A packing bag for paste polyvinyl chloride resin and a production process thereof

Abstract

The application relates to the technical field of resin packaging bags, and discloses a polyvinyl chloride paste resin packaging bag and a production process thereof. The polyvinyl chloride paste resin packaging bag is composed of three layers, and each layer is made of the following raw materials in the weight fraction: inner lining: 70-80 parts of polypropylene, 10-15 parts of maleic anhydride grafted polypropylene, 5-8 parts of poe elastomer, 3-5 parts of silicon dioxide, 0-0.5 parts of antioxidant, 0-0.5 parts of lubricant, and 1-5 parts of master batch; interlayer: 50-60 parts of polyvinyl chloride paste resin, 8-12 parts of dioctyl phthalate, 2-4 parts of calcium-zinc composite stabilizer, 10-15 parts of calcium carbonate, 5-8 parts of flame retardant, 1-2 parts of coupling agent, and 0.3-0.8 parts of ultraviolet light resistance absorbing agent. The application realizes the high strength, high flame retardance and high weather resistance characteristics which cannot be achieved by traditional packaging bags through the innovative design of 'fiber fusion enhancement + functional interlayer penetration + composite outer layer protection', while keeping the low cost, and perfectly adapts to the strict requirements of high-end fields such as chemical industry, electronics and food.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of resin packaging bags, more particularly to a paste polyvinyl chloride resin packaging bag and a production process thereof. BACKGROUND

[0002] The paste polyvinyl chloride resin packaging bag is a container specially used for packaging paste polyvinyl chloride resin, and usually needs to meet specific requirements for storage, transportation and use of the resin.

[0003] However, the conventional paste polyvinyl chloride resin packaging bag has the following problems in the prior art: low use strength, small use range, and easy generation of static electricity during use, which leads to easy dust adsorption. SUMMARY

[0004] In order to overcome the above-mentioned defects of the prior art, the present application provides a paste polyvinyl chloride resin packaging bag and a production process thereof to solve the problems in the background art.

[0005] The present application provides the following technical solution: a paste polyvinyl chloride resin packaging bag composed of three layers of structures, each layer of structure being made of the following weight fractions of raw materials:

[0006] Inner liner: 70-80 parts of polypropylene, 10-15 parts of maleic anhydride grafted polypropylene, 5-8 parts of poe elastomer, 3-5 parts of silicon dioxide, 0-0.5 parts of antioxidant, 0-0.5 parts of lubricant, and 1-5 parts of masterbatch;

[0007] Interlayer: 50-60 parts of polyvinyl chloride paste resin, 8-12 parts of dioctyl phthalate, 2-4 parts of calcium-zinc composite stabilizer, 10-15 parts of calcium carbonate, 5-8 parts of flame retardant, 1-2 parts of coupling agent, and 0.3-0.8 parts of ultraviolet light absorbing agent;

[0008] Outer layer: 60-70 parts of high-density polyethylene, 15-20 parts of linear low-density polyethylene, 3-6 parts of titanium white powder, 1-2 parts of antistatic agent, 0.5-1 parts of light stabilizer, 0.5-1.5 parts of processing aid, and 2-4 parts of masterbatch.

[0009] Further, after the inner liner is woven into a tube, a pressure light melting operation is required, that is, the inner liner is slightly extruded after being heated at the warp-weft intersection, so as to be lightly fused and connected.

[0010] A production process of a paste polyvinyl chloride resin packaging bag, comprising the following contents:

[0011] S1, inner liner raw material processing: first put the inner liner raw material into the twin screw extruder for melting mixing, after melting mixing, then extrude single wire, cool the extruded single wire by water cooling, after cooling, then collect the inner liner wire;

[0012] S2, wire collecting and weaving: put the collected inner liner wire into a circular weaving machine for weaving, and weave a packaging bag prototype by forming a net structure;

[0013] S3, pressurized shallow melting: the packaging bag prototype is treated by infrared heating roller pressing to locally melt the warp and weft intersection, after pressurized shallow melting, then perform corona treatment, after corona treatment, then perform interlayer treatment:

