High-specific-gravity polypropylene filling master batch and preparation method thereof

Abstract

The invention belongs to the technical field of plastic filling modification, and discloses a high-specific-gravity polypropylene filling master batch and a preparation method thereof. The high-specific-gravity polypropylene filled master batch is mainly prepared from the following raw materials in parts by mass: 8-28 parts of polypropylene, 70-92 parts of modified barium sulfate powder, 1-4 parts of a lubricant, 4-8 parts of a titanate coupling agent, 3-6 parts of zinc stearate and 0.5-2 parts of an antioxidant. The barium sulfate powder subjected to surface modification treatment is added into the polypropylene master batch, so that the polypropylene master batch has very high specific gravity and can be filled and modified in various high polymer material products with specific gravity requirements.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plastic filling modification, in particular to a high specific gravity polypropylene filling master batch and a preparation method thereof. BACKGROUND

[0002] Polypropylene is the second largest plastic variety next to polyethylene in yield, and has become the fastest growing plastic variety in the history of general thermoplastic plastics. Because polypropylene has excellent comprehensive performance and relatively low price, and is easy to modify, therefore, new polypropylene modified materials emerge in an endless stream and are widely used in the fields of automobiles, household appliances, industrial parts, buildings and the like. Lightweight is a direction of plastic development, and having a high specific gravity to achieve better application prospect is also a direction of plastic development. SUMMARY

[0003] The purpose of the present application is to provide a high specific gravity polypropylene filling master batch and a preparation method thereof, which can broaden the application field of the polypropylene filling master batch and fill and modify various high molecular material products having a demand for specific gravity.

[0004] In order to achieve the above-mentioned purpose of the application, the present application provides the following technical scheme: The present application provides a high specific gravity polypropylene filling master batch, which is prepared from the following raw materials by mass fraction: 8-28 parts of polypropylene, 70-92 parts of modified barium sulfate powder, 1-4 parts of lubricant, 4-8 parts of titanate coupling agent, 3-6 parts of zinc stearate and 0.5-2 parts of antioxidant.

[0005] Preferably, in the high specific gravity polypropylene filling master batch, the preparation method of the modified barium sulfate powder comprises the following steps: The barite is mixed with a grinding aid, and is ground to obtain barium sulfate powder; The barium sulfate powder is mixed with a surface modifier, and is surface modified to obtain modified barium sulfate powder.

[0006] Preferably, in the high specific gravity polypropylene filling master batch, in the preparation method of the modified barium sulfate powder, the grinding aid comprises a mixture of sodium polyacrylate and triethanolamine, the mass ratio of the sodium polyacrylate to the triethanolamine is 1-3:1, and the mass ratio of the grinding aid to the barite is 5-7:1000.

[0007] Preferably, in the high specific gravity polypropylene filling master batch, in the preparation method of the modified barium sulfate powder, the surface modifier comprises a silane coupling agent, the silane coupling agent comprises one or more of γ- diethylene triamine propyl trimethoxysilane, γ-aminopropyl methyl dimethoxysilane, γ-aminopropyl trimethoxysilane, γ-aminopropyl methyl diethoxysilane, γ-aminopropyl triethoxysilane and γ-diethyl aminomethyl triethoxysilane; the mass ratio of the surface modifier to the barium sulfate powder is 8-15:1000.

[0008] Preferably, in the high specific gravity polypropylene filling master batch, in the preparation method of the modified barium sulfate powder, the particle size of the barium sulfate powder is 4-6 μm, and the surface coating rate of the modified barium sulfate powder is ≥97%.

[0009] Preferably, in the high specific gravity polypropylene filling master batch, the polypropylene comprises one or more of homopolymer polypropylene, copolymer polypropylene and random copolymer polypropylene.

