CN113549272A - Durable hydrophilic polypropylene separation net material and preparation method thereof - Google Patents
Durable hydrophilic polypropylene separation net material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a durable hydrophilic polypropylene barrier net material and a preparation method thereof, wherein a magnesium sulfate whisker stiffening modification technology is combined with a hydrophilic substance slow-release traction technology, a hydrophilic agent is pulled to the surface of the material by utilizing the self-polymerization capacity of dopamine to form a uniform hydrophilic layer, and the hydrophilic substance is locked by utilizing the slow-release and occlusion effects of sustained-release agents such as EAA sodium salt and the like, so that the barrier net material has good appearance, stiffness, solvent resistance and mechanical comprehensive performance, and also has permanent hydrophilic performance and durable anti-pollution performance. The method is simple, excellent in performance, obvious in effect and good in industrial application prospect, the prepared separation net material has the advantages of good supporting and shunting effects, corrosion resistance, high-efficiency and durable pollution resistance and easiness in cleaning, the problem of fine particle adhesion can be greatly improved, the service efficiency of the fluid treatment part is greatly improved, the service life of the fluid treatment part is greatly prolonged, and the method is suitable for the fluid treatment part which is in close contact with hydrophilic fluid and needs the supporting and shunting effects.
Description
Technical Field
The invention relates to the field of materials, in particular to a durable hydrophilic polypropylene mesh material and a preparation method thereof.
Background
The screen is a main component element in the fluid processing component, and the main function of the screen is to separate the processing elements, establish fluid channels between the elements and further rapidly divide the fluid. In the fluid treatment process, the fluid meeting the requirements after treatment is collected through the collecting pipeline, the remaining fluid which is not met the requirements after concentration contains a large amount of impurities, particles, microorganisms and other substances, and the fine substances can be attached to, blocked and retained on the separation net, so that the channel area for fluid treatment is reduced, harmful bacteria and other microorganisms can be bred, the effect and efficiency of a fluid treatment part are influenced, and the fluid treatment part is not easy to clean.
With the advancement of fluid treatment technology, the flux and the anti-fouling capacity of fluid treatment elements, especially the latter, have been a matter of concern for technologists and manufacturers, and are of great importance, but the anti-fouling capacity of the spacer webs has been studied and improved only rarely. The coverage area of the separation net is equivalent to the area of the key treatment element, and a large number of corners and gaps exist on the separation net, so that dead corners and blockage are easily formed. The fluid passages of the spacer mesh are not smooth, and the efficiency and quality of the fluid treatment component are greatly compromised, resulting in attenuation of the flux of the fluid treatment component, reduced product quality, poor use, and reduced lifetime.
Therefore, finding a simple and universal modification method for improving the surface hydrophilicity of the separation net and endowing the separation net material with permanent anti-pollution performance is one of the very important links in the fluid treatment engineering.
The magnesium sulfate whisker reinforced material has the characteristics of good appearance quality, high strength, low density, good heat resistance and the like, has high mechanical strength, can elastically bear larger strain without permanent deformation, has small loss of strength at high temperature and no fatigue effect, is particularly suitable for reinforcing and stiffening ultrathin parts and tiny parts, has wide application prospect, and is a new development direction of high-performance composite materials.
For example, the invention patent with the publication patent number of CN 201210147865.1 discloses a concentrated water net material for a reverse osmosis membrane, which adopts high-density polyethylene and ethylene-octene copolymer elastomer to carry out blending modification on polypropylene, and adds a nucleating agent and an antibacterial agent; the high-density polyethylene composite material comprises, by weight, 100 parts of polypropylene, 5-15 parts of high-density polyethylene, 5-10 parts of an ethylene-octene copolymer elastomer, 0.1-0.5 part of a nucleating agent and 0.2-0.8 part of an antibacterial agent. This patent adopts the modified polypropylene of elastomer and polyethylene, makes the rigidity of material reduce, can be soft partially after making the net that separates, yielding, the effect of support and establishing the passageway can not be better played, and antibacterial effect can be played in the use of antibacterial agent, nevertheless does not play the improvement effect to the adhesion of separation tiny granule.
