High-temperature-resistant polypropylene plastic woven bag and preparation process thereof

Abstract

The invention belongs to the technical field of packaging, particularly relates to a high-temperature-resistant polypropylene plastic woven bag and a preparation process thereof, and provides the following scheme aiming at the problems of low heat resistance and high aging speed in the prior art: the high-temperature-resistant polypropylene plastic woven bag comprises a woven bag main body and a heat-resistant layer adhered to the surface of the woven bag main body, the woven bag main body comprises the following raw materials in parts by mass: 80-90 parts of homo-polypropylene, 3.0-5.0 parts of polyethylene, 1.0-2.0 parts of an additive, 3.0-8.0 parts of a heat-resistant modifier and 1.0-3.0 parts of an additive, the heat-resistant modifier comprises a nucleating agent, a heat stabilizer and modified titanium dioxide, and the additive comprises modified carbon black, an antioxidant and a lubricant. The polypropylene plastic woven bag has the advantages that the high-temperature resistance of the polypropylene plastic woven bag can be improved, the anti-aging performance of the polypropylene plastic woven bag is high in a high-temperature state, and the strength of the polypropylene plastic woven bag is not easily reduced too much due to high temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging, in particular to a high-temperature resistant polypropylene plastic woven bag and a preparation process thereof. Background Art

[0002] Polypropylene plastic woven bag is a common woven bag. The Chinese patent document with application number 202310493055.X discloses a high-strength polypropylene plastic woven bag and a preparation method thereof, wherein a silver-doped titanium-based organic skeleton is introduced into the flat yarn; after calcining the silver-doped titanium-based organic skeleton, a stable silver-doped porous titanium dioxide is obtained, and then in-situ free radical polymerization and quaternization are used to react with 3-bromopropyl-5,5-dimethylhydantoin and sodium hypochlorite to prepare a multi-grafted quaternized silver-doped porous titanium dioxide; a prepolymer is prepared using urushiol, a derivative of catechol with an unsaturated long side carbon chain, and isophorone diisocyanate, and furfurylamine and 2,2-dithiodiethanol are used as chain extenders to introduce disulfide bonds and furan groups into polyurethane, and polydimethylsiloxane with low surface energy properties is used as a raw material to synthesize bismaleimide containing polydimethylsiloxane as a curing agent, and quaternized silver-doped porous titanium dioxide is used as a toughening agent and antibacterial agent to prepare a protective impregnation solution.

[0003] However, the high-strength polypropylene plastic woven bag and its preparation method also have some problems. For example, the heat resistance of the polypropylene plastic woven bag is low. Under high temperature conditions, the polypropylene plastic woven bag is easily deformed and ages too quickly under high temperature. Summary of the Invention

[0004] Based on the problems of low heat resistance and fast aging in the background technology, the present invention proposes a high-temperature resistant polypropylene plastic woven bag and a preparation process thereof.

[0005] The present invention proposes a high-temperature resistant polypropylene plastic woven bag, which includes a woven bag main body and a heat-resistant layer adhered to the surface of the woven bag main body. The raw materials of the woven bag main body are composed of the following components by mass: 80 to 90 parts of homopolypropylene, 3.0 to 5.0 parts of polyethylene, 1.0 to 2.0 parts of additives, 3.0 to 8.0 parts of heat-resistant modifiers and 1.0 to 3.0 parts of additives. The heat-resistant modifiers include nucleating agents, heat stabilizers and modified titanium dioxide. The additives include modified carbon black, antioxidants and lubricants. The additives include nanoclay and carbon nanotubes. The raw material of the heat-resistant layer is polyvinyl alcohol solution. The polypropylene plastic woven bag made of homopolypropylene, polyethylene, additives, heat-resistant modifiers and additives can improve the high-temperature resistance of the polypropylene plastic woven bag. At the same time, under high temperature conditions, the polypropylene plastic woven bag has high anti-aging performance and is not easily reduced in strength too much due to high temperature.

[0006] Preferably, the weight ratio of the nucleating agent, the thermal stabilizer and the modified titanium dioxide in the heat-resistant modifier is 1:2:25, the nucleating agent is one of a sorbitol nucleating agent and a carboxylate nucleating agent, the sorbitol nucleating agent is Millad3988, the carboxylate nucleating agent is calcium stearate, and the thermal stabilizer is one of a hindered phenol thermal stabilizer and a phosphate thermal stabilizer, the hindered phenol thermal stabilizer is Irganox1010, and the phosphate thermal stabilizer is Irgafos168, which can ensure the performance of the woven bag body.

[0007] Preferably, the raw materials of the modified titanium dioxide include titanium dioxide, phosphate solution, iron salt solution, silane coupling agent and alumina powder, and the weight ratio of titanium dioxide, phosphate solution, iron salt solution, silane coupling agent and alumina powder is 10:3:3:1, which can ensure the modification effect of titanium dioxide.

