Impact-resistant polypropylene plate for stirring tank and preparation method of impact-resistant polypropylene plate
By adding EPDM rubber, nano-silica, and self-made heat-resistant additives to polypropylene sheets, the toughness and heat resistance of polypropylene sheets are improved, solving the problem of insufficient impact resistance and high-temperature resistance of polypropylene sheets in mixing tanks, and achieving higher equipment stability and reliability.
Patent Information
- Application Number
- CN202511246132.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-02
- Publication Date
- 2025-11-11
AI Technical Summary
Existing polypropylene sheets lack sufficient impact and high-temperature resistance in mixing tanks, making them prone to cracking, deformation, or breakage under complex working conditions. Furthermore, their mechanical strength decreases at high temperatures, limiting their application in heavy-duty mixing equipment and high-temperature processes.
By adding EPDM rubber, nano-silica, and self-made heat-resistant additives, the toughness and heat resistance of polypropylene sheets are improved, and the interfacial compatibility is enhanced by combining maleic anhydride-grafted polypropylene, thus preparing impact-resistant polypropylene sheets.
It improves the impact resistance and high temperature resistance of polypropylene sheets, extends the service life of mixing tanks, reduces equipment replacement frequency and production costs, and expands its application range in high-temperature processes.
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Abstract
Description
Technical Field
[0001] This invention relates to the field of polypropylene materials technology, specifically to an impact-resistant polypropylene plate for a mixing tank and its preparation method. Background Technology
[0002] In the fields of plastics processing and chemical equipment manufacturing, stirred tanks are common mixing and reaction vessels, and the performance of their materials directly affects the service life and process stability of the equipment. Traditional stirred tanks are mostly made of metal materials such as stainless steel or carbon steel, which, although possessing high mechanical strength, are prone to chemical corrosion in corrosive media, leading to equipment damage and material contamination. To overcome this problem, engineering plastics have gradually been introduced into the field of stirred tank linings, among which polypropylene has become the preferred material due to its excellent chemical corrosion resistance, low density, and good processing performance.
[0003] Currently, the practical application of ordinary polypropylene sheets in the manufacture of mixing tanks still reveals some problems that urgently need to be solved. On the one hand, its impact resistance is relatively weak, especially under complex working conditions such as the impact of agitator blades and material friction, it is prone to cracking, deformation, or even breakage, which seriously restricts its application in heavy-duty mixing equipment. In some production scenarios with extremely high requirements for equipment stability, damage to the sheets may also lead to production accidents, causing serious economic losses. For example, in some chemical reaction processes, if the mixing tank is damaged by impact, it may lead to material leakage, causing environmental pollution or even safety accidents. Furthermore, the high-temperature resistance of ordinary polypropylene sheets also has significant shortcomings. Their heat distortion temperature (HDT) is typically around 100℃. However, in chemical production, some chemical reactions need to be carried out at temperatures close to the melting point of polypropylene. At these temperatures, the heat resistance of ordinary polypropylene sheets is simply insufficient. High temperatures can cause molecular chain breakage, drastically reducing the mechanical strength of the sheet and significantly shortening the service life of the mixing tank. This increases the frequency of equipment replacement and production costs. Simultaneously, prolonged exposure to high temperatures accelerates the oxidation and aging of polypropylene sheets, further exacerbating their performance degradation. This significantly reduces the reliability of the mixing tank under high-temperature conditions, limiting its application in many industrial fields requiring high-temperature processing.
[0004] In summary, there is an urgent need to invent a polypropylene sheet for mixing tanks that is both impact-resistant and high-temperature resistant, in order to meet the higher demands in the field of polypropylene material technology. Summary of the Invention
[0005] This invention proposes an impact-resistant polypropylene plate for mixing tanks and its preparation method, which solves the problem of poor impact resistance and heat resistance of polypropylene in related technologies.
