CN112646273A - Polypropylene composite material with high light transmittance, hydrolysis resistance, antibiosis and mildew resistance and preparation method thereof - Google Patents
Polypropylene composite material with high light transmittance, hydrolysis resistance, antibiosis and mildew resistance and preparation method thereof Download PDFInfo
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- CN112646273A CN112646273A CN202011530473.4A CN202011530473A CN112646273A CN 112646273 A CN112646273 A CN 112646273A CN 202011530473 A CN202011530473 A CN 202011530473A CN 112646273 A CN112646273 A CN 112646273A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
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- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts
Abstract
The invention relates to a polypropylene composite material with high transmittance, hydrolysis resistance, antibiosis and mildew resistance and a preparation method thereof, and the polypropylene composite material is composed of the following raw materials in parts by weight: 30-70 parts of metallocene polypropylene resin, 5-20 parts of bimodal polyethylene resin, 2-15 parts of modified two-dimensional layered inorganic filler and 0.5-3 parts of efficient antibacterial agent; the invention has the advantages that: aiming at the inherent defects that the conventional antibacterial material is not waterproof and has poor dimensional stability, the inorganic filler with a two-dimensional layered structure is preferably selected, and the antistatic modification is carried out, so that the stable electrostatic adsorption acting force is applied between the inorganic filler and the metal ion antibacterial agent, and the problems that the antibacterial agent is easy to migrate and hydrolyze and lose efficacy under the complicated damp and hot working conditions are solved. The antibacterial polypropylene composite material prepared by the invention has good transmittance, and has extremely excellent antibacterial and anti-mildew performance in a harsh environment of high temperature and high humidity (95 ℃, 100% RH) and long-term water immersion.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to a polypropylene composite material with high light transmittance, hydrolysis resistance, bacteria resistance and mildew resistance and a preparation method thereof.
Background
In recent years, with the continuous development and improvement of modern society and living standard, the concept of green, environmental protection and healthy living continues to be deeply mastered, and the requirement of people on the health degree of working and living environments is higher and higher, which puts a brand new demand on the high performance and high functionality of the current polymer materials, and the antibacterial plastics are a typical example of the functionalized polymer materials.
The general plastic is prepared by Polymerizing Polypropylene (PP) with nonpolar propylene monomer, and has the main characteristics of good comprehensive performance, easy processing, good environmental resistance and chemical resistance and low cost, and because of the increasing updating of polymerization process level and catalytic system in recent years, some polypropylene types with brand new structures and special properties begin to appear and be popularized and applied, metallocene polypropylene is a novel polypropylene which takes metallocene as a catalyst, has adjustable molecular chain structure height and good controllability of aggregation state structure, and has multi-block aggregation state structures such as homopolymerization propylene, random copolymerization and the like, thereby endowing the material with high stability, light transmittance and processability fluidity, and being one of ideal matrix materials of the current novel antibacterial material.
However, most of the existing antibacterial polypropylene modification technical solutions focus on improving the antibacterial performance of the material, and the antibacterial polypropylene material described in CN103059405B realizes the sterilization rate of more than 98% for escherichia coli and staphylococcus aureus by adding natural antibacterial agent-chitosan and synthetic antibacterial agent-polyhexamethylene guanidine phosphate for compounding; CN103772822B adopts a synthesized silver ion antibacterial agent to realize the sterilization rate of 90 percent on escherichia coli and staphylococcus aureus; the technical scheme does not relate to the long-term stability of the antibacterial material, especially the evaluation of the antibacterial stability under complex working conditions such as high temperature, high humidity and boiling. CN103772807B also considers the improvement of hydrophilicity of the antibacterial polypropylene material while improving antibacterial performance, but whether the improvement helps antibacterial stability in a damp and hot environment is not known yet; the long-acting broad-spectrum antibacterial polypropylene material described in CN101520250B and the preparation method thereof do not provide clear judgment basis and test result for long-acting performance evaluation of antibacterial. Therefore, the improvement on the hydrolysis resistance stability and the long-term antibacterial and anti-mildew performance of the antibacterial polypropylene material has important research significance and popularization value for expanding the application field of the antibacterial material.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a polypropylene composite material with high light transmittance, hydrolysis resistance, bacteria resistance and mildew resistance, aiming at the inherent limitation that most of the existing antibacterial polypropylene materials focus on short-term (24h) antibacterial property, novel metallocene polypropylene and bimodal polyethylene are used as composite base materials, and a high-efficiency antibacterial agent is compounded with a modified two-dimensional layered inorganic filler, so that an antibacterial filling system with uniform dispersion and stable performance is obtained, and the short-term (24h) and long-term (300h) antibacterial mildew resistance stability of the material is very obvious while the obtained polypropylene composite material has high light transmittance.