[0008] Preferably, the preparation method of the modified titanium dioxide comprises the following steps: titanium dioxide, phosphate, iron salt, silane coupling agent and alumina powder are weighed in proportion; S1: titanium dioxide pretreatment: titanium dioxide is poured into deionized water and ultrasonically treated for 10 to 20 minutes to disperse and form a uniform suspension with a solid content of 10% to 20%, thereby obtaining a titanium dioxide solution; S2: phosphate treatment: the titanium dioxide solution is slowly added to the phosphate solution, the pH is adjusted to 8 to 10, and the reaction is stirred at a temperature of 60°C to 80°C for 1 to 2 hours, wherein the phosphate reacts with the surface hydroxyl group of the titanium dioxide to form a Ti-OP bond, thereby increasing the surface hydrophilicity; S3: iron salt coprecipitation: the iron salt solution is added dropwise to form a nanolayer-coated titanium dioxide to obtain a preliminary modified titanium dioxide; and the pH is adjusted to neutral after the reaction. Filter, wash, and dry; S4: Preparation of silane solution: dissolve the silane coupling agent in ethanol at 1-3wt%, adjust the pH to 4-5 with acetic acid, hydrolyze for 30 minutes, add the primary modified titanium dioxide to the silane solution, stir and react at a temperature of 70℃-80℃ for 3 hours, centrifuge, wash with ethanol, and dry at 80℃ to obtain secondary modified titanium dioxide; S5: disperse the secondary modified titanium dioxide in aluminum salt solution, add ammonia water as a precipitant, react at a temperature of 80℃ to generate Al(OH)3 gel, and then calcine at a high temperature of 500-600℃, then add alumina powder and ball mill for 2-4 hours to form composite particles by physical adsorption, grind to obtain modified titanium dioxide, which is convenient for the subsequent production of modified titanium dioxide.

[0009] Preferably, the weight ratio of modified carbon black, antioxidant and lubricant in the additive is 3:2:2, which can effectively exert the efficacy of the additive.

[0010] Preferably, the raw materials of the modified carbon black include carbon black, MMA, AIBN and DMF, and the weight ratio of carbon black, MMA, AIBN and DMF is 19:2:1:12, which facilitates the subsequent modification of the carbon black.

[0011] Preferably, the preparation method of the modified carbon black is as follows: carbon black, MMA, and AIBN are dispersed in a solvent DMF, heated to 70°C-80°C, reacted under nitrogen protection for 6 hours to 12 hours, centrifuged and washed to remove ungrafted homopolymers to obtain modified carbon black, which can effectively enhance the performance of the flat yarn.

[0012] A preparation process for a high-temperature resistant polypropylene plastic woven bag comprises the following steps: S1: Homopolymer polypropylene, polyethylene, additives, heat-resistant modifier and additives are weighed in proportion, and then poured into a high-speed mixer and uniformly mixed to obtain a mixture; S2: The mixed material is poured into the interior of the extruder for melting and extrusion. The melt is extruded through a ring die, water-cooled, and then drawn to form a flat yarn. The flat yarn is heat-set in a hot oven to eliminate internal stress and obtain a flat yarn body. S3: Using a circular loom, the flat yarn is woven into a tubular cloth, which is then coated with a polyvinyl alcohol solution and dried to form a heat-resistant layer; S4: Use heat sealing to make bags, use high temperature resistant ink to print labels, and cut to obtain high temperature resistant polypropylene plastic woven bags.

[0013] Preferably, in S2, the extrusion temperature is 200°C-250°C, the draw ratio is 1:6-1:8, and the temperature of the hot oven is controlled at 100°C-120°C to facilitate extrusion molding.

[0014] Preferably, in S3, the warp and weft density of the tubular cloth is 10×10 strands / inch to 14×14 strands / inch to ensure the performance of the woven bag.

[0015] Beneficial effects of the present invention: Polypropylene plastic woven bags made of homopolymer polypropylene, polyethylene, additives, heat-resistant modifiers and additives can improve the high temperature resistance of polypropylene plastic woven bags. At the same time, under high temperature conditions, the anti-aging performance of polypropylene plastic woven bags is high, and it is not easy for the strength of polypropylene plastic woven bags to decrease too much due to high temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The working flow diagram proposed by the present invention. DETAILED DESCRIPTION

[0017] The present invention will be further explained below with reference to specific embodiments.