For example, the invention patent with application number 201610781554.9 discloses a preparation method of an anti-pollution concentrated water flow passage net, application thereof and a reverse osmosis device, wherein the method of coating anti-pollution treatment liquid on the surface of the concentrated water flow passage net is adopted to improve the hydrophilicity of the surface of the concentrated water flow passage net so as to reduce the adsorption capacity of the concentrated water flow passage net on pollutants. The method of this patent adoption coating, there is the coating inequality, and dead angle position can not reach, has increased the thickness that separates the net after the coating, and reduces the runner area, influences efficiency, and soaks in water environment for a long time, and the coating easily drops with separating between the net, and the granule blocks up the runner, the production antipollution effect that can not last.
The noun explains: PP: polypropylene, [ PE: polyethylene, HDPE high density polyethylene, EBS: ethylene bis fatty acid amide, TAF: modified ethylene bis fatty acid amide.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a durable hydrophilic polypropylene mesh material and a preparation method thereof. The invention combines the magnesium sulfate whisker stiffening modification technology with the hydrophilic substance slow-release traction technology, utilizes the self-polymerization capacity of dopamine to pull a hydrophilic agent to the surface of a material to form a uniform hydrophilic layer, and utilizes the slow-release and confining effects of EAA sodium salt to lock the hydrophilic substance, so that the mesh material has good appearance, stiffness and mechanical comprehensive performance, and also has permanent hydrophilic performance and lasting pollution resistance. The method is simple, excellent in performance, obvious in effect and good in industrial application prospect, and the prepared separation net material is good in supporting and shunting effect, good in corrosion resistance, high-efficiency and durable in pollution resistance, easy to clean, capable of greatly improving the problem of fine particle adhesion, capable of greatly improving the treatment efficiency of the fluid treatment part and long in service life.
In order to solve the problems, the technical scheme of the invention is as follows:
the lasting hydrophilic polypropylene mesh material comprises main materials and auxiliary materials, wherein the main materials comprise polypropylene (PP) resin: 73-95% of modified magnesium sulfate whisker: 1-5% of an acrylic copolymer: 1-10% of a hydrophilic agent: 0.2-1%, slow release agent: 2-12% of a traction agent: 0.1-5%; the auxiliary materials are other auxiliary agents and comprise 0.2-0.6% of lubricant and 0.2-0.6% of antioxidant in the weight of the main materials.
In a further improvement, the polypropylene resin is one or more than two of homopolymerized PP and copolymerized PP.
In a further improvement, the hydrophilic agent is one or more than two of amphiphilic natural amino acid, polyether polyol compounds and ethylene-vinyl alcohol copolymers.
In a further improvement, the sustained release agent is one or more than two of EAA sodium salt, sodium carboxymethyl cellulose gel, cellulose acetate sustained release agent and acetaminophen sustained release agent.
In a further improvement, the traction agent is dopamine hydrochloride.
In a further improvement, the lubricant is one or more of stearic acid, ethylene bis fatty acid amide, calcium stearate and modified ethylene bis fatty acid amide; the antioxidant is one or more of hindered phenol antioxidant, thiodipropionic acid diester and phosphite ester.
In a further improvement, the manufacturing process of the modified magnesium sulfate whisker is as follows:
drying the magnesium sulfate whisker in a drying oven at the temperature of 80 ℃ for 2 hours, putting the dried magnesium sulfate whisker into a low-speed stirrer, gradually dropwise adding a surface treating agent at the temperature of 80 +/-5 ℃ and at the stirring speed of 50-150 r/min, stirring for 1-3 minutes after dropwise adding, putting the stirred magnesium sulfate whisker into a heat dissipation stirring pot, cooling to below 40 ℃ after stirring, and discharging to obtain the modified magnesium sulfate whisker, wherein the adding amount of the surface treating agent is 1-3% of the mass of the magnesium sulfate whisker.