[0014] S4, interlayer coating preparation: put the interlayer raw material into a planetary mixer for mixing, after mixing, ensure that the mixed material forms a uniform paste, after forming a uniform paste, roll coat the paste on the surface of the packaging bag prototype, ensure that the coating covers the inner liner surface and the gap between the warp and weft, after coating, then perform plasticizing and shaping in a hot air circulating oven;

[0015] S5, outer layer compounding: first perform color printing on the OPP film after corona treatment, dry and reserve, then add ethylene-ethyl acrylate copolymer to the outer layer raw material, then perform synchronous extrusion, after synchronous extrusion, hot press compound the outer layer on the surface of the interlayer coating, after hot press compounding, then compound the printed OPP layer with the outer layer by using hot melt adhesive, after cooling, then perform edge sewing treatment, and seal the edge by using ultrasonic wave;

[0016] S6, inspection: after completing the operation, then perform inspection to check whether the three layers are completely compounded, after confirming compounding, then package and store them in the warehouse.

[0017] Further, the temperature of the twin screw extruder in S1 is controlled at 180-200℃, and the rotation speed is controlled at 200-300rpm, during extrusion, the extrusion temperature is controlled at 210-230℃, and the water cooling temperature for water cooling and shaping is controlled at 20-25℃.

[0018] Further, the porosity of the net substrate in S2 is ≤5%.

[0019] Further, the infrared heating roller pressing in S3 is performed at a temperature of 145-155℃, a pressure of 0.3-0.5MPa, and a time of 6-8 seconds, the warp and weft contact surface melting ratio is 30-40%, during corona treatment, the corona power is 8-10kW, and the surface tension is controlled at ≥42mN / m.

[0020] Further, the temperature of the S4 planetary mixer is 60-70 DEG C, the rotation speed is controlled at 500-800 rpm, the time is controlled at 20-30 minutes, the roller coating is coated with a fixed coating amount controlled at 100-120 g / m2, wherein the temperature of the hot air circulating oven is controlled at 160-180 DEG C, and the time is controlled at 1.5-2 min, so as to ensure that the plasticizing setting degree is greater than or equal to 65%.

[0021] Further, the ethylene-ethyl acrylate copolymer added in S5 is added in an amount of 1-2 parts.

[0022] Technical effects and advantages of the present application:

[0023] 1. The present application realizes high strength, high flame retardance and high weather resistance characteristics which cannot be achieved by traditional packaging bags, while keeping low cost, and perfectly meets the strict requirements of high-end fields such as chemical industry, electronics and food.

[0024] 2. The present application forms a three-dimensional network reinforcing structure by using polypropylene fibers to weave and then pressurizing and shallow melting, and the proportion of fusion points is 30-40%; the fiber pores are filled with interlayer PVC paste, and the mechanical anchoring of "barb shape" is formed after solidification, so as to further increase the strength of the packaging bag.

[0025] 3. The present application adds silica as an anti-sticking particle to the inner lining, and the surface is treated by corona to reduce the surface energy; the interlayer lubricant reduces the molecular adsorption with the paste resin, so that the high-viscosity resin of the packaging can be completely poured out, and material waste is reduced.

[0026] 4. The present application adds ethoxylated alkyl amine antistatic agent to the outer layer to form a conductive network, which can avoid static breakdown when used as electronic component packaging, and does not absorb particles in a dusty environment. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 Table of anti-tearing strength experimental data of the inner lining of the present application.

[0028] Figure 2 Table of anti-puncture force experimental data of the inner lining of the present application.

[0029] Figure 3 Table of anti-flexibility experimental data of the inner lining of the present application.

[0030] Figure 4 Table of anti-adhesion experimental data of the inner lining of the present application.

[0031] Figure 5 Table of strength experimental data of the inner lining of the present application after pressurized shallow melting.

[0032] Figure 6The experimental data table of the interlayer adhesion and porosity of the inner liner after the inner liner is lightly fused under pressure according to the present application.

[0033] Figure 7 The experimental data table of the flame retardation and tensile strength of the interlayer according to the present application.

[0034] Figure 8 The experimental data table of the DOP migration resistance of the interlayer according to the present application.

[0035] Figure 9 The experimental data table of the ultraviolet resistance and processing fluidity of the interlayer according to the present application.