[0018] Reference Figure 1 , Example 1This embodiment provides a high-temperature resistant polypropylene plastic woven bag, which includes a woven bag body and a heat-resistant layer adhered to the surface of the woven bag body. The raw materials of the woven bag body are composed of the following components by mass: 84 parts of homopolymer polypropylene, 4.6 parts of polyethylene, 1.4 parts of additives, 7.0 parts of heat-resistant modifier and 3.0 parts of additives, the heat-resistant modifier includes a nucleating agent, a heat stabilizer and modified titanium dioxide, the additives include modified carbon black, an antioxidant and a lubricant, the additives include nano clay and carbon nanotubes, the raw material of the heat-resistant layer is polyvinyl alcohol solution, the weight ratio of the nucleating agent, the heat stabilizer and the modified titanium dioxide in the heat-resistant modifier is 1:2:25, the nucleating agent is one of a sorbitol nucleating agent and a carboxylate nucleating agent, the sorbitol nucleating agent is Millad3988, the carboxylate nucleating agent is calcium stearate, the heat stabilizer is a hindered phenol heat stabilizer, the hindered phenol heat stabilizer is Irganox1010, the phosphate heat stabilizer is Irgafos168, the raw material of the modified titanium dioxide includes The invention relates to titanium dioxide, phosphate solution, iron salt solution, silane coupling agent and alumina powder, wherein the weight ratio of titanium dioxide, phosphate solution, iron salt solution, silane coupling agent and alumina powder is 10:3:3:1. The preparation method of modified titanium dioxide is as follows: titanium dioxide, phosphate, iron salt, silane coupling agent and alumina powder are weighed in proportion. S1: titanium dioxide pretreatment: titanium dioxide is poured into deionized water and ultrasonically treated for 17 minutes to disperse and form a uniform suspension with a solid content of 15%, thereby obtaining a titanium dioxide solution; S2: phosphate treatment: titanium dioxide solution is slowly added to phosphate solution, pH is adjusted to 9, and the reaction is stirred at 76°C for 2 hours. Phosphate reacts with hydroxyl groups on the surface of titanium dioxide to form Ti-OP bond to improve surface hydrophilicity; S3: Iron salt co-precipitation: add iron salt solution to generate a nano-layer coated titanium dioxide to obtain preliminary modified titanium dioxide, adjust the pH to neutral after the reaction, filter, wash and dry; S4: Preparation of silane solution: dissolve the silane coupling agent in ethanol at 2wt%, adjust the pH to 5 with acetic acid, hydrolyze for 30 minutes, add the preliminary modified titanium dioxide to the silane solution, stir and react at 75℃ for 3 hours, centrifuge, wash with ethanol, and dry at 80℃ to obtain secondary modified titanium dioxide; S5: disperse the secondary modified titanium dioxide in aluminum salt solution, add ammonia water as a precipitant, and react at 80℃ to generate Al(OH)3 gel. The modified titanium dioxide is then calcined at 500-600°C. Alumina powder is then added and ball-milled for 2-4 hours. Physical adsorption forms composite particles, which are then ground to obtain modified titanium dioxide. The weight ratio of modified carbon black, antioxidant, and lubricant in the additives is 3:2:2. The raw materials for the modified carbon black include carbon black, MMA, AIBN, and DMF. The weight ratio of carbon black, MMA, AIBN, and DMF is 19:2:1:12. The modified carbon black is prepared by dispersing carbon black, MMA, and AIBN in DMF, a solvent. The mixture is heated to 70-80°C and reacted under nitrogen for 6-12 hours. The mixture is then centrifuged and washed to remove the ungrafted homopolymer, yielding the modified carbon black.

[0019] A preparation process for a high-temperature resistant polypropylene plastic woven bag comprises the following steps: S1: Homopolymer polypropylene, polyethylene, additives, heat-resistant modifier and additives are weighed in proportion, and then poured into a high-speed mixer and uniformly mixed to obtain a mixture; S2: The mixed material is poured into the interior of the extruder for melting and extrusion. The melt is extruded through a ring die, water-cooled, and then drawn to form a flat yarn. The flat yarn is heat-set in a hot oven to eliminate internal stress and obtain a flat yarn body. The extrusion temperature is 240°C, the draw ratio is 1:8, and the temperature of the hot oven is controlled at 110°C. S3: Using a circular loom, the flat yarn is woven into a tubular cloth, which is then coated with a polyvinyl alcohol solution and dried to form a heat-resistant layer. The warp and weft density of the tubular cloth is 14×14 threads / inch; S4: Use heat sealing to make bags, use high temperature resistant ink to print labels, and cut to obtain high temperature resistant polypropylene plastic woven bags.