The purpose of the invention is realized by the following technical scheme:
a polypropylene composite material with high light transmittance, hydrolysis resistance, bacteria resistance and mildew resistance comprises the following raw materials in parts by weight:
furthermore, the metallocene polypropylene resin is elastic stereoblock polypropylene which takes metallocene as a polymerization catalyst and has isotactic/atactic two blocks, the melt flow rate MFR of the metallocene polypropylene resin is 2-30g/10min under the conditions of 230 ℃ and 2.16kg, and the light transmittance is more than or equal to 80 percent according to the ISO13468 method.
Furthermore, the bimodal polyethylene has high-performance polyethylene resin with high molecular weight and low molecular weight, the melt flow rate MFR of the high-performance polyethylene resin is 0.2-2g/10min under the conditions of 190 ℃ and 2.16kg, and the light transmittance is more than or equal to 70% according to the ISO13468 method.
Furthermore, the high-efficiency antibacterial agent is one or more of an organic antibacterial agent, a metal ion antibacterial agent and the like.
Further, the auxiliary dispersant is pentaerythritol stearate lubricant (PETS).
Further, the modification method of the two-dimensional layered inorganic filler comprises the following steps: weighing 2-15 parts of two-dimensional layered inorganic filler, and immersing inorganic powder into 500ml of 1mol.L under the protection of nitrogen-1And (2) performing magnetic stirring reaction on the isobutyl lithium in a cyclohexane solution for 48 hours, precipitating, washing and drying a reaction product, then putting the product into an aqueous solution of sodium octadecyl toluenesulfonate with the solid content of 55-65% under the action of ultrasonic dispersion, wherein the ultrasonic power is 52w, the ultrasonic time is 60min, and the frequency is 50Hz to obtain an amphiphilic two-dimensional layered inorganic filler stable suspension, and filtering, washing and drying the suspension after stopping ultrasonic treatment to obtain the modified two-dimensional layered inorganic filler.
Further, the two-dimensional layered inorganic filler is one or more of nano kaolin, nano montmorillonite, nano graphene microchip and the like.
The second purpose of the invention is to provide a preparation method of a polypropylene composite material with high light transmittance, hydrolysis resistance, bacteria resistance and mildew resistance, which comprises the following steps:
(1) weighing metallocene polypropylene resin and bimodal polyethylene resin according to the weight parts, and uniformly mixing to obtain a mixed raw material A; weighing the modified two-dimensional layered inorganic filler and the high-efficiency antibacterial agent according to the weight parts, and uniformly mixing to obtain a mixed raw material B;
(2) placing the dried mixed raw material A into a main feeding bin of a double-screw extruder which is tightly meshed and rotates in the same direction, adding the dried mixed raw material A into a machine barrel of the extruder through a feeding screw, placing the dried mixed raw material B into a side feeding bin, adding the dried mixed raw material B into the extruder from a side feeding port through the feeding screw, wherein the diameter of a screw rod of the extruder is 35mm, the length-diameter ratio L/D is 48, and the temperature of each subarea of the main machine barrel from the feeding port to a machine head outlet is set as follows: 120 ℃, 160 ℃, 170 ℃, 185 ℃, 190 ℃, 180 ℃ and the rotation speed of a main engine is 250 revolutions per minute, and the product is obtained after the processes of melt extrusion, cooling, granulation, drying treatment and the like.
Compared with the prior art, the invention has the following beneficial effects:
1. the scheme of the invention adopts the composite base material with a specific structure, wherein the metallocene polypropylene has good transmittance, rigidity, solvent resistance and chemical resistance, the low molecular weight part in the bimodal polyethylene endows the material with internal lubrication characteristic, the antibacterial agent is prevented from decomposing and losing efficacy due to excessive shearing in the melting processing process, and the high molecular weight part plays a role in interfacial compatibilization of an antibacterial system and the metallocene polypropylene, thereby playing a role in assisting in improving the effects of long-acting antibiosis and mildew resistance.