[0036] Figure 10 The process flow chart of the packaging bag according to the present application. DETAILED DESCRIPTION

[0037] The technical solutions in the present application will be described clearly and completely below with reference to the drawings in the present application, and additionally, the forms of each structure described in the following embodiments are only examples, and the paste polyvinyl chloride resin packaging bag and the production process thereof according to the present application are not limited to each structure described in the following embodiments, and all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0038] REFERENCE Figures 1-10 The present application provides a paste polyvinyl chloride resin packaging bag and a production process thereof, wherein the paste polyvinyl chloride resin packaging bag is composed of three layers of structures, and each layer of structure is made of the following weight fractions of each raw material:

[0039] The inner liner is made of the following weight fractions of each raw material: polypropylene 70-80 parts, maleic anhydride grafted polypropylene 10-15 parts, poe elastomer 5-8 parts, silicon dioxide 3-5 parts, antioxidant 0-0.5 parts, lubricant 0-0.5 parts, and masterbatch 1-5 parts;

[0040] The interlayer is made of the following weight fractions of each raw material: polyvinyl chloride paste resin 50-60 parts, dioctyl phthalate 8-12 parts, calcium-zinc composite stabilizer 2-4 parts, calcium carbonate 10-15 parts, flame retardant 5-8 parts, coupling agent 1-2 parts, and ultraviolet light absorption resistant agent 0.3-0.8 parts;

[0041] The outer layer is made of the following weight fractions of each raw material: high-density polyethylene 60-70 parts, linear low-density polyethylene 15-20 parts, titanium white powder 3-6 parts, antistatic agent 1-2 parts, light stabilizer 0.5-1 part, processing aid 0.5-1.5 parts, and masterbatch 2-4 parts.

[0042] The inner liner needs to be lightly fused under pressure after being woven into a tube, that is, the inner liner is lightly fused by slightly extruding the inner liner after the warp and weft intersection of the inner liner is heated.

[0043] A production process of a paste polyvinyl chloride resin packaging bag, comprising the following contents:

[0044] S1, inner liner raw material processing: first put the inner liner raw material into the double screw extruder for melting mixing, then extrude single wire, cool the extruded single wire through water cooling, and then collect the inner liner wire after cooling;

[0045] S2, collecting and weaving the prototype: put the collected inner liner wire into the circular weaving machine for weaving, and weave the packaging bag prototype by forming a net structure;

[0046] S3, pressurized shallow melting: the packaging bag prototype is treated by infrared heating roller pressing to locally melt the warp and weft intersection, and then the layering treatment is carried out after the pressurized shallow melting is completed, and then the layering treatment is carried out after the corona treatment is completed:

[0047] S4, making sandwich coating: put the sandwich raw material into the planetary mixer for mixing, ensure that the mixed material forms a uniform paste after mixing, and then roll the paste on the surface of the packaging bag prototype to ensure that the coating covers the inner liner surface and the gap between the warp and weft, and then plasticize and shape in the hot air circulation oven;

[0048] S5, outer layer composite: first, the OPP film is treated by corona treatment and color printing, and then dried for standby, then the outer layer raw material is added with ethylene-acrylic acid ethyl ester copolymer, and then extruded synchronously, then hot-pressed on the surface of the sandwich coating, then the printed OPP layer and the outer layer are compounded by using hot melt adhesive, and then cooled, then the edge is treated by ultrasonic sealing;

[0049] S6, inspection: after the operation is completed, the three-layer composite is inspected, and then packaged and stored after the composite is confirmed.

[0050] The double screw extruder in S1 is controlled at a temperature of 180-200°C, and the rotation speed is controlled at 200-300 rpm, the extrusion temperature is controlled at 210-230°C during extrusion, and the water cooling temperature of water cooling setting is 20-25°C.

[0051] The porosity of the net substrate in S2 is ≤5%.

[0052] The infrared heating roller pressing in S3 is used at a temperature of 145-155°C, a pressure of 0.3-0.5 MPa, a time of 6-8 seconds, a warp-weft contact surface melting ratio of 30%-40%, a corona treatment power of 8-10 kW, and a surface tension control of ≥42 mN / m.