[0020] Reference Figure 1 , Example 2 This embodiment provides a high-temperature resistant polypropylene plastic woven bag, which includes a woven bag body and a heat-resistant layer adhered to the surface of the woven bag body. The raw materials of the woven bag body are composed of the following components by mass: 84 parts of homopolymer polypropylene, 4.0 parts of polyethylene, 2.0 parts of additives, 7.5 parts of heat-resistant modifier and 2.5 parts of additives, the heat-resistant modifier includes a nucleating agent, a heat stabilizer and modified titanium dioxide, the additives include modified carbon black, an antioxidant and a lubricant, the additives include nano clay and carbon nanotubes, the raw material of the heat-resistant layer is a polyvinyl alcohol solution, the weight ratio of the nucleating agent, the heat stabilizer and the modified titanium dioxide in the heat-resistant modifier is 1:2:25, the nucleating agent is one of a sorbitol nucleating agent and a carboxylate nucleating agent, the sorbitol nucleating agent is Millad3988, the carboxylate nucleating agent is calcium stearate, the heat stabilizer is a hindered phenol heat stabilizer, the hindered phenol heat stabilizer is Irganox1010, the phosphate heat stabilizer is Irgafos168, the raw material of the modified titanium dioxide includes The invention relates to titanium dioxide, phosphate solution, iron salt solution, silane coupling agent and alumina powder, wherein the weight ratio of titanium dioxide, phosphate solution, iron salt solution, silane coupling agent and alumina powder is 10:3:3:1. The preparation method of modified titanium dioxide is as follows: titanium dioxide, phosphate, iron salt, silane coupling agent and alumina powder are weighed in proportion. S1: titanium dioxide pretreatment: titanium dioxide is poured into deionized water and ultrasonically treated for 17 minutes to disperse and form a uniform suspension with a solid content of 15%, thereby obtaining a titanium dioxide solution; S2: phosphate treatment: titanium dioxide solution is slowly added to phosphate solution, pH is adjusted to 9, and the reaction is stirred at 76°C for 2 hours. Phosphate reacts with hydroxyl groups on the surface of titanium dioxide to form Ti-OP bond to improve surface hydrophilicity; S3: Iron salt co-precipitation: add iron salt solution to generate a nano-layer coated titanium dioxide to obtain preliminary modified titanium dioxide, adjust the pH to neutral after the reaction, filter, wash and dry; S4: Preparation of silane solution: dissolve the silane coupling agent in ethanol at 2wt%, adjust the pH to 5 with acetic acid, hydrolyze for 30 minutes, add the preliminary modified titanium dioxide to the silane solution, stir and react at 75℃ for 3 hours, centrifuge, wash with ethanol, and dry at 80℃ to obtain secondary modified titanium dioxide; S5: disperse the secondary modified titanium dioxide in aluminum salt solution, add ammonia water as a precipitant, and react at 80℃ to generate Al(OH)3 gel. The modified titanium dioxide is then calcined at 500-600°C. Alumina powder is then added and ball-milled for 2-4 hours. Physical adsorption forms composite particles, which are then ground to obtain modified titanium dioxide. The weight ratio of modified carbon black, antioxidant, and lubricant in the additives is 3:2:2. The raw materials for the modified carbon black include carbon black, MMA, AIBN, and DMF. The weight ratio of carbon black, MMA, AIBN, and DMF is 19:2:1:12. The modified carbon black is prepared by dispersing carbon black, MMA, and AIBN in DMF, a solvent. The mixture is heated to 70-80°C and reacted under nitrogen for 6-12 hours. The mixture is then centrifuged and washed to remove the ungrafted homopolymer, yielding the modified carbon black.

[0021] A preparation process for a high-temperature resistant polypropylene plastic woven bag comprises the following steps: S1: Homopolymer polypropylene, polyethylene, additives, heat-resistant modifier and additives are weighed in proportion, and then poured into a high-speed mixer and uniformly mixed to obtain a mixture; S2: The mixed material is poured into the interior of the extruder for melting and extrusion. The melt is extruded through a ring die, water-cooled, and then drawn to form a flat yarn. The flat yarn is heat-set in a hot oven to eliminate internal stress and obtain a flat yarn body. The extrusion temperature is 240°C, the draw ratio is 1:8, and the temperature of the hot oven is controlled at 110°C. S3: Using a circular loom, the flat yarn is woven into a tubular cloth, which is then coated with a polyvinyl alcohol solution and dried to form a heat-resistant layer. The warp and weft density of the tubular cloth is 14×14 threads / inch; S4: Use heat sealing to make bags, use high temperature resistant ink to print labels, and cut to obtain high temperature resistant polypropylene plastic woven bags.

