtration, washing and vacuum drying for 12 h are carried out to prepare an intermediate product; Further, the amount ratio of the undecylenic acid, toluene, pre-product and triethylamine is 0.03-0.09 mol:13-15 mL:0.01-0.03 mol:2-6 mL; Secondly, the reaction of the carboxyl group of the undecylenic acid and the phenolic hydroxyl group of the pre-product is carried out to prepare the intermediate product; Step A3: The intermediate product, N-vinylpyrrolidone and acetonitrile are uniformly mixed, and then stirred for 10 min under the nitrogen environment. Then, azobisisobutyronitrile is added, and the reaction is carried out at 70°C for 3 h. After the reaction is completed, rotary evaporation and vacuum drying for 12 h are carried out to prepare the antistatic modifier; Further, the amount ratio of the intermediate product, N-vinylpyrrolidone, acetonitrile and azobisisobutyronitrile is 0.01-0.03 mol:0.01-0.03 mol:2 mL:0.25-0.35 g; Finally, the copolymerization of the carbon-carbon double bonds of the intermediate product and N-vinylpyrrolidone is carried out to prepare the antistatic modifier.

[0007] The modified anti-aging agent is prepared by the following method: Step B1: The p-aminophenol, maleic anhydride and tetrahydrofuran are uniformly mixed, and then stirred for 5-10 min in the ice water bath. The system temperature is adjusted to -5-0°C. Then, the triethylamine, mercaptopropionic acid and toluene are mixed and added. When the temperature is increased to 60°C under mechanical stirring, the condensate water is opened. Then, the temperature is continuously increased to 110°C, and the reaction is carried out for 7.5 h. Then, the temperature is decreased to 80°C, and the sodium carbonate is slowly added. After stirring for 15 min, standing, and vacuum distillation, an intermediate is prepared; Further, the amount ratio of the p-aminophenol, maleic anhydride, tetrahydrofuran, triethylamine, mercaptopropionic acid, toluene and sodium carbonate is 0.01-0.03 mol:0.01-0.03 mol:10 mL:5.5 mL:0.01-0.03 mol:50 mL:0.5-0.6 g; First, the reaction of the amino group of the p-aminophenol and the maleic anhydride is carried out. Then, the reaction of the hydroxyl group of the p-aminophenol and the carboxyl group of the mercaptopropionic acid is carried out to prepare the intermediate; Step B2: mix triallyl isocyanurate and cyclohexanone, stir at 90 DEG C for 20 min, add intermediate and triethylamine under nitrogen protection, continue to stir for 30 min, then heat to 110 DEG C, react for 4 h, after reaction, cool to room temperature, dry, and modify the anti-aging agent; Further, the amount ratio of triallyl isocyanurate, cyclohexanone, intermediate, and triethylamine is 0.01-0.03 mol: 20-80 mL: 0.03-0.09 mol: 5 mL. Finally, the modified anti-aging agent is prepared by the reaction of the mercapto group of the intermediate and the carbon-carbon double bond of triallyl isocyanurate.

[0008] A preparation method of a tear-resistant plastic vest bag, specifically comprising the following steps: S1, mixing PP resin, antistatic modifier, modified anti-aging agent, antioxidant, plasticizer and lubricant at 80-100 DEG C for 40-50 min to prepare a preliminary material; S2, mixing the preliminary material and polylactic acid at 160-200 r / min for 10-14 min, feeding into a double screw extruder, extruding, blow molding, cooling, and preparing a tear-resistant plastic vest bag.

[0009] The present application has the following advantages: The tear-resistant plastic vest bag has good antistatic effect, excellent heat resistance and aging resistance, and further prolongs the service life.

[0010] The antistatic modifier prepared by the present application has the advantages of macromolecular polymer, and exhibits antistatic performance superior to traditional small molecule antistatic agents. The quaternary ammonium salt pre-product in the antistatic modifier can neutralize the negative charge on the surface of the PP material through the cationic group, reduce the accumulation of static electricity, enhance the hydrophilicity of the material, promote moisture absorption, and the ions in the water film formed after moisture absorption act as conductive medium to accelerate the transfer and dissipation of electric charge, avoiding the negative impact of static electricity on production and product quality. Meanwhile, the cationic group of the quaternary ammonium salt pre-product can adsorb negatively charged bacteria, penetrate the bacterial cell wall, react with the proteins on the bacterial cell membrane, destroy the cell membrane structure, cause the leakage of proteins inside the bacteria, accelerate the death of bacteria, and thus improve the antibacterial effect. In addition, the polymerized N-vinyl pyrrolidone contains a hydrophilic group, which can reduce the surface resistance through ion conduction, enhance the intermolecular force, reduce the melt viscosity, and improve the flowability of the tear-resistant vest bag in the processes of film blowing and injection molding, thereby reducing static electricity generated by friction.