[0006] The technical solution of the present invention is as follows: This invention proposes an impact-resistant polypropylene plate for a mixing tank, comprising the following raw materials in parts by weight: 70-80 parts polypropylene resin, 8-12 parts EPDM rubber, 5-10 parts nano silica, 4-8 parts heat-resistant additives, 3-5 parts maleic anhydride-grafted polypropylene, 0.5-1.5 parts antioxidants, and 0.8-1.6 parts lubricant.
[0007] The addition of EPDM rubber to the raw materials of this invention acts as an elastomer, which can toughen the material and improve its impact resistance. The addition of nano-silica can effectively improve the high temperature resistance of the polypropylene board. Furthermore, the addition of maleic anhydride-grafted polypropylene can improve the interfacial compatibility between nano-silica and the polypropylene matrix, improve its dispersibility, and allow the performance of nano-silica to be fully utilized, thereby further improving the heat resistance of the matrix.
[0008] As a further technical solution, the antioxidant is one or more of antioxidant 1010, antioxidant 168 and antioxidant 264.
[0009] As a further technical solution, the lubricant is one of calcium stearate, zinc stearate, and polyethylene wax.
[0010] As a further technical solution, the heat-resistant additive is prepared through the following steps: A1. In a three-necked flask equipped with a condenser and a constant-pressure dropping funnel, evacuate the air three times to remove it. Then, mix 3,5-dichlorophenol and toluene, stir and dissolve. Next, mix 4-amino-1,2,4-triazole, triethylamine and toluene, stir and dissolve. Then, add the mixture to the flask through the constant-pressure dropping funnel. After the addition is complete, heat to 55-60℃ and maintain the temperature for 8-10 hours. After the reaction is complete, perform post-processing to obtain the initial product. A2. In a three-necked flask equipped with a condenser and a constant-pressure dropping funnel, evacuate the air three times to remove it. Then mix the initial product, chlorooctadecane, and toluene. While stirring, slowly add sodium hydroxide solution (20% by mass) dropwise through the constant-pressure dropping funnel. After the addition is complete, raise the temperature to 60-70℃ and keep the reaction at that temperature for 5-6 hours. After the reaction is complete, perform post-processing to obtain the heat-resistant additive.
[0011] As a further technical solution, the ratio of the amounts of 3,5-dichlorophenol, 4-amino-1,2,4-triazole, and triethylamine in step A1 is 16.1g:17.5-18.3g:22.0-24.5g.
[0012] As a further technical solution, the ratio of the amount of the initial product, chlorooctadecane, and sodium hydroxide solution in step A2 is 25.8g:28.8g:20mL.
[0013] The reaction formula for preparing heat-resistant additives is as follows:
[0014] It should be noted that in the preparation of the heat-resistant additive, the molar ratio of 3,5-dichlorophenol to 4-amino-1,2,4-triazole in step A1 needs to be strictly controlled to be close to 1:2, and 4-amino-1,2,4-triazole needs to be in excess to ensure complete reaction.
[0015] As can be seen from the above reaction formula, the prepared heat-resistant additive contains a triazole ring, a benzene ring, and an aliphatic segment. The triazole ring contains three N heteroatoms and has a high CN bond energy, which provides a certain degree of heat resistance. Similarly, the benzene ring also has heat resistance properties. The two can work synergistically to significantly improve the heat resistance of the matrix. Finally, the introduced aliphatic segment contains a long carbon chain, and the C-C single bond can rotate freely, reducing the segment motion barrier and making the material more prone to deformation rather than fracture under stress, thus improving the impact resistance of the matrix.
[0016] This invention also provides a method for preparing an impact-resistant polypropylene plate for a mixing tank, comprising the following steps: B1. Polypropylene resin, EPDM rubber, nano silica, heat-resistant additives, maleic anhydride-grafted polypropylene, antioxidants and lubricants are added sequentially to a high-speed mixer and mixed at high speed to obtain a mixture. B2. The mixture is fed into a twin-screw extruder for melt blending and extrusion to obtain a molten composite material. It is then fed into a flat vulcanizing machine for pressing to fully shape the material. After natural cooling to room temperature, it is demolded to obtain an impact-resistant polypropylene sheet for mixing tanks.