[0010] Preferably, in the high specific gravity polypropylene filling master batch, the lubricant comprises one or more of polyethylene wax, oxidized polyethylene wax, polypropylene wax, stearic acid and solid paraffin; the titanate coupling agent comprises one or more of isopropoxy tristearate titanate, isopropoxy tris(dioctyl phosphate) titanate, bis(dioctyl pyrophosphoryl oxy) ethylene titanate, diisostearyl titanate ethylene, isopropyl trioleate titanate; the antioxidant comprises one or more of antioxidant 1010, antioxidant 1076 and antioxidant 168.

[0011] The application further provides a preparation method of a high specific gravity polypropylene filling master batch, comprising the following steps: The polypropylene, the modified barium sulfate powder, the lubricant, the titanate coupling agent, the zinc stearate and the antioxidant are mixed and melt-extruded to obtain the high specific gravity polypropylene filling master batch.

[0012] Preferably, in the preparation method, the mixing conditions comprise a temperature of 160-210 ℃, a rotation speed of 1800-2500 rpm and a time of 10-15 min.

[0013] Preferably, in the preparation method, the melt-extrusion conditions comprise a feeding speed of 26-32 rpm, a temperature of 145-220 ℃ and a screw rotation speed of 250-350 rpm.

[0014] According to the above technical solution, compared with the prior art, the application has the following beneficial effects: Barium sulfate is a white amorphous inorganic powder, with a specific gravity of 4.3~4.7, high whiteness, high gloss, strong chemical inertness, acid and alkali resistance, good stability and the ability to absorb harmful rays, etc. Especially its unique high specific gravity characteristics, it is the most ideal and most promising weighting filler. The present application selects barium sulfate powder as the modified material of polypropylene masterbatch to prepare a high specific gravity polypropylene filling masterbatch. The surface modifier is used to modify the barium sulfate powder in the present application, which can coat the surface modifier on the barium sulfate, reduce the surface energy of the barium sulfate, reduce the polarity between the barium sulfate and the high molecular resin, promote the compatibility, reduce the oil absorption value, improve the processing fluidity and dispersibility. At the same time, the present application also adds lubricant, titanate coupling agent, zinc stearate and antioxidant to the polypropylene masterbatch. The lubricant can play a lubricating role in the material system during processing, improve the material mixing and processing fluidity; the titanate coupling agent can improve the compatibility between the materials; the zinc stearate can improve the internal lubrication and thermal stability; the antioxidant can prevent the material from being oxidized and decomposed during processing and later period. The polypropylene masterbatch prepared by adding the surface modified barium sulfate powder has very high specific gravity, which can be filled and modified in various high molecular material products with the demand for specific gravity, such as sound, curtain, household appliance base, industrial parts and other products. DETAILED DESCRIPTION

[0015] The present application provides a high specific gravity polypropylene filling masterbatch, which is prepared from the following raw materials by mass fraction: Polypropylene 8~28 parts, modified barium sulfate powder 70~92 parts, lubricant 1~4 parts, titanate coupling agent 4~8 parts, zinc stearate 3~6 parts, antioxidant 0.5~2 parts.

[0016] In the present application, the polypropylene preferably includes one or more of homopolymer polypropylene, copolymer polypropylene and random copolymer polypropylene, further preferably includes homopolymer polypropylene, copolymer polypropylene or random copolymer polypropylene, and more preferably includes copolymer polypropylene.

[0017] In the present application, the source of the homopolymer polypropylene, the copolymer polypropylene and the random copolymer polypropylene is not limited, and the commercially available products or preparation methods known to those skilled in the art are used. The grade of the copolymer polypropylene preferably includes EPS30R, P340, K1003, F800E or K9920; the grade of the random copolymer polypropylene preferably includes B8101.

[0018] In the present application, the mass fraction of the polypropylene is preferably 10~24 parts, further preferably 14~20 parts, and more preferably 18 parts.