In a further improvement, the surface treatment agent is one or more of poly (propylene glycol) -silane-poly (ethylene glycol), poly [ poly (ethylene glycol methacrylate) -b-poly (methyl methacrylate) -b-poly [ poly (ethylene glycol methacrylate) ], maleic anhydride-styrene-COONa/N, N-dimethylacetamide (DMAc) amphiphilic polymers.
A preparation method of a durable hydrophilic polypropylene separation net material comprises the following steps:
step 1), putting the main material and the auxiliary material into a low-speed stirring pot, and stirring for 2-5 minutes to obtain a uniform mixture; the main material and the auxiliary material comprise polypropylene (PP) resin: 73-95% of an acrylic copolymer: 1-10% of a hydrophilic agent: 0.2-1%, slow release agent: 2-12% of a traction agent: 0.1-5%; the auxiliary materials are other auxiliary agents and comprise 0.2-0.6% of lubricant and 0.2-0.6% of antioxidant in the weight of the main materials.
And 2) putting the uniform mixture into a main feeding bin of a double-screw extruder, putting the modified magnesium sulfate whiskers into a side feeding bin, measuring by adopting a weightlessness balance measuring mode, wherein the blanking proportion of the uniform mixture is 95-99%, the blanking proportion of the modified magnesium sulfate whiskers is 1-5%, the extrusion temperature is 180-220 ℃, the rotating speed of a main machine is 200-400 rpm, and heating, melting, mixing, bracing, cooling and granulating to obtain the durable hydrophilic polypropylene spacer mesh material.
The invention has the following beneficial effects
1. The modified magnesium sulfate reinforced separation net material has excellent mechanical property, high mechanical strength, small loss of high-temperature strength and no fatigue effect, and can elastically bear larger strain without permanent deformation; the invention adopts amphiphilic substance to modify magnesium sulfate whisker, one end of hydrophilic group is combined with magnesium sulfate, the hydrophobic end is combined with polypropylene, the compatibility of two phases is effectively enhanced, and the modified magnesium sulfate whisker has better dispersibility and binding force with polypropylene resin compared with unmodified magnesium sulfate whisker.
2. Has better appearance quality. The rough surface of the screen can form resistance to the flow of fluid and influence the treatment efficiency of the fluid treatment component; the sharp corners on the surface of the screen can scratch the fluid processing components and easily trap dirt, reducing the service life and effectiveness of the fluid processing components. According to the invention, the acrylic copolymer is adopted to improve the processability of the composite material, the acrylic copolymer can stably flow after being added, the melt tension of resin is increased, the melt elasticity of polyolefin is improved, the die release expansibility is increased, the phenomena of melt fracture, uneven filament output and the like of the composite material in the extrusion molding process are improved, the defects of rough surface, sharp corner, uneven filament diameter and the like of the separation net are avoided, and the efficiency and the service life of a fluid treatment part are effectively improved.
3. The surface of the separation net has good hydrophilicity, so that the flow of hydrophilic fluid can be accelerated, the attachment of dirt can be reduced, and the separation net has good hydrophilicity, so that a uniform hydrophilic layer is required to be formed on the surface of a material, and a good effect can be achieved. The invention adopts a method of adding hydrophilic substances into the material, improves the hydrophilicity of the material, leads the dopamine to have the autopolymerization capability, utilizes the autopolymerization capability of the dopamine to introduce the hydrophilic substances onto the surface of the material to form a uniform hydrophilic layer, and can achieve the lasting and good hydrophilic effect if the hydrophilic substances exist on the surface of the material for a long time. The slow release agent has the function of delaying the movement of hydrophilic substances, and can keep the hydrophilic substances on the surface of the material for a long time to achieve the effect of long-lasting hydrophilicity. The hydrophilic layer coating method has the defects of uneven coating, easy coating of dead corners, side vertical surfaces and other positions, increased thickness of the separation net after coating, reduced flow channel area and influenced efficiency, and the coating layer and the separation net are easy to fall off after being soaked in a water environment for a long time, particles block the flow channel and cannot continuously generate an anti-pollution effect. Compared with the method for coating the hydrophilic layer, the method adopts a mode of adding materials, can improve the hydrophilicity of the materials in an all-around and dead angle-free manner, and can keep the hydrophilicity and the pollution resistance of the separation net for a long time through the traction and slow release effects.