[0017] As a further technique B2, the mixture is fed into a twin-screw extruder for melt blending and extrusion to obtain a molten composite material, which is then fed into a flat vulcanizing machine for pressing to fully shape the material. After natural cooling to room temperature, it is demolded to obtain an impact-resistant polypropylene sheet for mixing tanks.
[0018] The high-speed stirring speed is 1000-1200 r / min, and the stirring time is 5-10 min.
[0019] As a further technical solution, the screw speed of the twin-screw extruder is 200-250 r / min, and the temperature control of each zone is as follows: Zone 1 160-170℃, Zone 2 170-180℃, Zone 3 180-190℃, Zone 4 170-180℃.
[0020] As a further technical solution, the pressing temperature is 180-190℃, the pressure is 10-15MPa, and the pressing time is 10-15min.
[0021] The working principle and beneficial effects of this invention are as follows: Advantage 1: The addition of EPDM rubber to the raw materials of this invention can improve the impact resistance of polypropylene sheets; Advantage 2: The addition of nano-silica in this invention, and the use of maleic anhydride grafted polypropylene, improves the compatibility with the matrix and significantly enhances the high temperature resistance of the polypropylene board. Advantage 3: This invention has a self-made heat-resistant additive. By introducing three functional groups, it can improve the heat resistance and impact resistance of polypropylene sheets. In summary, the polypropylene sheet prepared by this invention has both heat resistance and impact resistance, and has important application value in the field of polypropylene material technology. Detailed Implementation
[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0023] In the following examples and comparative examples: The polypropylene is produced by Yanshan Petrochemical and is designated as T30S; the ethylene propylene diene monomer (EPDM) rubber is produced by PetroChina Jilin Petrochemical Company and is designated as J-3080P; the average particle size of the nano-silica is 20-40nm.
[0024] Example 1 Preparation of heat-resistant additives: A1. In a three-necked flask equipped with a condenser and a constant-pressure dropping funnel, the air was removed by evacuating the flask three times. Then, 16.1 g of 3,5-dichlorophenol and 50 mL of toluene were mixed and stirred until dissolved. Next, 17.5 g of 4-amino-1,2,4-triazole and 22.0 g of triethylamine were mixed with 50 mL of toluene and stirred until dissolved. The mixture was then added to the flask through the constant-pressure dropping funnel. After the addition was complete, the mixture was heated to 55 °C and kept at this temperature for 8 hours. After the reaction was complete, the mixture was filtered, and the solvent and excess triethylamine were removed by rotary evaporation. Finally, the mixture was washed several times with distilled water to obtain the initial product. A2. In a three-necked flask equipped with a condenser and a constant-pressure dropping funnel, the air was removed by evacuating the flask three times. Then, 25.8 g of the initial product, 28.8 g of chlorooctadecane and 20 mL of toluene were mixed and, while stirring, sodium hydroxide solution (20% by mass) was slowly added dropwise through the constant-pressure dropping funnel. After the addition was complete, the temperature was raised to 60 °C and the reaction was maintained at this temperature for 5 h. After the reaction was complete, the mixture was separated and washed three times with deionized water. The organic phase was dried with anhydrous sodium sulfate, filtered, and the solvent toluene was removed by rotary evaporation under reduced pressure to obtain the heat-resistant additive. A method for preparing an impact-resistant polypropylene plate for a mixing tank includes the following steps: B1. Add 70 parts of polypropylene resin, 8 parts of EPDM rubber, 5 parts of nano silica (particle size 20nm), 4 parts of heat-resistant additives, 3 parts of maleic anhydride-grafted polypropylene, 0.5 parts of antioxidant 1010 and 0.8 parts of calcium stearate to a high-speed mixer in sequence, and stir and mix at 1000r / min for 5min to obtain a mixture. B2. The mixture is fed into a twin-screw extruder (screw speed 200 r / min, zone 1 160℃, zone 2 170℃, zone 3 180℃, zone 4 170℃) for melt blending and extrusion to obtain a molten composite material. The molten composite material is then fed into a flat vulcanizing machine and pressed at 180℃ and 1 MPa for 10 min to fully shape the material. After natural cooling to room temperature, the material is demolded to obtain an impact-resistant polypropylene sheet for mixing tanks.