[0022] Reference Figure 1 , Example 3 This embodiment provides a high-temperature resistant polypropylene plastic woven bag, which includes a woven bag body and a heat-resistant layer adhered to the surface of the woven bag body. The raw materials of the woven bag body are composed of the following components by mass: 85 parts of homopolymer polypropylene, 4.5 parts of polyethylene, 1.5 parts of additives, 6.5 parts of heat-resistant modifier and 2.5 parts of additives, the heat-resistant modifier includes a nucleating agent, a heat stabilizer and modified titanium dioxide, the additives include modified carbon black, an antioxidant and a lubricant, the additives include nano clay and carbon nanotubes, the raw material of the heat-resistant layer is a polyvinyl alcohol solution, the weight ratio of the nucleating agent, the heat stabilizer and the modified titanium dioxide in the heat-resistant modifier is 1:2:25, the nucleating agent is one of a sorbitol nucleating agent and a carboxylate nucleating agent, the sorbitol nucleating agent is Millad3988, the carboxylate nucleating agent is calcium stearate, the heat stabilizer is a hindered phenol heat stabilizer, the hindered phenol heat stabilizer is Irganox1010, the phosphate heat stabilizer is Irgafos168, the raw material of the modified titanium dioxide includes The invention relates to titanium dioxide, phosphate solution, iron salt solution, silane coupling agent and alumina powder, wherein the weight ratio of titanium dioxide, phosphate solution, iron salt solution, silane coupling agent and alumina powder is 10:3:3:1. The preparation method of modified titanium dioxide is as follows: titanium dioxide, phosphate, iron salt, silane coupling agent and alumina powder are weighed in proportion. S1: titanium dioxide pretreatment: titanium dioxide is poured into deionized water and ultrasonically treated for 17 minutes to disperse and form a uniform suspension with a solid content of 15%, thereby obtaining a titanium dioxide solution; S2: phosphate treatment: titanium dioxide solution is slowly added to phosphate solution, pH is adjusted to 9, and the reaction is stirred at 76°C for 2 hours. Phosphate reacts with hydroxyl groups on the surface of titanium dioxide to form Ti-OP bond to improve surface hydrophilicity; S3: Iron salt co-precipitation: add iron salt solution to generate a nano-layer coated titanium dioxide to obtain preliminary modified titanium dioxide, adjust the pH to neutral after the reaction, filter, wash and dry; S4: Preparation of silane solution: dissolve the silane coupling agent in ethanol at 2wt%, adjust the pH to 5 with acetic acid, hydrolyze for 30 minutes, add the preliminary modified titanium dioxide to the silane solution, stir and react at 75℃ for 3 hours, centrifuge, wash with ethanol, and dry at 80℃ to obtain secondary modified titanium dioxide; S5: disperse the secondary modified titanium dioxide in aluminum salt solution, add ammonia water as a precipitant, and react at 80℃ to generate Al(OH)3 gel. The modified titanium dioxide is then calcined at 500-600°C. Alumina powder is then added and ball-milled for 2-4 hours. Physical adsorption forms composite particles, which are then ground to obtain modified titanium dioxide. The weight ratio of modified carbon black, antioxidant, and lubricant in the additives is 3:2:2. The raw materials for the modified carbon black include carbon black, MMA, AIBN, and DMF. The weight ratio of carbon black, MMA, AIBN, and DMF is 19:2:1:12. The modified carbon black is prepared by dispersing carbon black, MMA, and AIBN in DMF, a solvent. The mixture is heated to 70-80°C and reacted under nitrogen for 6-12 hours. The mixture is then centrifuged and washed to remove the ungrafted homopolymer, yielding the modified carbon black.

[0023] A preparation process for a high-temperature resistant polypropylene plastic woven bag comprises the following steps: S1: Homopolymer polypropylene, polyethylene, additives, heat-resistant modifier and additives are weighed in proportion, and then poured into a high-speed mixer and uniformly mixed to obtain a mixture; S2: The mixed material is poured into the interior of the extruder for melting and extrusion. The melt is extruded through a ring die, water-cooled, and then drawn to form a flat yarn. The flat yarn is heat-set in a hot oven to eliminate internal stress and obtain a flat yarn body. The extrusion temperature is 240°C, the draw ratio is 1:8, and the temperature of the hot oven is controlled at 110°C. S3: Using a circular loom, the flat yarn is woven into a tubular cloth, which is then coated with a polyvinyl alcohol solution and dried to form a heat-resistant layer. The warp and weft density of the tubular cloth is 14×14 threads / inch; S4: Use heat sealing to make bags, use high temperature resistant ink to print labels, and cut to obtain high temperature resistant polypropylene plastic woven bags.