[0019] In the present application, the preparation method of the modified barium sulfate powder preferably includes the following steps: Mixing barium sulfate with grinding aids, grinding to obtain barium sulfate powder; Mixing the barium sulfate powder with surface modifiers, surface modification to obtain modified barium sulfate powder.

[0020] In the application, the barium sulfate content of the barite is preferably ≥95%.

[0021] In the application, the barite is preferably subjected to coarse crushing, washing and crushing before mixing.

[0022] In the application, the conditions for the coarse crushing, washing and crushing are not limited, and the solutions well known to those skilled in the art can be used.

[0023] In the application, the diameter of the barite subjected to coarse crushing, washing and crushing is preferably 5-10mm.

[0024] In the application, in the preparation method of the modified barium sulfate powder, the grinding aids preferably include a mixture of sodium polyacrylate and triethanolamine.

[0025] In the application, the molecular weight of the sodium polyacrylate is preferably 2.5-3.5 million, further preferably 2.8-3.2 million, and more preferably 2.9-3.1 million.

[0026] In the application, the mass ratio of the sodium polyacrylate to the triethanolamine is preferably 1-3:1, further preferably 1.5-2.5:1, and more preferably 2:1.

[0027] In the application, the mass ratio of the grinding aids to the barite is preferably 5-7:1000, further preferably 6-7:1000, and more preferably 7:1000.

[0028] In the application, the conditions for the grinding include: the rotation speed is preferably 2600-2800r / min, further preferably 2700-2800r / min, and more preferably 2800r / min; and the time is preferably 20-40min, further preferably 25-35min, and more preferably 30min.

[0029] In the application, in the preparation method of the modified barium sulfate powder, the particle size of the barium sulfate powder is preferably 4-6μm, further preferably 4.5-5.5μm, and more preferably 5μm.

[0030] In the application, in the preparation method of the modified barium sulfate powder, the surface modifier includes a silane coupling agent.

[0031] In the present application, the silane coupling agent preferably comprises one or more of γ- diethylenetriaminopropyltrimethoxysilane, γ-aminopropylmethyldimethoxysilane, γ- aminopropyltrimethoxysilane, γ-aminopropylmethyldiethoxysilane, γ- aminopropyltriethoxysilane and γ-diethylaminomethyltriethoxysilane, further preferably comprises γ-diethylenetriaminopropyltrimethoxysilane, γ- aminopropylmethyldimethoxysilane, γ-aminopropyltrimethoxysilane, γ- aminopropylmethyldiethoxysilane, γ-aminopropyltriethoxysilane or γ- diethylaminomethyltriethoxysilane, and more preferably comprises γ- diethylenetriaminopropyltrimethoxysilane or γ-diethylaminomethyltriethoxysilane.

[0032] In the present application, the mass ratio of the surface modifier to the barium sulfate powder is preferably 8-15:1000, further preferably 10-15:1000, and more preferably 13:1000.

[0033] In the present application, the surface modification conditions include that the temperature is preferably 80-120℃, further preferably 90-110℃, and more preferably 95℃; and the time is preferably 10-20min, further preferably 12-18min, and more preferably 15min.

[0034] In the present application, in the preparation method of the modified barium sulfate powder, the surface coating rate of the modified barium sulfate powder is preferably ≥97%.

[0035] In the present application, the mass fraction of the modified barium sulfate powder is preferably 75-92 parts, further preferably 86-92 parts, and more preferably 90 parts.

[0036] In the present application, the lubricant preferably comprises one or more of polyethylene wax, oxidized polyethylene wax, polypropylene wax, stearic acid and solid paraffin, further preferably comprises polyethylene wax, oxidized polyethylene wax, polypropylene wax, stearic acid or solid paraffin, and more preferably comprises polyethylene wax or polypropylene wax.

[0037] In the present application, the source of the polyethylene wax, the oxidized polyethylene wax, the polypropylene wax and the solid paraffin is not limited, and commercially available products or preparation methods known to those skilled in the art are used.