[0025] Example 2 Preparation of heat-resistant additives: A1. In a three-necked flask equipped with a condenser and a constant-pressure dropping funnel, the air was removed by evacuating the flask three times. Then, 16.1 g of 3,5-dichlorophenol and 50 mL of toluene were mixed and stirred until dissolved. Next, 18.3 g of 4-amino-1,2,4-triazole and 22.0 g of triethylamine were mixed with 50 mL of toluene and stirred until dissolved. The mixture was then added to the flask through the constant-pressure dropping funnel. After the addition was complete, the mixture was heated to 6 °C and kept at this temperature for 10 h. After the reaction was complete, the mixture was filtered, and the solvent and excess triethylamine were removed by rotary evaporation. Finally, the mixture was washed several times with distilled water to obtain the initial product. A2. In a three-necked flask equipped with a condenser and a constant-pressure dropping funnel, the air was removed by evacuating the flask three times. Then, 25.8 g of the initial product, 28.8 g of chlorooctadecane and 20 mL of toluene were mixed and, while stirring, sodium hydroxide solution (20% by mass) was slowly added dropwise through the constant-pressure dropping funnel. After the addition was complete, the temperature was raised to 70 °C and the reaction was maintained at this temperature for 6 h. After the reaction was complete, the mixture was separated and washed three times with deionized water. The organic phase was dried with anhydrous sodium sulfate, filtered, and the solvent toluene was removed by rotary evaporation under reduced pressure to obtain the heat-resistant additive. A method for preparing an impact-resistant polypropylene plate for a mixing tank includes the following steps: B1. Add 75 parts of polypropylene resin, 10 parts of EPDM rubber, 7.5 parts of nano silica (particle size 20nm), 6 parts of heat-resistant additives, 4 parts of maleic anhydride-grafted polypropylene, 1.0 part of antioxidant 168 and 1.2 parts of zinc stearate to a high-speed mixer in sequence, and stir and mix at 1100r / min for 10min to obtain a mixture. B2. The mixture is fed into a twin-screw extruder (screw speed 250 r / min, zone 1 170℃, zone 2 180℃, zone 3 190℃, zone 4 180℃) for melt blending and extrusion to obtain a molten composite material. Then it is fed into a flat vulcanizing machine and pressed at 190℃ and 15MPa for 15 min to fully shape the material. After natural cooling to room temperature, it is demolded to obtain an impact-resistant polypropylene sheet for mixing tanks.
[0026] Example 3 The only difference between this embodiment and Embodiment 2 is that, in this embodiment, a method for preparing an impact-resistant polypropylene plate for a mixing tank includes the following steps: B1. Add 80 parts of polypropylene resin, 12 parts of EPDM rubber, 10 parts of nano silica (particle size 20nm), 8 parts of heat-resistant additives, 5 parts of maleic anhydride-grafted polypropylene, 1.5 parts of antioxidant 264 and 1.6 parts of polyethylene wax to a high-speed mixer in sequence, and stir and mix at 1200r / min for 10min to obtain a mixture. B2. The mixture is fed into a twin-screw extruder (screw speed 250 r / min, zone 1 170℃, zone 2 180℃, zone 3 190℃, zone 4 180℃) for melt blending and extrusion to obtain a molten composite material. Then it is fed into a flat vulcanizing machine and pressed at 190℃ and 15MPa for 15 min to fully shape the material. After natural cooling to room temperature, it is demolded to obtain an impact-resistant polypropylene sheet for mixing tanks.
[0027] Comparative Example 1 The only difference between this comparative example and Example 2 is that no heat-resistant additives were added in this comparative example to obtain a polypropylene board.
[0028] Comparative Example 2 The only difference between this comparative example and Example 2 is that in this comparative example, nano-silica is not added to obtain a polypropylene board.