[0053] The temperature of the planetary mixer in S4 is 60-70℃, the rotating speed is controlled at 500-800rpm, the time is controlled at 20-30 minutes, the fixed coating amount of roller coating is controlled at 100-120g / m2, the temperature of the hot air circulation oven is controlled at 160-180℃, and the time is controlled at 1.5-2 minutes, and the plasticization setting degree is ≥65%.

[0054] The added ethylene-ethyl acrylate copolymer in S5 is 1-2 parts.

[0055] The inner liner raw material in S1 is polypropylene 70-80 parts, maleic anhydride grafted polypropylene 10-15 parts, poe elastomer 5-8 parts, silicon dioxide 3-5 parts, antioxidant 0-0.5 parts, lubricant 0-0.5 parts, and master batch 1-5 parts.

[0056] The optimal ratio of the inner liner raw material is determined by setting multiple control groups.

[0057] Control group 1: The inner liner raw material is polypropylene 70 parts, maleic anhydride grafted polypropylene 10 parts, poe elastomer 5 parts, silicon dioxide 3 parts, antioxidant 0 parts, lubricant 0 parts, and master batch 1 part.

[0058] Control group 2: The inner liner raw material is polypropylene 75 parts, maleic anhydride grafted polypropylene 11 parts, poe elastomer 6 parts, silicon dioxide 4 parts, antioxidant 0.3 parts, lubricant 0.3 parts, and master batch 2 parts.

[0059] Control group 3: The inner liner raw material is polypropylene 80 parts, maleic anhydride grafted polypropylene 12 parts, poe elastomer 7 parts, silicon dioxide 5 parts, antioxidant 0.5 parts, lubricant 0.5 parts, and master batch 3 parts.

[0060] Control group 4: The inner liner raw material is polypropylene 70 parts, maleic anhydride grafted polypropylene 13 parts, poe elastomer 8 parts, silicon dioxide 3 parts, antioxidant 0.1 parts, lubricant 0.1 parts, and master batch 4 parts.

[0061] Control group 5: The inner liner raw material is polypropylene 75 parts, maleic anhydride grafted polypropylene 14 parts, poe elastomer 5 parts, silicon dioxide 3 parts, antioxidant 0.2 parts, lubricant 0.2 parts, and master batch 5 parts.

[0062] Control group 6: The inner liner raw material is polypropylene 80 parts, maleic anhydride grafted polypropylene 15 parts, poe elastomer 6 parts, silicon dioxide 4 parts, antioxidant 0.3 parts, lubricant 0.3 parts, and master batch 2 parts.

[0063] Control group 7: inner lining raw material, using polypropylene 70 parts, maleic anhydride grafted polypropylene 12 parts, poe elastomer 7 parts, silicon dioxide 5 parts, antioxidant 0.4 parts, lubricant 0.4 parts, master batch 3 parts;

[0064] Control group 8: inner lining raw material, using polypropylene 75 parts, maleic anhydride grafted polypropylene 14 parts, poe elastomer 8 parts, silicon dioxide 4 parts, antioxidant 0.5 parts, lubricant 0.5 parts, master batch 4 parts;

[0065] Control group 9: inner lining raw material, using polypropylene 80 parts, maleic anhydride grafted polypropylene 15 parts, poe elastomer 6 parts, silicon dioxide 5 parts, antioxidant 0.3 parts, lubricant 0.3 parts, master batch 5 parts;

[0066] A plurality of sets of control group data are set to test the strength data of the inner lining:

[0067]

[0068] From the above, it can be seen that the inner lining raw material of control group 2 uses polypropylene 75 parts, maleic anhydride grafted polypropylene 11 parts, poe elastomer 6 parts, silicon dioxide 4 parts, antioxidant 0.3 parts, lubricant 0.3 parts, and master batch 2 parts, which has the best comprehensive performance, has a tear strength of 75.6 N / mm, a bending flexibility of 1500 times without breaking, a paste value residue of 1.2 g / ㎡, which is better than the industry standard, and a melt flow rate of 8.5 g / 10 min, which is suitable for subsequent wire drawing and weaving.