Detailed Description
Example 1 of the invention: the preparation method of the durable hydrophilic polypropylene mesh material comprises the 52% of polypropylene PPMM20-S, 18% of polypropylene EPS30R, 8% of acrylic copolymer P1050, 1% of hydrophilic agent, 12% of slow-release agent, 5% of traction agent, 0.4% of lubricant, 0.6% of antioxidant and 3% of modified magnesium sulfate whisker by mass fraction. The hydrophilic agent is amphiphilic substance natural amino acid; the sustained release agent is EAA sodium salt; the traction agent is dopamine hydrochloride; the lubricant is stearic acid; the antioxidant is an antioxidant 1010 and an antioxidant 168, and the addition ratio is 1: 1; the modified magnesium sulfate whisker is prepared by surface treatment of magnesium sulfate, the surface treating agent is poly (propylene glycol) -silane-poly (ethylene glycol), and the dosage of the surface treating agent is 1% of the weight of the magnesium sulfate whisker.
The preparation method of the durable hydrophilic polypropylene separation net material comprises the following steps:
1) preparing modified magnesium sulfate whiskers: drying 5kg of magnesium sulfate whisker in a drying oven at 80 ℃ for 2 hours, putting the dried magnesium sulfate whisker into a low-speed stirrer, gradually dripping 50g of poly (propylene glycol) -silane-poly (ethylene glycol) at the temperature of 80 +/-5 ℃ and the stirring speed of 100r/min, stirring for 3 minutes after dripping, putting the stirred magnesium sulfate whisker into a heat dissipation stirring pot to be cooled to below 40 ℃ after stirring, and discharging to obtain the modified magnesium sulfate whisker for later use.
2) The preparation method of the lasting hydrophilic polypropylene separation net material comprises the following steps: weighing the raw materials according to the parts by weight, putting the weighed raw materials (not containing the modified magnesium sulfate whiskers) into a low-speed stirring pot, and stirring for 5 minutes to obtain a uniform mixture. Putting the uniform mixture into a main feeding bin of a double-screw extruder, putting the modified magnesium sulfate whiskers into a side feeding bin, measuring in a weightless balance measuring mode, setting the blanking proportion of the main feeding bin to be 97%, the blanking proportion of the side feeding bin to be 3%, the extrusion temperature to be 180-220 ℃, the rotating speed of a main machine to be 200rpm, and the blanking frequency to be 350kg/h, starting the extruder, and heating, melting, mixing, bracing, cooling and granulating the raw materials to obtain the durable hydrophilic polypropylene mesh isolating material.
Compared with the single-grade polypropylene (T30S) screen material, the tensile strength reaches 41.3MPa, the bending strength reaches 37.1MPa, the bending modulus reaches 1382MPa, and the notch impact strength reaches 4.0kJ/m2The melt index is 3.3g/10min, the water contact angle is 103 degrees, the melt index is manufactured into a separation net and then is installed in a fluid treatment component, bovine serum albumin is used as a pollutant, the water flux retention rate is 52 percent after 168 hours, and the water flux recovery rate of the fluid treatment component after pollution cleaning is 49 percent. In the embodiment, the composite modified spacer mesh material has the tensile strength of 42.0MPa, the bending strength of 39.5MPa, the bending modulus of 1624MPa and the notch impact strength of 10.0kJ/m2The melt index is 3.0g/10min, the water contact angle is reduced to 51 degrees, the melt index is manufactured into a separation net and then the separation net is installed in a fluid treatment component, bovine serum albumin is used as a pollutant, the water flux retention rate is 82% after 168 hours, and the water flux recovery rate of the fluid treatment component after pollution cleaning is 92%.