[0011] The maleimide group formed by maleic anhydride and amino in the prepared modified anti-aging agent can improve the glass transition temperature, melting point and heat resistance of the material by enhancing the intermolecular force, and reduce thermal aging caused by high temperature; in addition, the triallyl isocyanurate is a multifunctional olefin monomer containing an aromatic heterocyclic ring, which can form a three-dimensional crosslinking network with the PP molecular chain to limit the movement of the molecular chain, thereby improving the thermal stability of the material; meanwhile, the addition of triallyl isocyanurate can increase the crosslinking density of the PP material, so that the molecular chain is more closely connected, which helps to resist thermal decomposition and deformation under high temperature, thereby improving the heat resistance of the material; in addition, the modified anti-aging agent has good compatibility with the PP material, and can be uniformly dispersed in the PP matrix to synergistically play the heat resistance and anti-aging effects. DETAILED DESCRIPTION

[0012] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0013] Embodiment 1: a preparation method of a tear-resistant plastic vest bag, specifically comprising the following steps: S1, the raw materials are weighed by weight parts, PP resin 50 parts, polylactic acid 0.4 parts, antistatic modifier 1 part (prepared by the present embodiment), modified anti-aging agent 1 part (prepared by the present embodiment), antioxidant 3 parts, plasticizer 1 part, lubricant 1 part; the PP resin, the antistatic modifier, the modified anti-aging agent, the methyl phenol, the tricresyl phosphate and the polyethylene wax are mixed at 80℃ for 40min to prepare a preliminary material; S2, the preliminary material and the polylactic acid are mixed at 160r / min for 10min, and then sent into a double screw extruder for extrusion, blow molding, cooling to prepare a tear-resistant plastic vest bag; The antistatic modifier is prepared by the following method: Step A1: 50mL of anhydrous ethanol and 0.01mol of 2,4,6-tris (dimethylaminomethyl) phenol are uniformly mixed, stirred in a 25℃ water bath for 5min, reacted for 30min, then heated to 45℃, adjusted to pH 7.5, slowly added 0.03mol of glycidyl methacrylate, and reacted at 45℃ for 8h; vacuum rotary evaporation is performed to prepare a pre-product; Step A2: 0.03mol of undecylenic acid and 13mL of toluene are uniformly mixed, reacted at 60℃ for 3h, then 0.01mol of the pre-product and 2mL of triethylamine are added, and the reaction is continued at 80℃ for 5h; after the reaction is completed, filtration, washing and vacuum drying are performed for 12h to prepare an intermediate product; Step A3: 0.01 mol of the intermediate product, 0.01 mol of N-vinylpyrrolidone and 2 mL of acetonitrile were uniformly mixed, stirred for 10 min under a nitrogen environment, and then 0.25 g of azobisisobutyronitrile was added. The reaction was carried out at 70°C for 3 h. After the reaction was completed, rotary evaporation was performed, and vacuum drying was performed for 12 h to prepare the antistatic modifier; The modified anti-aging agent is prepared by the following method: Step B1: 0.01 mol of p-aminophenol, 0.01 mol of maleic anhydride and 10 mL of tetrahydrofuran were uniformly mixed, stirred in an ice water bath for 5 min, and the system temperature was adjusted to -5°C. 5.5 mL of triethylamine, 0.01 mol of mercaptopropionic acid and 50 mL of toluene were mixed. When the temperature was increased to 60°C under mechanical stirring, the condensate water was opened, and the temperature was further increased to 110°C. The reaction was carried out for 7.5 h. The temperature was lowered to 80°C, and 0.5 g of sodium carbonate was slowly added. After stirring for 15 min, it was placed, and vacuum distillation was performed to prepare the intermediate. Step B2: 0.01 mol of triallyl isocyanurate and 20 mL of cyclohexanone were mixed, and stirred at 90°C for 20 min. Under nitrogen protection, 0.03 mol of the intermediate and 5 mL of triethylamine were added. After stirring for 30 min, the temperature was increased to 110°C, and the reaction was carried out for 4 h. After the reaction was completed, the temperature was cooled to room temperature, and drying was performed to prepare the modified anti-aging agent.