[0038] In the present application, the mass fraction of the lubricant is preferably 2-4 parts, further preferably 3-4 parts, and more preferably 4 parts.

[0039] In the present application, the titanate coupling agent preferably comprises one or more of isopropyl tri-stearate acyloxy titanate, isopropyl tri-(dioctyl phosphate) titanate, bis-(dioctyl pyrophosphato acyloxy) ethylene titanate, diisostearyl titanate ethylene glycol, isopropyl tri-oleate acyloxy titanate, further preferably comprises isopropyl tri-stearate acyloxy titanate, isopropyl tri-(dioctyl phosphate) titanate, bis-(dioctyl pyrophosphato acyloxy) ethylene titanate or diisostearyl titanate ethylene glycol, and more preferably isopropyl tri-stearate acyloxy titanate.

[0040] In the present application, the mass fraction of the titanate coupling agent is preferably 4-7 parts, further preferably 6-7 parts, and more preferably 7 parts.

[0041] In the present application, the mass fraction of the zinc stearate is preferably 4-6 parts, further preferably 5-6 parts, and more preferably 5 parts.

[0042] In the present application, the antioxidant preferably comprises one or more of antioxidant 1010, antioxidant 1076 and antioxidant 168, further preferably comprises antioxidant 1010, antioxidant 1076 or antioxidant 168, and more preferably comprises antioxidant 1010.

[0043] In the present application, the mass fraction of the antioxidant is preferably 1-1.8 parts, further preferably 1.5-1.8 parts, and more preferably 1.8 parts.

[0044] In the present application, when the polypropylene, the lubricant, the titanate coupling agent or the antioxidant preferably comprises a plurality of kinds, the present application does not limit the mass ratio between various kinds, and a solution well known to those skilled in the art can be used.

[0045] The present application also provides a preparation method of high specific gravity polypropylene filling master batch, comprising the following steps: The polypropylene, modified barium sulfate powder, lubricant, titanate coupling agent, zinc stearate and antioxidant are mixed and melt extruded to obtain the high specific gravity polypropylene filling master batch.

[0046] In the present application, the mixing mode of the polypropylene, modified barium sulfate powder, lubricant, titanate coupling agent, zinc stearate and antioxidant is preferably as follows: the modified barium sulfate powder is mixed with the titanate coupling agent, and then the polypropylene, lubricant, zinc stearate and antioxidant are added and mixed.

[0047] In the present application, the mixing conditions include: temperature preferably 160-210℃, further preferably 160-180℃, more preferably 160℃; rotation speed preferably 1800-2500rpm, further preferably 1800-2000, 2200-2500rpm, more preferably 1800, 2500rpm; time preferably 10-15min, further preferably 11-14min, more preferably 13min.

[0048] In the present application, the melt extrusion conditions include: feeding speed preferably 26-32rpm, further preferably 28-30rpm, more preferably 28rpm; temperature preferably 145-220℃, further preferably 145-155℃, 160-170℃, 180-185℃, 190-195℃, 200-203℃, 205-208℃, 210-215℃, 218-220℃, more preferably 145℃, 160℃, 180℃, 190℃, 200℃, 205℃, 210℃, 220℃; screw rotation speed preferably 250-350rpm, further preferably 280-320rpm, more preferably 300rpm.

[0049] In the present application, the melt extrusion device is preferably a double screw extruder.

[0050] In the present application, the length-diameter ratio of the double screw extruder is preferably 48-52, further preferably 49-51, more preferably 50.

[0051] In the present application, after the melt extrusion, preferably further includes: air cooling, granulation.

[0052] In the present application, the conditions for the air cooling and the granulation are not limited, and the solutions well known to those skilled in the art can be adopted.

[0053] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application.