Example 2 of the invention: the preparation method of the durable hydrophilic polypropylene mesh material comprises the 94% of polypropylene T30S, 1% of acrylic copolymer P1050, 0.2% of hydrophilic agent, 3% of slow-release agent, 0.1% of traction agent, 0.5% of lubricant, 0.2% of antioxidant and 1% of modified magnesium sulfate whisker by mass fraction. The hydrophilic agent is a polyether polyol compound; the slow release agent is cellulose acetate slow release agent; the traction agent is dopamine hydrochloride; the lubricant is EBS; the antioxidant is an antioxidant 1010, and the proportion of the antioxidant 168 is 1: 1; the modified magnesium sulfate whisker is prepared by surface treatment of magnesium sulfate, the surface treating agent is maleic anhydride-styrene-COONa/N, N-dimethylacetamide (DMAc), and the dosage of the surface treating agent is 2% of the weight of the magnesium sulfate whisker.
The preparation method of the durable hydrophilic polypropylene separation net material comprises the following steps:
2) preparing modified magnesium sulfate whiskers: drying 5kg of magnesium sulfate whisker in a drying oven at 80 ℃ for 2 hours, putting the dried magnesium sulfate whisker into a low-speed stirrer, gradually dropwise adding 100g of maleic anhydride-styrene-COONa/N, N-dimethylacetamide (DMAc) at the temperature of 80 +/-5 ℃ and the stirring speed of 100r/min, stirring for 3 minutes after dropwise adding, putting the stirred magnesium sulfate whisker into a heat dissipation stirring pot, cooling to below 40 ℃, and discharging to obtain the modified magnesium sulfate whisker for later use.
2) The preparation method of the lasting hydrophilic polypropylene separation net material comprises the following steps: weighing the raw materials according to the parts by weight, putting the weighed raw materials (not containing the modified magnesium sulfate whiskers) into a low-speed stirring pot, and stirring for 5 minutes to obtain a uniform mixture. Putting the uniform mixture into a main feeding bin of a double-screw extruder, putting the modified magnesium sulfate whiskers into a side feeding bin, measuring in a weightless balance measuring mode, setting the blanking proportion of the main feeding bin to be 99%, the blanking proportion of the side feeding bin to be 1%, the extrusion temperature to be 180-220 ℃, the rotating speed of a main machine to be 200rpm, and the blanking frequency to be 350kg/h, starting the extruder, and heating, melting, mixing, bracing, cooling and granulating the raw materials to obtain the durable hydrophilic polypropylene mesh isolating material.
Compared with the single-grade polypropylene (T30S) screen material, the tensile strength reaches 41.3MPa, the bending strength reaches 37.1MPa, the bending modulus reaches 1382MPa, and the notch impact strength reaches 4kJ/m23.3g/10min, water contactThe angle is 103 degrees, the device is manufactured into a separation net and then is installed in a fluid treatment component, bovine serum albumin is used as a pollutant, the water flux retention rate is 52 percent after 168 hours, and the water flux recovery rate of the fluid treatment component after pollution cleaning is 49 percent. In the embodiment, the composite modified spacer mesh material has the tensile strength of 42.1MPa, the bending strength of 38.5MPa, the bending modulus of 1520MPa and the notch impact strength of 4.0kJ/m2The melt index is 3.2g/10min, the water contact angle is 43 degrees, the melt index is manufactured into a separation net and then is installed in a fluid treatment component, bovine serum albumin is used as a pollutant, the water flux retention rate is 88 percent after 168 hours, and the water flux recovery rate of the fluid treatment component after pollution cleaning is 94 percent.