[0069] The pressurized shallow melting described in S3: by using infrared heating roller to process the packaging bag prototype, local melting is generated at the intersection of warp and weft, then the packaging bag prototype is subjected to corona treatment after the pressurized shallow melting, and then subjected to interlayer treatment, using infrared heating roller, temperature is 145℃-155℃, pressure is 0.3MPa-0.5MPa, time is 6-8 seconds, the melting ratio of warp and weft contact surface is 30%-40%, the corona treatment power is 8kW-10kW, and the surface tension is controlled to be greater than or equal to 42mN / m;

[0070] A plurality of experiments are set to detect the effect of pressurized shallow melting on the strength of the packaging bag prototype:

[0071] Control group: without using pressurized shallow melting, the packaging bag prototype is directly used for testing as a control group;

[0072] Experimental group 1: using infrared heating roller, temperature is 145℃-155℃, pressure is 0.3MPaMPa, time is 6 seconds;

[0073] Experimental group 2: using infrared heating roll pressing, the temperature is 150℃, the pressure is 0.4MPa, the time is 7 seconds;

[0074] Experimental group 3: using infrared heating roll pressing, the temperature is 155℃, the pressure is 0.5MPa, the time is 8 seconds;

[0075] Experimental group 4: using infrared heating roll pressing, the temperature is 145℃, the pressure is 0.4MPa, the time is 6 seconds;

[0076] Experimental group 5: using infrared heating roll pressing, the temperature is 150℃, the pressure is 0.4MPa, the time is 7 seconds;

[0077] A plurality of experimental data is set to test the strength data of the liner:

[0078]

[0079] From the above, it can be seen that the porosity of the control group without pressure and shallow melting is as high as 8.2%, the tear resistance is 58.2N / mm, and the puncture resistance is 76.5N, which is significantly lower than all experimental groups. It can be seen that the liner strength without using the pressure and shallow melting technology is poor, and the use of the pressure and shallow melting technology makes the porosity of the liner packaging bag prototype as low as 3.2-6.5%, the tear resistance is increased by 18-41%, and the puncture resistance is increased by 17-42%. It can be seen that the strength of the liner using the pressure and shallow melting technology is greatly improved;

[0080] From the above, it can be seen that the data of experimental group 3 can be obtained.

[0081] The interlayer coating of S4 is made by putting the interlayer raw materials into a planetary mixer for mixing. After mixing, the mixed material forms a uniform paste. The paste is then rolled and coated on the surface of the packaging bag prototype to ensure that the coating covers the surface of the liner and the warp and weft gaps. After coating, the material is plasticized and shaped in a hot air circulating oven. The interlayer material uses polyvinyl chloride paste resin 50-60 parts, dioctyl phthalate 8-12 parts, calcium-zinc composite stabilizer 2-4 parts, calcium carbonate 10-15 parts, flame retardant 5-8 parts, coupling agent 1-2 parts, and ultraviolet light absorbing agent 0.3-0.8 parts;

[0082] A plurality of control groups are set to determine the optimal ratio of interlayer raw materials:

[0083] Control group 1: the interlayer material uses polyvinyl chloride paste resin 50 parts, dioctyl phthalate 8 parts, calcium-zinc composite stabilizer 2 parts, calcium carbonate 10 parts, flame retardant 5 parts, coupling agent 1 part, and ultraviolet light absorbing agent 0.3 parts;

[0084] Control group 2: the interlayer material uses polyvinyl chloride paste resin 55 parts, dioctyl phthalate 10 parts, calcium zinc composite stabilizer 3 parts, calcium carbonate 11 parts, flame retardant 6 parts, coupling agent 1.5 parts, ultraviolet light absorbing agent 0.5 parts;

[0085] Control group 3: the interlayer material uses polyvinyl chloride paste resin 60 parts, dioctyl phthalate 12 parts, calcium zinc composite stabilizer 4 parts, calcium carbonate 12 parts, flame retardant 7 parts, coupling agent 2 parts, ultraviolet light absorbing agent 0.8 parts;

[0086] Control group 4: the interlayer material uses polyvinyl chloride paste resin 50 parts, dioctyl phthalate 10 parts, calcium zinc composite stabilizer 4 parts, calcium carbonate 13 parts, flame retardant 8 parts, coupling agent 1 part, ultraviolet light absorbing agent 0.3 parts;