[0054] Embodiment 1

[0055] The present embodiment provides a preparation method of high specific gravity polypropylene filling master batch, comprising the following steps: (1) The high-quality barite ore (sulfate content of 95%, manufacturer Jiangxi Guangyuan Chemical Industry Co., Ltd., model GS-2) is subjected to coarse crushing, washing, and crushing to obtain barite with a diameter of 8 mm. A ball mill is used to grind and classify the barite, and 5 ‰ of the mass of the barite of polyacrylic acid sodium and triethanolamine composite grinding aid (molecular weight of polyacrylic acid sodium is 3 million, manufacturer Guangzhou Gaoguo Chemical Co., Ltd., model pass, mass ratio of polyacrylic acid sodium to triethanolamine is 2:1) is added during the grinding process. The grinding is carried out at 2800 r / min for 30 min to obtain barium sulfate powder with a particle size of 5 μm. A silane coupling agent γ-aminopropyl triethoxysilane with a mass of 8 ‰ of the barium sulfate powder is used to modify the surface of the ground barium sulfate powder. The surface modification conditions are: temperature 95 ℃, time 15 min, and the modified barium sulfate powder with a surface coating rate of 97% is obtained. (2) 75 parts of the modified barium sulfate powder are weighed according to the formula and placed in a mixer. 4 parts of isopropoxy tristearate titanate are added, heated to 160 ℃, and stirred at a speed of 1800 rpm for 3 min. Then 18 parts of copolymerized polypropylene resin (manufacturer Suzhou Sutai New Material Co., Ltd., model F800E), 2 parts of lubricant polyethylene wax (manufacturer Dongguan Shanyi Plastic Co., Ltd., model SCG), 4 parts of zinc stearate (manufacturer Shandong Ranyue New Material Technology Co., Ltd.), and 1 part of antioxidant 1010 (manufacturer Dongguan Xingyuan Chemical Co., Ltd.) are added in turn, and stirred at a speed of 2500 rpm for 10 min. Then the above mixture is fed into a double screw extruder for plasticizing, mixing, extruding and granulating. The temperature interval of the double screw extruder is: zone one 145 ℃, zone two 160 ℃, zone three 180 ℃, zone four 190 ℃, zone five 200 ℃, zone six 205 ℃, zone seven 210 ℃, zone eight 210 ℃, zone nine 220 ℃, and the head 220 ℃. The feeding speed is 28 rpm, the extruder speed is 300 rpm, and the length-diameter ratio of the extruder is 48. After air cooling and granulation, a high specific gravity polypropylene filling master batch with a modified barium sulfate powder content of 72.1% is obtained.

[0056] Example 2

[0057] The present embodiment provides a preparation method of a high specific gravity polypropylene filling master batch, comprising the following steps: (1) The high-quality barite ore (sulfate content of 95%, manufacturer Jiangxi Guangyuan Chemical Industry Co., Ltd., model GS-2) is subjected to coarse crushing, washing, and crushing to obtain barite with a diameter of 8 mm. A ball mill is used to grind and classify the barite, and 6‰ of the mass of the barite of a polyacrylic acid sodium and triethanolamine composite grinding aid (molecular weight of polyacrylic acid sodium 3 million, manufacturer Guangzhou Gaoguo Chemical Co., Ltd., model pass, mass ratio of polyacrylic acid sodium to triethanolamine 2:1) is added during the grinding process. The grinding is carried out at 2800 r / min for 30 min to obtain barium sulfate powder with a particle size of 5 μm. A silane coupling agent γ-aminopropyl triethoxysilane with a mass of 10‰ of the barium sulfate powder is used to modify the surface of the ground barium sulfate powder. The surface modification conditions are: temperature 95℃, time 15 min, and the modified barium sulfate powder with a surface coating rate of 97% is obtained. (2) 86 parts of the modified barium sulfate powder are weighed according to the formula and placed in a mixer. 6 parts of isopropoxy tristearate titanate are added, heated to 160℃, and stirred at a speed of 1800 rpm for 3 min. Then 18 parts of copolymerized polypropylene resin (manufacturer Suzhou Sutai New Material Co., Ltd., model F800E), 3 parts of lubricant polyethylene wax (manufacturer Dongguan Shanyi Plastic Co., Ltd., model SCG), 5 parts of zinc stearate (manufacturer Shandong Ranyue New Material Technology Co., Ltd.), and 1.5 parts of antioxidant 1010 (manufacturer Dongguan Xingyuan Chemical Co., Ltd.) are added in turn, and stirred at a speed of 2500 rpm for 10 min. Then the above mixture is fed into a double screw extruder for plasticizing, mixing, extruding and granulating. The temperature intervals of the double screw extruder are: zone 1 145℃, zone 2 160℃, zone 3 180℃, zone 4 190℃, zone 5 200℃, zone 6 205℃, zone 7 210℃, zone 8 210℃, zone 9 220℃, and the head 220℃. The feeding speed is 28 rpm, the extruder speed is 300 rpm, and the length-diameter ratio of the extruder is 48. After air cooling and granulation, a high specific gravity polypropylene filling master batch with a modified barium sulfate powder content of 71.9% is obtained.