Example 3 of the invention: the preparation method of the durable hydrophilic polypropylene mesh material comprises the following components, by mass, 60% of polypropylene MM20-S, 20% of polypropylene PPEPS30R, 10% of acrylic copolymer P1050, 0.4% of a hydrophilic agent, 2% of a slow-release agent, 2% of a traction agent, 0.2% of a lubricant, 0.4% of an antioxidant and 5% of modified magnesium sulfate whiskers. The hydrophilic agent is an ethylene-vinyl alcohol copolymer; the sustained release agent is sodium carboxymethyl cellulose gel; the traction agent is dopamine hydrochloride; the lubricant is TAF; the antioxidant is an antioxidant 1010, and the proportion of the antioxidant 168 is 1: 1; the modified magnesium sulfate whisker is prepared by surface treatment of magnesium sulfate, the surface treating agent is maleic anhydride-styrene-COONa/N, N-dimethylacetamide (DMAc), and the dosage of the surface treating agent is 3% of the weight of the magnesium sulfate whisker.
The preparation method of the durable hydrophilic polypropylene separation net material comprises the following steps:
3) preparing modified magnesium sulfate whiskers: drying 5kg of magnesium sulfate whisker in a drying oven at 80 ℃ for 2 hours, putting the dried magnesium sulfate whisker into a low-speed stirrer, gradually dropwise adding 150g of maleic anhydride-styrene-COONa/N, N-dimethylacetamide (DMAc) at the temperature of 80 +/-5 ℃ and the stirring speed of 100r/min, stirring for 3 minutes after dropwise adding, after stirring, putting the stirred magnesium sulfate whisker into a heat dissipation stirring pot, cooling to below 40 ℃, and discharging to obtain the modified magnesium sulfate whisker for later use.
2) The preparation method of the lasting hydrophilic polypropylene separation net material comprises the following steps: weighing the raw materials according to the parts by weight, putting the weighed raw materials (not containing the modified magnesium sulfate whiskers) into a low-speed stirring pot, and stirring for 5 minutes to obtain a uniform mixture. Putting the uniform mixture into a main feeding bin of a double-screw extruder, putting the modified magnesium sulfate whiskers into a side feeding bin, measuring in a weightless balance measuring mode, setting the feeding proportion of the main feeding bin to be 95%, the feeding proportion of the side feeding bin to be 5%, the extrusion temperature to be 180-220 ℃, the rotating speed of a main machine to be 200rpm, and the feeding frequency to be 350kg/h, starting the extruder, and heating, melting, mixing, bracing, cooling and granulating the raw materials to obtain the durable hydrophilic polypropylene mesh isolating material.
Compared with the single-grade polypropylene (T30S) screen material, the tensile strength reaches 41.3MPa, the bending strength reaches 37.1MPa, the bending modulus reaches 1382MPa, and the notch impact strength reaches 4kJ/m2The melt index is 3.3g/10min, the water contact angle is 103 degrees, the melt index is manufactured into a separation net and then is installed in a fluid treatment component, bovine serum albumin is used as a pollutant, the water flux retention rate is 52 percent after 168 hours, and the water flux recovery rate of the fluid treatment component after pollution cleaning is 49 percent. In the embodiment, the tensile strength of the composite modified spacer screen material is 44.0MPa, the bending strength is 42.0MPa, the bending modulus is 1730MPa, and the notch impact strength is 8.0kJ/m2The melt index is 3.5g/10min, the water contact angle is 56 degrees, the melt index is manufactured into a separation net and then is installed in a fluid treatment component, bovine serum albumin is used as a pollutant, the water flux retention rate is 87 percent after 168 hours, and the water flux recovery rate of the fluid treatment component after pollutant cleaning is 97 percent.
The separation net prepared by molding the durable hydrophilic polypropylene separation net materials prepared in the embodiments 1, 2 and 3 through a special extrusion die has the advantages of good stiffness, round and smooth surface, good corrosion resistance, obviously reduced water contact angle, long-acting hydrophilicity, and obviously improved water flux retention rate and recovery rate after being assembled into a fluid treatment part. As is clear from the examples 1, 2 and 3, the overall performance, the hydrophilic performance and the durable stain resistance of the polypropylene partition net material are obviously superior to those of a single-grade polypropylene partition net material, so that the polypropylene partition net material has excellent technical effects.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. The lasting hydrophilic polypropylene mesh material is characterized by comprising main materials and auxiliary materials, wherein the main materials comprise polypropylene (PP) resin: 73-95% of modified magnesium sulfate whisker: 1-5% of an acrylic copolymer: 1-10% of a hydrophilic agent: 0.2-1%, slow release agent: 2-12% of a traction agent: 0.1-5%; the auxiliary materials are other auxiliary agents and comprise 0.2-0.6% of lubricant and 0.2-0.6% of antioxidant in the weight of the main materials.