[0087] Control group 5: the interlayer material uses polyvinyl chloride paste resin 55 parts, dioctyl phthalate 12 parts, calcium zinc composite stabilizer 3 parts, calcium carbonate 14 parts, flame retardant 8 parts, coupling agent 2 parts, ultraviolet light absorbing agent 0.5 parts;

[0088] Control group 6: the interlayer material uses polyvinyl chloride paste resin 60 parts, dioctyl phthalate 8 parts, calcium zinc composite stabilizer 2 parts, calcium carbonate 15 parts, flame retardant 7 parts, coupling agent 2 parts, ultraviolet light absorbing agent 0.8 parts;

[0089] Control group 7: the interlayer material uses polyvinyl chloride paste resin 50 parts, dioctyl phthalate 12 parts, calcium zinc composite stabilizer 3 parts, calcium carbonate 15 parts, flame retardant 6 parts, coupling agent 1 part, ultraviolet light absorbing agent 0.8 parts;

[0090] Control group 8: the interlayer material uses polyvinyl chloride paste resin 55 parts, dioctyl phthalate 8-12 parts, calcium zinc composite stabilizer 4 parts, calcium carbonate 12 parts, flame retardant 5 parts, coupling agent 1 part, ultraviolet light absorbing agent 0.5 parts;

[0091] Control group 9: the interlayer material uses polyvinyl chloride paste resin 60 parts, dioctyl phthalate 8-12 parts, calcium zinc composite stabilizer 3 parts, calcium carbonate 10 parts, flame retardant 8 parts, coupling agent 2 parts, ultraviolet light absorbing agent 0.3 parts;

[0092] A plurality of experimental data are set to test the influence of the interlayer material ratio on the subsequent packaging bag strength data:

[0093]

[0094]

[0095] In summary, it can be known that the comprehensive performance of the control group 2 is the best, which balances the flame retardancy, chemical resistance, processing fluidity and cost efficiency, and at the same time, through the suitable processing fluidity, it ensures that the interlayer material can fill the woven pores of the inner liner when the inner liner is coated after being pressed and shallowly melted, so as to improve the service strength of the finished inner liner, mainly because the paste of the control group 2 has moderate thixotropy, which can flow to fill the pores during roller coating, so that the porosity is ≤5%, and at the same time, the over-thin paste will not cause sagging, and the nano calcium carbonate modified by the coupling agent, i.e. silane KH-550, can form micro-channels in the PVC matrix, so that the paste is more easily penetrated into the fiber gap, the inverted hook-shaped solidification structure of the plasticized PVC in the pores forms physical anchoring with the polypropylene fibers at the welding points, so that the interlayer peeling strength is improved, and the rigid particles of the nano calcium carbonate can disperse the local stress when the inner liner is stressed, so that the puncture resistance is improved from 98.7N of the simple weaving to 118.4N after coating.

[0096] The S5, outer layer composite: first, the OPP film is treated by corona and then color printing is performed, and after drying, it is ready for use. At this time, the outer layer raw material is added with ethylene-ethyl acrylate copolymer, and then it is synchronously extruded. After synchronous extrusion, it is hot-pressed and compounded on the surface of the interlayer coating. After hot-pressing and compounding, at this time, the printed OPP layer is compounded with the outer layer by using hot melt adhesive. After cooling, at this time, the edge sealing treatment is performed, and the edge sealing treatment is performed by using ultrasonic wave. The outer layer uses high-density polyethylene 60-70 parts, linear low-density polyethylene 15-20 parts, titanium dioxide 3-6 parts, antistatic agent 1-2 parts, light stabilizer 0.5-1 part, processing aid 0.5-1.5 part, and master batch 2-4 parts.

[0097] The optimal ratio of the outer layer raw material is determined by setting multiple control groups:

[0098] Control group 1: high-density polyethylene 60 parts, linear low-density polyethylene 15 parts, titanium dioxide 3 parts, antistatic agent 1 part, light stabilizer 0.5 part, processing aid 0.5 part, and master batch 2 parts.