[0024] Reference Figure 1 , Example 4 This embodiment provides a high-temperature resistant polypropylene plastic woven bag, which includes a woven bag body and a heat-resistant layer adhered to the surface of the woven bag body. The raw materials of the woven bag body are composed of the following components by mass: 86 parts of homopolymer polypropylene, 4.5 parts of polyethylene, 1.5 parts of additives, 6.0 parts of heat-resistant modifier and 2.0 parts of additives, the heat-resistant modifier includes a nucleating agent, a heat stabilizer and modified titanium dioxide, the additives include modified carbon black, an antioxidant and a lubricant, the additives include nano clay and carbon nanotubes, the raw material of the heat-resistant layer is polyvinyl alcohol solution, the weight ratio of the nucleating agent, the heat stabilizer and the modified titanium dioxide in the heat-resistant modifier is 1:2:25, the nucleating agent is one of a sorbitol nucleating agent and a carboxylate nucleating agent, the sorbitol nucleating agent is Millad3988, the carboxylate nucleating agent is calcium stearate, the heat stabilizer is a hindered phenol heat stabilizer, the hindered phenol heat stabilizer is Irganox1010, the phosphate heat stabilizer is Irgafos168, the raw material of the modified titanium dioxide includes The invention relates to titanium dioxide, phosphate solution, iron salt solution, silane coupling agent and alumina powder, wherein the weight ratio of titanium dioxide, phosphate solution, iron salt solution, silane coupling agent and alumina powder is 10:3:3:1. The preparation method of modified titanium dioxide is as follows: titanium dioxide, phosphate, iron salt, silane coupling agent and alumina powder are weighed in proportion. S1: titanium dioxide pretreatment: titanium dioxide is poured into deionized water and ultrasonically treated for 17 minutes to disperse and form a uniform suspension with a solid content of 15%, thereby obtaining a titanium dioxide solution; S2: phosphate treatment: titanium dioxide solution is slowly added to phosphate solution, pH is adjusted to 9, and the reaction is stirred at 76°C for 2 hours. Phosphate reacts with hydroxyl groups on the surface of titanium dioxide to form Ti-OP bond to improve surface hydrophilicity; S3: Iron salt co-precipitation: add iron salt solution to generate a nano-layer coated titanium dioxide to obtain preliminary modified titanium dioxide, adjust the pH to neutral after the reaction, filter, wash and dry; S4: Preparation of silane solution: dissolve the silane coupling agent in ethanol at 2wt%, adjust the pH to 5 with acetic acid, hydrolyze for 30 minutes, add the preliminary modified titanium dioxide to the silane solution, stir and react at 75℃ for 3 hours, centrifuge, wash with ethanol, and dry at 80℃ to obtain secondary modified titanium dioxide; S5: disperse the secondary modified titanium dioxide in aluminum salt solution, add ammonia water as a precipitant, and react at 80℃ to generate Al(OH)3 gel. The modified titanium dioxide is then calcined at 500-600°C. Alumina powder is then added and ball-milled for 2-4 hours. Physical adsorption forms composite particles, which are then ground to obtain modified titanium dioxide. The weight ratio of modified carbon black, antioxidant, and lubricant in the additives is 3:2:2. The raw materials for the modified carbon black include carbon black, MMA, AIBN, and DMF. The weight ratio of carbon black, MMA, AIBN, and DMF is 19:2:1:12. The modified carbon black is prepared by dispersing carbon black, MMA, and AIBN in DMF, a solvent. The mixture is heated to 70-80°C and reacted under nitrogen for 6-12 hours. The mixture is then centrifuged and washed to remove the ungrafted homopolymer, yielding the modified carbon black.

[0025] A preparation process for a high-temperature resistant polypropylene plastic woven bag comprises the following steps: S1: Homopolymer polypropylene, polyethylene, additives, heat-resistant modifier and additives are weighed in proportion, and then poured into a high-speed mixer and uniformly mixed to obtain a mixture; S2: The mixed material is poured into the interior of the extruder for melting and extrusion. The melt is extruded through a ring die, water-cooled, and then drawn to form a flat yarn. The flat yarn is heat-set in a hot oven to eliminate internal stress and obtain a flat yarn body. The extrusion temperature is 240°C, the draw ratio is 1:8, and the temperature of the hot oven is controlled at 110°C. S3: Using a circular loom, the flat yarn is woven into a tubular cloth, which is then coated with a polyvinyl alcohol solution and dried to form a heat-resistant layer. The warp and weft density of the tubular cloth is 14×14 threads / inch; S4: Use heat sealing to make bags, use high temperature resistant ink to print labels, and cut to obtain high temperature resistant polypropylene plastic woven bags.