2. The method for preparing the durable hydrophilic polypropylene mesh material according to claim 1, wherein the polypropylene resin is one or more than two of homopolymerized PP and copolymerized PP.
3. The method for preparing the durable hydrophilic polypropylene screen material according to claim 1, wherein the hydrophilic agent is one or more of amphiphilic natural amino acid, polyether polyol compounds and ethylene-vinyl alcohol copolymers.
4. The method for preparing the durable hydrophilic polypropylene mesh material according to claim 1, wherein the sustained release agent is one or more of EAA sodium salt, sodium carboxymethyl cellulose gel, cellulose acetate sustained release agent and acetaminophen sustained release agent.
5. The method of making a durable hydrophilic polypropylene separator material of claim 1 wherein the traction agent is dopamine hydrochloride.
6. The method for preparing a durable hydrophilic polypropylene separator material according to claim 1, wherein the lubricant is one or more of stearic acid, ethylene bis fatty acid amide, calcium stearate, and modified ethylene bis fatty acid amide; the antioxidant is one or more of hindered phenol antioxidant, thiodipropionic acid diester and phosphite ester.
7. The method for preparing the durable hydrophilic polypropylene mesh material according to claim 1, wherein the modified magnesium sulfate whiskers are prepared by the following steps:
drying the magnesium sulfate whisker in a drying oven at the temperature of 80 ℃ for 2 hours, putting the dried magnesium sulfate whisker into a low-speed stirrer, gradually dropwise adding a surface treating agent at the temperature of 80 +/-5 ℃ and at the stirring speed of 50-150 r/min, stirring for 1-3 minutes after dropwise adding, putting the stirred magnesium sulfate whisker into a heat dissipation stirring pot, cooling to below 40 ℃ after stirring, and discharging to obtain the modified magnesium sulfate whisker, wherein the adding amount of the surface treating agent is 1-3% of the mass of the magnesium sulfate whisker.
8. The method of claim 7, wherein the surface treatment agent is one or more of poly (propylene glycol) -silane-poly (ethylene glycol), poly [ poly (ethylene glycol methacrylate) -b-poly (methyl methacrylate) -b-poly [ poly (ethylene glycol methacrylate) ], maleic anhydride-styrene-COONa/N, N-dimethylacetamide (DMAc) amphiphilic polymers.
9. A durable hydrophilic polypropylene partition net material and a preparation method thereof are characterized by comprising the following steps:
step 1), putting the main material and the auxiliary material into a low-speed stirring pot, and stirring for 2-5 minutes to obtain a uniform mixture; the main material and the auxiliary material comprise polypropylene (PP) resin: 73-95% of an acrylic copolymer: 1-10% of a hydrophilic agent: 0.2-1%, slow release agent: 2-12% of a traction agent: 0.1-5%; the auxiliary materials are other auxiliary agents and comprise 0.2-0.6% of lubricant and 0.2-0.6% of antioxidant in weight of the main materials; and 2) putting the uniform mixture into a main feeding bin of a double-screw extruder, putting the modified magnesium sulfate whiskers into a side feeding bin, measuring by adopting a weightlessness balance measuring mode, wherein the blanking proportion of the uniform mixture is 95-99%, the blanking proportion of the modified magnesium sulfate whiskers is 1-5%, the extrusion temperature is 180-220 ℃, the rotating speed of a main machine is 200-400 rpm, and heating, melting, mixing, bracing, cooling and granulating to obtain the durable hydrophilic polypropylene spacer mesh material.
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