[0099] Control group 2: high-density polyethylene 65 parts, linear low-density polyethylene 17.5 parts, titanium dioxide 4 parts, antistatic agent 1.5 parts, light stabilizer 0.75 part, processing aid 1 part, and master batch 3 parts.

[0100] Control group 3: high-density polyethylene 70 parts, linear low-density polyethylene 20 parts, titanium dioxide 5 parts, antistatic agent 2 parts, light stabilizer 1 part, processing aid 1.5 parts, and master batch 4 parts.

[0101] Control group 4: high-density polyethylene 60 parts, linear low-density polyethylene 20 parts, titanium dioxide 6 parts, antistatic agent 2 parts, light stabilizer 1 part, processing aid 1.5 parts, and master batch 4 parts.

[0102] Control group 5: high density polyethylene 65 parts, linear low density polyethylene 20 parts, titanium dioxide 6 parts, antistatic agent 3 parts, light stabilizer 1 part, processing aid 1.5 parts, master batch 4 parts;

[0103] Control group 6: high density polyethylene 70 parts, linear low density polyethylene 15 parts, titanium dioxide 3 parts, antistatic agent 1 part, light stabilizer 0.5 parts, processing aid 0.5 parts, master batch 2 parts;

[0104] Control group 7: high density polyethylene 70 parts, linear low density polyethylene 17.5 parts, titanium dioxide 5 parts, antistatic agent 1 part, light stabilizer 0.75 parts, processing aid 1 part, master batch 3 parts;

[0105] Control group 8: high density polyethylene 65 parts, linear low density polyethylene 15 parts, titanium dioxide 3 parts, antistatic agent 1 part, light stabilizer 0.5 parts, processing aid 0.5 parts, master batch 2 parts;

[0106] Control group 9: high density polyethylene 60 parts, linear low density polyethylene 17.5 parts, titanium dioxide 4 parts, antistatic agent 2 parts, light stabilizer 0.75 parts, processing aid 0.75 parts, master batch 3 parts;

[0107] The multiple sets of experimental data are set to test the influence of the outer layer material ratio on the subsequent packaging bag strength data:

[0108]

[0109] In summary, it can be known that the control group 2 is the most optimal, which is the most balanced data, and the cost is low when used, and it is also the most balanced in actual use, which has antistatic, high flexibility, strong impact resistance, forms a conductive network by adding ethoxylated alkyl amine antistatic agent to the outer layer, can avoid static breakdown when used as electronic component packaging, and does not adsorb particles in a dusty environment

[0110] In summary, the packaging bag with a three-layer structure has excellent performance, has high porosity compared to traditional woven bags, and the interlayer material is easy to leak, and the inner lining is fused by 30-40% to reduce the porosity, and maleic anhydride grafted polypropylene is added to enhance the interfacial compatibility, so that the interlayer paste permeability is improved, the inner lining is blended with maleic anhydride grafted polypropylene (MAH-PP) and POE elastomer, combined with silica reinforcement and shallow fusion process, a unique fusion network structure is formed, the interlayer penetrates into the inner lining porosity by roller coating process, fills the gap and forms physical anchoring, the outer layer uses ethylene-ethyl acrylate copolymer (EEA) modified HDPE / LLDPE, combined with OPP printing layer, has antistatic, weather resistance and aesthetic appearance.

[0111] Finally, it should be noted that in the description of the present application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be broadly understood, which can be mechanical connection or electrical connection, or the internal communication of two elements, or direct connection, "up", "down", "left", "right" and the like are only used to indicate the relative positional relationship, when the absolute position of the described object changes, the relative positional relationship may change;

[0112] Secondly: the drawings of the disclosed embodiments of the application only involve the structures involved in the disclosed embodiments, other structures can refer to the usual design, and in the case of no conflict, the same embodiment and different embodiments of the application can be combined with each other;