[0026] Reference Figure 1 , Example 5 This embodiment provides a high-temperature resistant polypropylene plastic woven bag, which includes a woven bag body and a heat-resistant layer adhered to the surface of the woven bag body. The raw materials of the woven bag body are composed of the following components by mass: 87 parts of homopolymer polypropylene, 4.0 parts of polyethylene, 2.0 parts of additives, 5.5 parts of heat-resistant modifier and 1.5 parts of additives, the heat-resistant modifier includes a nucleating agent, a heat stabilizer and modified titanium dioxide, the additives include modified carbon black, an antioxidant and a lubricant, the additives include nano clay and carbon nanotubes, the raw material of the heat-resistant layer is a polyvinyl alcohol solution, the weight ratio of the nucleating agent, the heat stabilizer and the modified titanium dioxide in the heat-resistant modifier is 1:2:25, the nucleating agent is one of a sorbitol nucleating agent and a carboxylate nucleating agent, the sorbitol nucleating agent is Millad3988, the carboxylate nucleating agent is calcium stearate, the heat stabilizer is a hindered phenol heat stabilizer, the hindered phenol heat stabilizer is Irganox1010, the phosphate heat stabilizer is Irgafos168, the raw material of the modified titanium dioxide includes The invention relates to titanium dioxide, phosphate solution, iron salt solution, silane coupling agent and alumina powder, wherein the weight ratio of titanium dioxide, phosphate solution, iron salt solution, silane coupling agent and alumina powder is 10:3:3:1. The preparation method of modified titanium dioxide is as follows: titanium dioxide, phosphate, iron salt, silane coupling agent and alumina powder are weighed in proportion. S1: titanium dioxide pretreatment: titanium dioxide is poured into deionized water and ultrasonically treated for 17 minutes to disperse and form a uniform suspension with a solid content of 15%, thereby obtaining a titanium dioxide solution; S2: phosphate treatment: titanium dioxide solution is slowly added to phosphate solution, pH is adjusted to 9, and the reaction is stirred at 76°C for 2 hours. Phosphate reacts with hydroxyl groups on the surface of titanium dioxide to form Ti-OP bond to improve surface hydrophilicity; S3: Iron salt co-precipitation: add iron salt solution to generate a nano-layer coated titanium dioxide to obtain preliminary modified titanium dioxide, adjust the pH to neutral after the reaction, filter, wash and dry; S4: Preparation of silane solution: dissolve the silane coupling agent in ethanol at 2wt%, adjust the pH to 5 with acetic acid, hydrolyze for 30 minutes, add the preliminary modified titanium dioxide to the silane solution, stir and react at 75℃ for 3 hours, centrifuge, wash with ethanol, and dry at 80℃ to obtain secondary modified titanium dioxide; S5: disperse the secondary modified titanium dioxide in aluminum salt solution, add ammonia water as a precipitant, and react at 80℃ to generate Al(OH)3 gel. The modified titanium dioxide is then calcined at 500-600°C. Alumina powder is then added and ball-milled for 2-4 hours. Physical adsorption forms composite particles, which are then ground to obtain modified titanium dioxide. The weight ratio of modified carbon black, antioxidant, and lubricant in the additives is 3:2:2. The raw materials for the modified carbon black include carbon black, MMA, AIBN, and DMF. The weight ratio of carbon black, MMA, AIBN, and DMF is 19:2:1:12. The modified carbon black is prepared by dispersing carbon black, MMA, and AIBN in DMF, a solvent. The mixture is heated to 70-80°C and reacted under nitrogen for 6-12 hours. The mixture is then centrifuged and washed to remove the ungrafted homopolymer, yielding the modified carbon black.

[0027] A preparation process for a high-temperature resistant polypropylene plastic woven bag comprises the following steps: S1: Homopolymer polypropylene, polyethylene, additives, heat-resistant modifier and additives are weighed in proportion, and then poured into a high-speed mixer and uniformly mixed to obtain a mixture; S2: The mixed material is poured into the interior of the extruder for melting and extrusion. The melt is extruded through a ring die, water-cooled, and then drawn to form a flat yarn. The flat yarn is heat-set in a hot oven to eliminate internal stress and obtain a flat yarn body. The extrusion temperature is 240°C, the draw ratio is 1:8, and the temperature of the hot oven is controlled at 110°C. S3: Using a circular loom, the flat yarn is woven into a tubular cloth, which is then coated with a polyvinyl alcohol solution and dried to form a heat-resistant layer. The warp and weft density of the tubular cloth is 14×14 threads / inch; S4: Use heat sealing to make bags, use high temperature resistant ink to print labels, and cut to obtain high temperature resistant polypropylene plastic woven bags.

[0028] Comparing conventional polypropylene plastic woven bags with the polypropylene plastic woven bags prepared in Examples 1 to 5, the polypropylene plastic woven bags prepared in Examples 1 to 5 are shown in the following table:

[0029] Heat resistance: GB / T 17391.

[0030] It can be seen from the above table that the heat resistance and aging resistance of the polypropylene plastic woven bag prepared by the present invention are significantly improved, and embodiment 2 is the best embodiment.

[0031] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A high temperature resistant polypropylene plastic woven bag, characterized in that: The high-temperature resistant polypropylene plastic woven bag includes a woven bag main body and a heat-resistant layer adhered to the surface of the woven bag main body. The raw materials of the woven bag main body are composed of the following components by mass: 80 to 90 parts of homopolypropylene, 3.0 to 5.0 parts of polyethylene, 1.0 to 2.0 parts of additives, 3.0 to 8.0 parts of heat-resistant modifiers and 1.0 to 3.0 parts of additives. The heat-resistant modifiers include nucleating agents, thermal stabilizers and modified titanium dioxide. The additives include modified carbon black, antioxidants and lubricants. The additives include nanoclay and carbon nanotubes. The raw material of the heat-resistant layer is polyvinyl alcohol solution.