[0014] Example 2: A preparation method of a tear-resistant plastic vest bag, specifically comprising the following steps: S1, the raw materials were weighed according to the weight parts, PP resin 65 parts, polylactic acid 0.5 parts, antistatic modifier 3 parts (prepared by this embodiment), modified anti-aging agent 3 parts (prepared by this embodiment), antioxidant 5 parts, plasticizer 3 parts, lubricant 2 parts; the PP resin, antistatic modifier, modified anti-aging agent, methyl phenol, trioctyl trimellitate and polyethylene wax were mixed at 90°C for 45 min to prepare a preliminary material; S2, the preliminary material and polylactic acid were mixed at 180 r / min for 12 min, and then were sent into a double screw extruder for extrusion. After blow molding and cooling, a tear-resistant plastic vest bag was prepared. The antistatic modifier is prepared by the following method: Step A1: 50 mL of anhydrous ethanol and 0.02 mol of 2,4,6-tris(dimethylaminomethyl) phenol were uniformly mixed, and stirred in a 25°C water bath for 5 min. The reaction was carried out for 30 min, the temperature was increased to 45°C, the pH was adjusted to 7.7, and then 0.06 mol of glycidyl methacrylate was slowly added. The reaction was carried out at 45°C for 8 h. Vacuum rotary evaporation was performed to prepare a pre-product. Step A2: 0.06 mol undecylenic acid and 14 mL of toluene were mixed uniformly, reacted at 60℃ for 3h, then 0.02 mol of the pre-product and 4 mL of triethylamine were added, and the reaction was continued at 80℃ for 5.5h. After the reaction was completed, the product was filtered, washed, and vacuum dried for 12h to obtain an intermediate product; Step A3: 0.02 mol of the intermediate product, 0.02 mol of N-vinylpyrrolidone and 2 mL of acetonitrile were mixed uniformly, stirred for 10 min under nitrogen, then 0.30 g of azobisisobutyronitrile was added, and the reaction was carried out at 70℃ for 3h. After the reaction was completed, rotary evaporation was carried out, and vacuum drying was carried out for 12h to obtain an antistatic modifier; The modified anti-aging agent was prepared by the following method: Step B1: 0.02 mol of p-aminophenol, 0.02 mol of maleic anhydride and 10 mL of tetrahydrofuran were mixed uniformly, stirred in an ice water bath for 7.5 min, the system temperature was adjusted to -3℃, 5.5 mL of triethylamine, 0.02 mol of mercaptopropionic acid and 50 mL of toluene were mixed, and the temperature was increased to 60℃ under mechanical stirring. The condensate water was opened, and the temperature was further increased to 110℃. The reaction was carried out for 7.5h, the temperature was decreased to 80℃, 0.55 g of sodium carbonate was slowly added, stirred for 15 min, and then placed. Vacuum distillation was carried out to obtain an intermediate; Step B2: 0.02 mol of triallyl isocyanurate and 50 mL of cyclohexanone were mixed, stirred at 90℃ for 20 min, 0.06 mol of the intermediate and 5 mL of triethylamine were added under nitrogen protection, and the stirring was continued for 30 min. The temperature was increased to 110℃, and the reaction was carried out for 4h. After the reaction was completed, the temperature was cooled to room temperature, and drying was carried out to obtain a modified anti-aging agent.