2. The long-acting antibacterial and anti-mildew effect in the scheme of the invention is realized mainly by the multiphase compounding use of high-efficiency antibacterial agents with different types and mechanisms and modified two-dimensional layered inorganic fillers. The modified inorganic filler has amphipathy (hydrophilcity and lipophilicity), can form good fixed adsorption with polar antibacterial agent molecules through electrostatic acting force, and has lipophilicity (namely nonpolar) matched with the characteristics of polypropylene and polyethylene nonpolar materials, so that the phenomena of migration, hydrolysis and failure of the antibacterial agent molecules in a complex working condition environment are greatly reduced; in addition, different antibacterial agents have advantages in sterilization, mildew prevention and the like, and ideal antibacterial and mildew prevention effects can be obtained by compounding the antibacterial agents in proportion. The combined action of the above two factors ensures the long-term stability of the obtained antibacterial material.
3. The polypropylene composite material obtained according to the technical scheme provided by the invention has obviously improved conventional physical indexes such as bending strength, modulus and heat distortion temperature compared with the conventional scheme, wherein the heat distortion temperature is improved from 95 ℃ to about 110 ℃, and the transmittance of the obtained material is not obviously reduced; in the aspect of key short-term and long-term antibacterial performance, although the scheme of the invention is closer to the conventional scheme in the aspect of short-term (24h) antibacterial performance, in the harsh environment of high temperature, high humidity (95 ℃, 100% RH) and long-term water immersion (1000h), the antibacterial polypropylene material by the index of the scheme of the invention still ensures the sterilization rate of more than 90% to escherichia coli and staphylococcus aureus, the mildew-proof grade of the material is still maintained at 0 grade with strong mildew-proof effect, and the excellent long-term and broad-spectrum antibacterial mildew-proof effect is shown.
Detailed Description
The invention is further illustrated by the following specific examples, which are intended to be illustrative only and not limiting.
The raw materials used in the embodiment of the invention are as follows:
metallocene Polypropylene resin EM248U, Liandersba industries, 230 ℃, 2.16kg, melt index MFR 24g/10min, transmittance 89% according to ISO 13468.
7000F, China petrochemical Yanshan division, 190 ℃, 2.16kg, the melt index MFR is 0.35g/10min, the light transmission is 75% according to ISO 13468.
Two-dimensional layered inorganic filler-1: nanometer montmorillonite DK2, Zhejiang Fenghong New Material Co., Ltd, radial width of 2-10um, lamella thickness of 10-25nm, XRD d001 of 2.4 nm.
Two-dimensional layered inorganic filler-2: the graphene microchip has the radial width of 10-25um, the thickness of a sheet layer of 2-10nm and the XRD d001 of 5.8 nm. Shanghai Happy carbon Co., Ltd.
High-efficiency antibacterial agent-1: organic antimicrobial agent-isothiazolinone derivative DCOIT, dahliang jietixin crop science ltd.
High-efficiency antibacterial agent-2: silver ion antibacterial agent R75000-025, Guangzhou trihydrate chemical Co.
High-efficiency antibacterial agent-3: a compound zinc salt antibacterial agent, China petrochemical Beijing chemical research institute.
And (3) product performance testing:
bending property: the test was carried out in accordance with ISO 178 standard test method on a Germany ZWICK BTCFR0C0TH.A50 universal tensile testing machine, with a sample bar size of 80X 10X 4mm, at normal temperature (23 ℃).
Heat distortion temperature: the test was carried out on a vicat-thermomechanical tester, model ceastht 6921, italy, according to the ISO 75-2 standard method, under the following conditions: 0.45MPa, 120 ℃/h.
And (3) testing the transmittance: discs of size phi 80X 4mm were injection moulded according to the standard method indicated in ISO13468 standard, on a WGT-S light transmittance/haze tester.
Antibacterial performance test (24 h): according to the standard method shown in GB/T31402, the test is carried out on the surface of a sample plate with the thickness of 50 multiplied by 3.2mm under the standard environment with the temperature of 23 ℃ and the RH of 50 percent, and the test strains are respectively escherichia coli and golden yellow staphylococcus.
Mildew resistance rating test (24 h): the test was carried out on a sample surface of 50X 3.2mm in a standard environment of 50% RH at 23 ℃ according to the standard method shown in QB/T2591, and the test strain was Aspergillus niger. Grade 0 indicates a strong anti-mildew effect, grade 1 indicates a general anti-mildew effect, and grade 2 indicates no anti-mildew effect.