[0058] Example 3

[0059] The present embodiment provides a preparation method of a high specific gravity polypropylene filling master batch, comprising the following steps: (1) The high-quality barite raw ore (sulfate content of 95%, manufacturer Jiangxi Guangyuan Chemical Industry Co., Ltd., model GS-2) is coarsely crushed, washed, and crushed to obtain barite with a diameter of 8 mm. A ball mill is used to grind and classify the barite, and a composite grinding aid of 7 ‰ of the mass of the barite (molecular weight of polyacrylic acid sodium 3 million, manufacturer Guangzhou Gaoguo Chemical Co., Ltd., model pass, mass ratio of polyacrylic acid sodium to triethanolamine 2:1) is added during the grinding process. The grinding is carried out at 2800 r / min for 30 min to obtain barium sulfate powder with a particle size of 5 μm. A silane coupling agent γ-aminopropyl triethoxysilane with a mass of 13 ‰ of the mass of the barium sulfate powder is used to modify the surface of the ground barium sulfate powder. The surface modification conditions are: temperature 95 ℃, time 15 min, and the modified barium sulfate powder with a surface coating rate of 97% is obtained. (2) 90 parts of the modified barium sulfate powder are weighed according to the formula and placed in a mixer. 7 parts of isopropoxy tristearate titanate are added, heated to 160 ℃, and stirred at a speed of 1800 rpm for 3 min. Then 18 parts of copolymerized polypropylene resin (manufacturer Suzhou Plastai New Material Co., Ltd., model F800E), 4 parts of lubricant polyethylene wax (manufacturer Dongguan Shanyi Plastic Co., Ltd., model SCG), 6 parts of zinc stearate (manufacturer Shandong Ranyue New Material Technology Co., Ltd.), and 1.8 parts of antioxidant 1010 (manufacturer Dongguan Xingyuan Chemical Co., Ltd.) are added in turn, and stirred at a speed of 2500 rpm for 10 min. Then the above mixture is fed into a double screw extruder for plasticizing, mixing, extruding and granulating. The temperature interval of the double screw extruder is: zone one 145 ℃, zone two 160 ℃, zone three 180 ℃, zone four 190 ℃, zone five 200 ℃, zone six 205 ℃, zone seven 210 ℃, zone eight 210 ℃, zone nine 220 ℃, and the head 220 ℃. The feeding speed is 28 rpm, the extruder speed is 300 rpm, and the length-diameter ratio of the extruder is 48. After air cooling and granulation, a high specific gravity polypropylene filling master batch with a modified barium sulfate powder content of 70.9% is obtained.