[0015] Example 3: A preparation method of a tear-resistant plastic vest bag, specifically comprising the following steps: S1, the raw materials were weighed according to the weight parts, PP resin 80 parts, polylactic acid 0.6 parts, antistatic modifier 5 parts (prepared by the present embodiment), modified anti-aging agent 5 parts (prepared by the present embodiment), antioxidant 7 parts, plasticizer 5 parts, lubricant 3 parts; the PP resin, the antistatic modifier, the modified anti-aging agent, the methyl phenol, the trioctyl trimellitate and the polyethylene wax were mixed at 100℃ for 50 min to obtain a preliminary material; S2, the preliminary material and the polylactic acid were mixed at 200 r / min for 14 min, and then were sent into a double screw extruder for extrusion. After blow molding and cooling, a tear-resistant plastic vest bag was obtained; The antistatic modifier was prepared by the following method: Step A1: 50 mL of anhydrous ethanol and 0.03 mol of 2,4,6-tris (dimethylaminomethyl) phenol were mixed uniformly, stirred in a 25°C water bath for 5 min, reacted for 30 min, the temperature was raised to 45°C, the pH was adjusted to 8, then 0.09 mol of glycidyl methacrylate was slowly added, and the reaction was carried out at 45°C for 8 h. The pre-product was prepared by rotary evaporation under reduced pressure. Step A2: 0.09 mol of undecylenic acid and 15 mL of toluene were mixed uniformly, reacted at 60°C for 3 h, then 0.03 mol of the pre-product and 6 mL of triethylamine were added, and the reaction was continued at 80°C for 6 h. After the reaction was completed, the product was filtered, washed, and vacuum dried for 12 h to obtain the intermediate product. Step A3: 0.03 mol of the intermediate product, 0.03 mol of N-vinylpyrrolidone, and 2 mL of acetonitrile were mixed uniformly, stirred for 10 min under nitrogen, then 0.35 g of azobisisobutyronitrile was added, and the reaction was carried out at 70°C for 3 h. After the reaction was completed, rotary evaporation was performed, and the product was vacuum dried for 12 h to obtain the antistatic modifier. The modified anti-aging agent was prepared by the following method: Step B1: 0.03 mol of p-aminophenol, 0.03 mol of maleic anhydride, and 10 mL of tetrahydrofuran were mixed uniformly, stirred in an ice water bath for 10 min, the temperature of the system was adjusted to 0°C, 5.5 mL of triethylamine, 0.03 mol of mercaptopropionic acid, and 50 mL of toluene were mixed, and the temperature was raised to 60°C while stirring mechanically. The condensate water was opened, and the temperature was further raised to 110°C. The reaction was carried out for 7.5 h, the temperature was lowered to 80°C, 0.6 g of sodium carbonate was slowly added, stirred for 15 min, and then left to stand. The product was prepared by distillation under reduced pressure. Step B2: 0.03 mol of triallyl isocyanurate and 80 mL of cyclohexanone were mixed, stirred at 90°C for 20 min, 0.09 mol of the intermediate and 5 mL of triethylamine were added under nitrogen protection, and the stirring was continued for 30 min. The temperature was raised to 110°C, and the reaction was carried out for 4 h. After the reaction was completed, the temperature was cooled to room temperature, and the product was dried to obtain the modified anti-aging agent.

[0016] Comparative Example 1: This comparative example is a tear-resistant plastic vest bag, which is different from Example 3 in that an equal amount of carbon black is used instead of the antistatic modifier prepared in Example 3, and the rest is the same.

[0017] Comparative Example 2: This comparative example is a tear-resistant plastic vest bag, which is different from Example 3 in that an equal amount of antioxidant 1010 is used instead of the modified anti-aging agent prepared in Example 3, and the rest is the same.

[0018] Performance test: the anti-tear plastic vest bag prepared by the examples 1-3 and the comparative examples 1-2 is cut into a standard test size, and the surface resistivity test is carried out according to GB / T1410-2006, the BLUESTAR--X65 type xenon lamp is used, the aging resistance test is carried out according to the standard GB / T16422.2, the antibacterial test is carried out according to the standard QB / T 2591-2003, and the test results are shown in the following table 1. Table 1

[0019] It can be known from the data in the table 1 that the anti-tear plastic vest bag prepared by the application has good antistatic and tensile strength effects, and it can be seen from the table 1 that the anti-tear plastic vest bag prepared by the application has good heat resistance and aging resistance effects, and the service life is prolonged.

[0020] The above content is only an example and description of the concept of the application, and those skilled in the art can make various modifications or supplements to the described specific embodiments or use similar ways to replace, as long as the concept of the application is not deviated or the scope defined by the present application is not exceeded, which shall belong to the protection scope of the application.