Damp and hot environment antibacterial performance test (95 ℃, 100%, 24 h): storing a standard sample plate with the size of 50 multiplied by 3.2mm in a damp and hot environment with the temperature of 95 ℃ and the RH of 100 percent for 24 hours, and testing the antibacterial rate of the sample plate to escherichia coli and golden yellow grape bacteria according to the standard method of GB/T31402 after the completion.
Mildew resistance rating test (1000h, water immersion): placing a standard sample of 50 × 50 × 3.2mm in a constant temperature water bath, storing at 23 deg.C for 1000 hr, taking out, and testing the anti-mildew grade by standard method shown by QB/T2591 to obtain Aspergillus niger.
Example 1
Weighing metallocene polypropylene resin and bimodal polyethylene resin according to the weight parts in the example 1 in the table 1, and uniformly mixing to obtain a mixed raw material A; and weighing the modified two-dimensional layered inorganic filler and the high-efficiency antibacterial agent in parts by weight, and uniformly mixing to obtain a mixed raw material B.
Placing the dried mixed raw material A into a main feeding bin of a double-screw extruder which is tightly meshed and rotates in the same direction, adding the dried mixed raw material A into a machine barrel of the extruder through a feeding screw, placing the dried mixed raw material B into a side feeding bin, adding the dried mixed raw material B into the extruder from a side feeding port through the feeding screw, wherein the diameter of a screw rod of the extruder is 35mm, the length-diameter ratio L/D is 48, and the temperature of each subarea of the main machine barrel from the feeding port to a machine head outlet is set as follows: 120 ℃, 160 ℃, 170 ℃, 185 ℃, 190 ℃, 180 ℃ and the rotation speed of a main engine is 250 revolutions per minute, and the product is obtained after the processes of melt extrusion, cooling, granulation, drying treatment and the like.
TABLE 1 formula table (unit: gram) of polypropylene composite material with high light transmittance, hydrolysis resistance, antibacterial and anti-mildew
Example 2
Weighing metallocene polypropylene resin and bimodal polyethylene resin according to the weight parts in the example 2 in the table 1, and uniformly mixing to obtain a mixed raw material A; and weighing the modified two-dimensional layered inorganic filler and the high-efficiency antibacterial agent in parts by weight, and uniformly mixing to obtain a mixed raw material B.
Placing the dried mixed raw material A into a main feeding bin of a double-screw extruder which is tightly meshed and rotates in the same direction, adding the dried mixed raw material A into a machine barrel of the extruder through a feeding screw, placing the dried mixed raw material B into a side feeding bin, adding the dried mixed raw material B into the extruder from a side feeding port through the feeding screw, wherein the diameter of a screw rod of the extruder is 35mm, the length-diameter ratio L/D is 48, and the temperature of each subarea of the main machine barrel from the feeding port to a machine head outlet is set as follows: 120 ℃, 160 ℃, 170 ℃, 185 ℃, 190 ℃, 180 ℃ and the rotation speed of a main engine is 250 revolutions per minute, and the product is obtained after the processes of melt extrusion, cooling, granulation, drying treatment and the like.
Example 3
Weighing metallocene polypropylene resin and bimodal polyethylene resin according to the weight parts in the example 3 in the table 1, and uniformly mixing to obtain a mixed raw material A; and weighing the modified two-dimensional layered inorganic filler and the high-efficiency antibacterial agent in parts by weight, and uniformly mixing to obtain a mixed raw material B.
Placing the dried mixed raw material A into a main feeding bin of a double-screw extruder which is tightly meshed and rotates in the same direction, adding the dried mixed raw material A into a machine barrel of the extruder through a feeding screw, placing the dried mixed raw material B into a side feeding bin, adding the dried mixed raw material B into the extruder from a side feeding port through the feeding screw, wherein the diameter of a screw rod of the extruder is 35mm, the length-diameter ratio L/D is 48, and the temperature of each subarea of the main machine barrel from the feeding port to a machine head outlet is set as follows: 120 ℃, 160 ℃, 170 ℃, 185 ℃, 190 ℃, 180 ℃ and the rotation speed of a main engine is 250 revolutions per minute, and the product is obtained after the processes of melt extrusion, cooling, granulation, drying treatment and the like.