[0113] Finally: the above only describes the preferred embodiments of the application and is not used to limit the application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A packing bag for paste polyvinyl chloride resin, characterized by: It is composed of three layers, each layer is made of the following weight parts of each raw material: Inner liner: polypropylene 70-80 parts, maleic anhydride grafted polypropylene 10-15 parts, poe elastomer 5-8 parts, silicon dioxide 3-5 parts, antioxidant 0-0.5 parts, lubricant 0-0.5 parts, masterbatch 1-5 parts; Interlayer: polyvinyl chloride paste resin 50-60 parts, dioctyl phthalate 8-12 parts, calcium-zinc composite stabilizer 2-4 parts, calcium carbonate 10-15 parts, flame retardant 5-8 parts, coupling agent 1-2 parts, ultraviolet light absorbing agent 0.3-0.8 parts; Outer layer: high density polyethylene 60-70 parts, linear low density polyethylene 15-20 parts, titanium dioxide 3-6 parts, antistatic agent 1-2 parts, light stabilizer 0.5-1 parts, processing aid 0.5-1.5 parts, masterbatch 2-4 parts; After the inner liner is woven into a tube, pressure and shallow melting are carried out, that is, after the inner liner is heated at the intersection of warp and weft, the inner liner is slightly extruded to make the inner liner warp and weft shallowly melt and connect, the heating temperature is 145-155 DEG C, the pressure is 0.3-0.5 MPa, the intersection of warp and weft locally melts, and the melting ratio of the contact surface of warp and weft is 30-40%.

2. The process for producing a packing bag of paste polyvinyl chloride resin according to claim 1, characterized by: It includes the following contents: S1, inner liner raw material treatment: first, the inner liner raw material is put into a double screw extruder for melting and mixing, then the extruded single wire is cooled by water cooling, and then the inner liner wire is collected; S2, collecting and weaving the rough shape: the collected inner liner wire is put into a circular weaving machine to weave the rough shape of the packaging bag by forming a net structure; S3, pressurized shallow melting: the rough shape of the packaging bag is treated by infrared heating roller pressing to make the intersection of warp and weft locally melt, and then the rough shape of the packaging bag is treated by corona treatment after the pressurized shallow melting is completed, and then the interlayer is treated; S4, interlayer coating preparation: the interlayer raw material is put into a planetary mixer for mixing, and then the mixed material is formed into a uniform paste, the paste is rolled on the surface of the packaging bag rough shape to ensure that the coating covers the inner liner surface and the gap between the warp and weft, and the paste is plasticized and shaped in a hot air circulating oven after the coating is completed; S5, outer layer composite: first, the OPP film is treated by corona treatment and then printed, and then dried for standby, the outer layer raw material is added with ethylene-acrylic acid ethyl ester copolymer, and then extruded synchronously, the extruded material is hot pressed on the surface of the interlayer coating, the printed OPP layer and the outer layer are combined by using hot melt adhesive after the hot pressing is completed, and then the edge is treated by ultrasonic sealing after the material is cooled; S6, inspection: after the operation is completed, the three-layer composite is inspected, and then packaged and stored in the warehouse after the composite is confirmed.

3. The process for producing a packing bag of paste polyvinyl chloride resin according to claim 2, characterized in that: The temperature of the double screw extruder in S1 is controlled at 180-200 DEG C, and the rotating speed is controlled at 200-300 rpm, the extrusion temperature is controlled at 210-230 DEG C during the extrusion operation, and the water cooling temperature of the water cooling shaping is 20-25 DEG C.

4. The process for producing a packing bag of paste polyvinyl chloride resin according to claim 3, characterized in that: The porosity of the reticular base material of S2 is ≤5%.

5. The process for producing a packing bag of paste polyvinyl chloride resin according to claim 4, characterized in that: The infrared heating roller pressing treatment in S3 is 6-8 seconds, the corona treatment is 8kW-10kW, and the surface tension is controlled to be ≥42mN / m.

6. The process for producing a packing bag of paste polyvinyl chloride resin according to claim 3, characterized by: The temperature of the planetary mixer in S4 is 60-70℃, the rotation speed is controlled to be 500-800rpm, the time is controlled to be 20-30 minutes, the roller coating is controlled to be 100-120g / ㎡, the temperature of the hot air circulation oven is controlled to be 160-180℃, the time is controlled to be 1.5-2 minutes, and the plasticization degree is ≥65%.

7. The process for producing a packing bag of paste polyvinyl chloride resin according to claim 3, characterized by: The added ethylene-ethyl acrylate copolymer in S5 is 1-2 parts.

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