Claims

1. A method for preparing a tear-resistant plastic vest bag, characterized in that, Specifically, the following steps are included: S1. Weigh the raw materials according to the following parts by weight: 50-80 parts of PP resin, 0.4-0.6 parts of polylactic acid, 1-5 parts of antistatic modifier, 1-5 parts of modified aging resistant agent, 3-7 parts of antioxidant, 1-5 parts of plasticizer, and 1-3 parts of lubricant; mix the PP resin, antistatic modifier, modified aging resistant agent, antioxidant, plasticizer, and lubricant at 80-100℃ for 40-50 minutes to obtain the preliminary material; S2. Mix the initial material and polylactic acid at 160-200 r / min for 10-14 min, feed them into a twin-screw extruder, extrude, blow mold, and cool to obtain a tear-resistant plastic vest bag. The antistatic modifier is prepared by the following method: Step A1: Mix anhydrous ethanol and 2,4,6-tris(dimethylaminomethyl)phenol evenly, stir in a water bath at 25°C for 5 min, react for 30 min, raise the temperature to 45°C, adjust the pH to 7.5-8, slowly add glycidyl methacrylate, react at 45°C for 8 h, and evaporate under reduced pressure to obtain the preproduct. Step A2: Mix undecenoic acid and toluene evenly, react at 60°C for 3 hours, then add the preproduct and triethylamine, and continue the reaction at 80°C for 5-6 hours. After the reaction is complete, filter, wash, and vacuum dry for 12 hours to obtain the intermediate product. Step A3: Mix the intermediate product, N-vinylpyrrolidone and acetonitrile evenly, stir for 10 min under nitrogen atmosphere, then add azobisisobutyronitrile, react at 70℃ for 3 h, after the reaction is completed, rotary evaporate and vacuum dry for 12 h to obtain the antistatic modifier.

2. The method for preparing a tear-resistant plastic vest bag according to claim 1, characterized in that, In step A1, the ratio of anhydrous ethanol, 2,4,6-tris(dimethylaminomethyl)phenol, and glycidyl methacrylate is 50 mL: 0.01-0.03 mol: 0.03-0.09 mol.

3. The method for preparing a tear-resistant plastic vest bag according to claim 1, characterized in that, In step A2, the ratio of undecenoic acid, toluene, preproduct, and triethylamine is 0.01-0.03 mol: 13-15 mL: 0.03-0.09 mol: 2-6 mL.

4. The method for preparing a tear-resistant plastic vest bag according to claim 1, characterized in that, The ratio of intermediate product, N-vinylpyrrolidone, acetonitrile, and azobisisobutyronitrile in step A3 is 0.01-0.03 mol: 0.01-0.03 mol: 2 mL: 0.25-0.35 g.

5. The method for preparing a tear-resistant plastic vest bag according to claim 1, characterized in that, The modified anti-aging agent is prepared by the following method: Step B1: Mix p-aminophenol, maleic anhydride and tetrahydrofuran evenly, stir in an ice-water bath for 5-10 min, adjust the system temperature to -5-0℃, add triethylamine, mercaptopropionic acid and toluene and mix, heat to 60℃ with mechanical stirring, turn on the cooling water, continue to heat to 110℃, react for 7.5 h, cool to 80℃, slowly add sodium carbonate, stir for 15 min and let stand, distill under reduced pressure to obtain the intermediate; Step B2: Mix triallyl isocyanurate and cyclohexanone, stir at 90°C for 20 min, add intermediate and triethylamine under nitrogen protection, continue stirring for 30 min, then heat to 110°C and react for 4 h. After the reaction is complete, cool to room temperature and dry to obtain the modified anti-aging agent.

6. The method for preparing a tear-resistant plastic vest bag according to claim 5, characterized in that, In step B1, the ratio of the amounts of p-aminophenol, maleic anhydride, tetrahydrofuran, triethylamine, mercaptopropionic acid, toluene, and sodium carbonate is 0.01-0.03 mol: 0.01-0.03 mol: 10 mL: 5.5 mL: 0.01-0.03 mol: 50 mL: 0.5-0.6 g.

7. The method for preparing a tear-resistant plastic vest bag according to claim 5, characterized in that, In step B2, the ratio of triallyl isocyanurate, cyclohexanone, intermediate, and triethylamine is 0.01-0.03 mol: 20-80 mL: 0.03-0.09 mol: 5 mL.

8. The method for preparing a tear-resistant plastic vest bag according to claim 1, characterized in that, The antioxidant is methylphenol, the plasticizer is trioctyl trimellitate, and the lubricant is polyethylene wax.

9. A tear-resistant plastic vest bag, characterized in that, Prepared according to any one of claims 1-8.

Images