[0060] Comparative Example 1

[0061] This comparative example provides a method for preparing a polypropylene filling master batch, comprising the following steps: (1) The calcium carbonate powder (manufacturer Jiangxi Guangyuan Chemical Industry Co., Ltd., model GY-616) is surface modified with a silane coupling agent γ-aminopropyl triethoxysilane with a mass of 8 ‰. The surface modification conditions are: temperature 95 ℃, time 15 min, and the modified calcium carbonate powder with a surface coating rate of 97% is obtained. (2) 90 parts of modified calcium carbonate powder was weighed according to the formula and placed in a mixer, 7 parts of isopropoxy tristearate acid ester titanate was added, heated to 160℃, stirred at a speed of 1800 rpm for 3 min, then 18 parts of copolymerized polypropylene resin (manufacturer: Suzhou Plastech New Material Co., Ltd., model F800E), 4 parts of lubricant polyethylene wax (manufacturer: Dongguan Shanyi Plastic Co., Ltd., model SCG), 6 parts of zinc stearate (manufacturer: Shandong Ranyue New Material Technology Co., Ltd.), 1.8 parts of antioxidant 1010 (manufacturer: Dongguan Xingyuan Chemical Co., Ltd.) were added in turn, and stirred at a speed of 2500 rpm for 10 min; then the above mixture was fed into a double screw extruder for plasticizing, mixing, extruding and granulating, the temperature interval of the double screw extruder was: zone 1 145℃, zone 2 160℃, zone 3 180℃, zone 4 190℃, zone 5 200℃, zone 6 205℃, zone 7 210℃, zone 8 210℃, zone 9 220℃, and the die head 220℃, the feeding speed was 28 rpm, the extruder speed was 300 rpm, and the length-diameter ratio of the extruder was 48; then air cooling and granulation were carried out, and a polypropylene filling master batch was obtained.

[0062] Comparative Example 2

[0063] The present comparative example provides a preparation method of a polypropylene filling master batch, comprising the following steps: (1) The talc powder (manufacturer: Jiangxi Guangyuan Chemical Co., Ltd., model HS-658) was surface modified with silane coupling agent γ-aminopropyl triethoxysilane at a mass fraction of 8 ‰, the surface modification conditions were: temperature 95℃, time 15 min, and the modified talc powder with a surface coating rate of 97% was obtained; (2) The modified talc powder is weighed according to the formula, 90 parts are placed in a mixer, 7 parts of titanium acid ester coupling agent isopropoxy tristearate is added, heated to 160°C, stirred at a speed of 1800 rpm for 3 min, then 10 parts of copolymerized polypropylene resin (manufacturer: Suzhou Plastech New Material Co., Ltd., model F800E), 4 parts of lubricant polyethylene wax (manufacturer: Dongguan Shanyi Plastic Co., Ltd., model SCG), 6 parts of zinc stearate (manufacturer: Shandong Ranyue New Material Technology Co., Ltd.), 1.8 parts of antioxidant 1010 (manufacturer: Dongguan Xingyuan Chemical Co., Ltd.) are added in turn, and stirred at a speed of 2500 rpm for 10 min; then the above mixture is fed into a double screw extruder for plasticizing, mixing, extruding and granulating, the temperature interval of the double screw extruder is: zone 1 145°C, zone 2 160°C, zone 3 180°C, zone 4 190°C, zone 5 200°C, zone 6 205°C, zone 7 210°C, zone 8 210°C, zone 9 220°C, and the head 220°C, the feeding speed is 28 rpm, the extruder speed is 300 rpm, and the length-diameter ratio of the extruder is 48; then air cooling and granulation are carried out to obtain a polypropylene filling master batch.

[0064] The polypropylene filling master batch obtained in the above examples 1-3 and comparative examples 1-2 is processed into a standard sample according to the ratio of base resin (PP) to master batch of 2:1, and performance tests are carried out according to GB / T 1033.1-2008, GB / T 1843-2008 (notched impact strength), GB / T 1040.1-2018, GB / T 9341-2008. The test results are shown in Table 1.