[0029] The following performance tests were conducted on Examples 1-3 and Comparative Examples 1-2: Impact strength was determined according to GB / T 1843-2008 standard; The heat distortion temperature was determined according to GB / T 1634.2-2019 standard. The measurement results are shown in Table 1: Table 1
[0030] As can be seen from the table above, the polypropylene sheet prepared in the embodiments of the present invention has both heat resistance and impact resistance. Furthermore, the heat-resistant additives have a significant impact on the heat resistance and impact resistance. Therefore, the present invention has important application value in the field of polypropylene material technology.
[0031] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. An impact-resistant polypropylene sheet for a mixing tank, characterized in that, It includes the following raw materials in parts by weight: 70-80 parts polypropylene resin, 8-12 parts EPDM rubber, 5-10 parts nano silica, 4-8 parts heat-resistant additives, 3-5 parts maleic anhydride-grafted polypropylene, 0.5-1.5 parts antioxidants and 0.8-1.6 parts lubricants.
2. The impact-resistant polypropylene sheet for a mixing tank according to claim 1, characterized in that, The heat-resistant additive is prepared by the following steps: A1. Vacuum the flask three times to remove air, then mix 3,5-dichlorophenol and toluene, stir and dissolve, then mix 4-amino-1,2,4-triazole, triethylamine and toluene, stir and dissolve, and add to the flask. React at 55-60℃ for 8-10 hours until the reaction is complete, and the initial product is obtained. A2. Vacuum the flask three times to remove air, then mix the initial product, chlorooctadecane and toluene, and add sodium hydroxide solution while stirring. After the addition is complete, keep the mixture at ℃ for 5-6 hours. After the reaction is complete, perform post-processing to obtain the heat-resistant additive.
3. The impact-resistant polypropylene sheet for a mixing tank according to claim 2, characterized in that, In step A1, the ratio of the amounts of 3,5-dichlorophenol, 4-amino-1,2,4-triazole, and triethylamine is 16.1g:17.5-18.3g:22.0-24.5g.
4. The impact-resistant polypropylene sheet for a mixing tank according to claim 2, characterized in that, In step A2, the ratio of the initial product, chlorooctadecane, and sodium hydroxide solution is 25.8g:28.8g:20mL.
5. The impact-resistant polypropylene sheet for a mixing tank according to claim 1, characterized in that, The antioxidant is one or more of antioxidant 1010, antioxidant 168 and antioxidant 264.
6. The impact-resistant polypropylene sheet for a mixing tank according to claim 1, characterized in that, The lubricant is one of calcium stearate, zinc stearate, and polyethylene wax.
7. A method for preparing an impact-resistant polypropylene sheet for a mixing tank, used to prepare the impact-resistant polypropylene sheet for a mixing tank as described in any one of claims 1-6, characterized in that, Includes the following steps: This invention also provides a method for preparing an impact-resistant polypropylene plate for a mixing tank, comprising the following steps: B1. Polypropylene resin, EPDM rubber, nano silica, heat-resistant additives, maleic anhydride-grafted polypropylene, antioxidants and lubricants are added sequentially to a high-speed mixer and mixed at high speed to obtain a mixture. B2. The mixture is fed into a twin-screw extruder for melt blending and extrusion to obtain a molten composite material. It is then fed into a flat vulcanizing machine for pressing to fully shape the material. After natural cooling to room temperature, it is demolded to obtain an impact-resistant polypropylene sheet for mixing tanks.
8. The method for preparing an impact-resistant polypropylene plate for a mixing tank according to claim 7, characterized in that, The high-speed stirring speed is 1000-1200 r / min, and the time is 5-10 min.
9. The method for preparing an impact-resistant polypropylene plate for a mixing tank according to claim 7, characterized in that, The screw speed of the twin-screw extruder is 200-250 r / min, and the temperature control of each zone is as follows: Zone 1 160-170℃, Zone 2 170-180℃, Zone 3 180-190℃, Zone 4 170-180℃.