2. A high temperature resistant polypropylene plastic woven bag according to claim 1, characterized in that: The weight ratio of the nucleating agent, the thermal stabilizer and the modified titanium dioxide in the heat-resistant modifier is 1:2:25, the nucleating agent is one of a sorbitol nucleating agent and a carboxylate nucleating agent, the sorbitol nucleating agent is Millad 3988, the carboxylate nucleating agent is calcium stearate, the thermal stabilizer is one of a hindered phenol thermal stabilizer and a phosphate thermal stabilizer, the hindered phenol thermal stabilizer is Irganox 1010, and the phosphate thermal stabilizer is Irgafos 168.

3. A high temperature resistant polypropylene plastic woven bag according to claim 1, characterized in that: The raw materials of the modified titanium dioxide include titanium dioxide, phosphate solution, iron salt solution, silane coupling agent and aluminum oxide powder, and the weight ratio of titanium dioxide, phosphate solution, iron salt solution, silane coupling agent and aluminum oxide powder is 10:3:3:

1.

4. A high temperature resistant polypropylene plastic woven bag according to claim 3, characterized in that: The preparation method of the modified titanium dioxide comprises the following steps: titanium dioxide, phosphate, iron salt, silane coupling agent and alumina powder are weighed in proportion; S1: titanium dioxide pretreatment: titanium dioxide is poured into deionized water and ultrasonically treated for 10 to 20 minutes to disperse and form a uniform suspension with a solid content of 10% to 20%, thereby obtaining a titanium dioxide solution; S2: phosphate treatment: the titanium dioxide solution is slowly added to a phosphate solution, the pH is adjusted to 8 to 10, and the reaction is stirred at a temperature of 60° C. to 80° C. for 1 to 2 hours, wherein the phosphate radical reacts with the hydroxyl group on the surface of the titanium dioxide to form a phosphate suspension. Ti-OP bond to improve surface hydrophilicity; S3: Iron salt coprecipitation: Add iron salt solution dropwise to generate a nanolayer-coated titanium dioxide to obtain a primary modified titanium dioxide. After the reaction, adjust the pH to neutral, filter, wash, and dry. S4: Preparation of silane solution: Dissolve silane coupling agent in ethanol at 1-3wt%, adjust the pH to 4-5 with acetic acid, hydrolyze for 30 minutes, add the primary modified titanium dioxide to the silane solution, stir and react at 70℃-80℃ for 3 hours, centrifuge, wash with ethanol, and dry at 80℃ to obtain a secondary modified titanium dioxide. S5: Disperse the secondary modified titanium dioxide in an aluminum salt solution, add ammonia water as a precipitant, react at 80°C to generate Al(OH)3 gel, then calcine at 500-600°C, then add alumina powder and ball mill for 2-4 hours to form composite particles through physical adsorption, and grind to obtain modified titanium dioxide.

5. A high temperature resistant polypropylene plastic woven bag according to claim 1, characterized in that: The weight ratio of modified carbon black, antioxidant and lubricant in the additive is 3:2:

2.

6. A high temperature resistant polypropylene plastic woven bag according to claim 1, characterized in that: The raw materials of the modified carbon black include carbon black, MMA, AIBN and DMF, and the weight ratio of carbon black, MMA, AIBN and DMF is 19:2:1:

12.

7. A high temperature resistant polypropylene plastic woven bag according to claim 6, characterized in that: The preparation method of the modified carbon black comprises the following steps: dispersing carbon black, MMA and AIBN in a solvent DMF, heating to 70-80° C., reacting for 6-12 hours under nitrogen protection, centrifuging and washing to remove ungrafted homopolymers, and obtaining the modified carbon black.

8. A process for preparing a high-temperature resistant polypropylene plastic woven bag as claimed in claim 1, characterized in that: The following steps are involved: S1: Homopolymer polypropylene, polyethylene, additives, heat-resistant modifier and additives are weighed in proportion, and then poured into a high-speed mixer and uniformly mixed to obtain a mixture; S2: The mixed material is poured into the interior of the extruder for melting and extrusion. The melt is extruded through a ring die, water-cooled, and then drawn to form a flat yarn. The flat yarn is heat-set in a hot oven to eliminate internal stress and obtain a flat yarn body. S3: Using a circular loom, the flat yarn is woven into a tubular cloth, which is then coated with a polyvinyl alcohol solution and dried to form a heat-resistant layer; S4: Use heat sealing to make bags, use high temperature resistant ink to print labels, and cut to obtain high temperature resistant polypropylene plastic woven bags.

9. The process for preparing a high temperature resistant polypropylene plastic woven bag according to claim 8, characterized in that: In S2, the extrusion temperature is 200°C-250°C, the draw ratio is 1:6-1:8, and the temperature of the hot oven is controlled at 100°C-120°C.

10. The process for preparing a high temperature resistant polypropylene plastic woven bag according to claim 8, characterized in that: In S3, the warp and weft density of the tubular cloth is 10×10 strands / inch to 14×14 strands / inch.

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