[0065] Table 1. Physical and mechanical property index test results of examples 1-3 and comparative examples 1-2

[0066] As can be seen from Table 1, compared with calcium carbonate and talc powder, the polypropylene filling master batch prepared by the barium sulfate provided by the present application exhibits better specific gravity and mechanical properties (impact strength, tensile strength, elongation at break, bending strength and bending modulus), which indicates that the high specific gravity polypropylene filling master batch provided by the present application has more excellent comprehensive performance than other filling master batch products on the market.

[0067] The above only describes the preferred embodiments of the present application, and it should be pointed out that for ordinary skilled persons in the technical field, some improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A high-density polypropylene filler masterbatch, characterized in that, It is mainly prepared from the following raw materials in parts by weight: 8-28 parts polypropylene, 70-92 parts modified barium sulfate powder, 1-4 parts lubricant, 4-8 parts titanate coupling agent, 3-6 parts zinc stearate, and 0.5-2 parts antioxidant.

2. The high-density polypropylene filler masterbatch according to claim 1, characterized in that, The preparation method of the modified barium sulfate powder includes the following steps: Barite is mixed with a grinding aid and then ground to obtain barium sulfate powder. The barium sulfate powder is mixed with a surface modifier to perform surface modification, thereby obtaining modified barium sulfate powder.

3. The high-density polypropylene filler masterbatch according to claim 2, characterized in that, In the preparation method of the modified barium sulfate powder, the grinding aid includes a mixture of sodium polyacrylate and triethanolamine, wherein the mass ratio of sodium polyacrylate to triethanolamine is 1~3:1; and the mass ratio of the grinding aid to barite is 5~7:1000.

4. A high-density polypropylene filler masterbatch according to claim 2 or 3, characterized in that, In the preparation method of the modified barium sulfate powder, the surface modifier includes a silane coupling agent, which includes one or more of γ-diethylenetriaminopropyltrimethoxysilane, γ-aminopropylmethyldimethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropylmethyldiethoxysilane, γ-aminopropyltriethoxysilane, and γ-diethylaminomethyltriethoxysilane; the mass ratio of the surface modifier to the barium sulfate powder is 8~15:1000.

5. The high-density polypropylene filler masterbatch according to claim 4, characterized in that, In the preparation method of the modified barium sulfate powder, the particle size of the barium sulfate powder is 4~6μm, and the surface coating rate of the modified barium sulfate powder is ≥97%.

6. The high-density polypropylene filler masterbatch according to claim 1, characterized in that, The polypropylene includes one or more of homopolymer polypropylene, copolymer polypropylene, and random copolymer polypropylene.

7. A high-density polypropylene filler masterbatch according to claim 1 or 6, characterized in that, The lubricant includes one or more of polyethylene wax, oxidized polyethylene wax, polypropylene wax, stearic acid, and solid paraffin; the titanate coupling agent includes one or more of isopropoxytristearatetoxytitanate, isopropoxytris(dioctyl phosphate)titanate, bis(dioctyl pyrophosphate)ethylenetitanate, diisostearoyltitanate ethylene, and isopropyltrioleoyltitanate; the antioxidant includes one or more of antioxidant 1010, antioxidant 1076, and antioxidant 168.

8. A method for preparing a high-density polypropylene filler masterbatch according to any one of claims 1 to 7, characterized in that, Includes the following steps: Polypropylene, modified barium sulfate powder, lubricant, titanate coupling agent, zinc stearate and antioxidant are mixed and melt-extruded to obtain high specific gravity polypropylene filler masterbatch.

9. The preparation method according to claim 8, characterized in that, The mixing conditions include: a temperature of 160~210℃, a rotation speed of 1800~2500rpm, and a time of 10~15min.

10. The preparation method according to claim 8 or 9, characterized in that, The conditions for melt extrusion include: a feeding speed of 26~32 rpm, a temperature of 145~220℃, and a screw speed of 250~350 rpm.

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