Example 4
Weighing metallocene polypropylene resin and bimodal polyethylene resin according to the weight parts in the example 4 in the table 1, and uniformly mixing to obtain a mixed raw material A; and weighing the modified two-dimensional layered inorganic filler and the high-efficiency antibacterial agent in parts by weight, and uniformly mixing to obtain a mixed raw material B.
Placing the dried mixed raw material A into a main feeding bin of a double-screw extruder which is tightly meshed and rotates in the same direction, adding the dried mixed raw material A into a machine barrel of the extruder through a feeding screw, placing the dried mixed raw material B into a side feeding bin, adding the dried mixed raw material B into the extruder from a side feeding port through the feeding screw, wherein the diameter of a screw rod of the extruder is 35mm, the length-diameter ratio L/D is 48, and the temperature of each subarea of the main machine barrel from the feeding port to a machine head outlet is set as follows: 120 ℃, 160 ℃, 170 ℃, 185 ℃, 190 ℃, 180 ℃ and the rotation speed of a main engine is 250 revolutions per minute, and the product is obtained after the processes of melt extrusion, cooling, granulation, drying treatment and the like.
Example 5
Weighing metallocene polypropylene resin and bimodal polyethylene resin according to the weight parts in the example 5 in the table 1, and uniformly mixing to obtain a mixed raw material A; and weighing the modified two-dimensional layered inorganic filler and the high-efficiency antibacterial agent in parts by weight, and uniformly mixing to obtain a mixed raw material B.
Placing the dried mixed raw material A into a main feeding bin of a double-screw extruder which is tightly meshed and rotates in the same direction, adding the dried mixed raw material A into a machine barrel of the extruder through a feeding screw, placing the dried mixed raw material B into a side feeding bin, adding the dried mixed raw material B into the extruder from a side feeding port through the feeding screw, wherein the diameter of a screw rod of the extruder is 35mm, the length-diameter ratio L/D is 48, and the temperature of each subarea of the main machine barrel from the feeding port to a machine head outlet is set as follows: 120 ℃, 160 ℃, 170 ℃, 185 ℃, 190 ℃, 180 ℃ and the rotation speed of a main engine is 250 revolutions per minute, and the product is obtained after the processes of melt extrusion, cooling, granulation, drying treatment and the like.
Example 6
Weighing metallocene polypropylene resin and bimodal polyethylene resin according to the weight parts in the example 5 in the table 1, and uniformly mixing to obtain a mixed raw material A; and weighing the modified two-dimensional layered inorganic filler and the high-efficiency antibacterial agent in parts by weight, and uniformly mixing to obtain a mixed raw material B.
Placing the dried mixed raw material A into a main feeding bin of a double-screw extruder which is tightly meshed and rotates in the same direction, adding the dried mixed raw material A into a machine barrel of the extruder through a feeding screw, placing the dried mixed raw material B into a side feeding bin, adding the dried mixed raw material B into the extruder from a side feeding port through the feeding screw, wherein the diameter of a screw rod of the extruder is 35mm, the length-diameter ratio L/D is 48, and the temperature of each subarea of the main machine barrel from the feeding port to a machine head outlet is set as follows: 120 ℃, 160 ℃, 170 ℃, 185 ℃, 190 ℃, 180 ℃ and the rotation speed of a main engine is 250 revolutions per minute, and the product is obtained after the processes of melt extrusion, cooling, granulation, drying treatment and the like.
Comparative example 1
Weighing the metallocene polypropylene resin and the bimodal polyethylene resin according to the weight parts in the comparative example 1 in the table 1, and uniformly mixing to obtain a mixed raw material A.
Placing the dried mixed raw material A into a main feeding bin of a double-screw extruder which is tightly meshed and rotates in the same direction, adding the dried mixed raw material A into a machine barrel of the extruder through a feeding screw, placing a high-efficiency antibacterial agent into a side feeding bin, adding the high-efficiency antibacterial agent into the extruder from a side feeding port through the feeding screw, wherein the diameter of the screw of the extruder is 35mm, the length-diameter ratio L/D is 48, and the temperature of each subarea of the main machine barrel from the feeding port to a machine head outlet is set as follows: 120 ℃, 160 ℃, 170 ℃, 185 ℃, 190 ℃, 180 ℃ and the rotation speed of a main engine is 250 revolutions per minute, and the product is obtained after the processes of melt extrusion, cooling, granulation, drying treatment and the like.
Comparative example 2
An antibacterial polypropylene material BJ750, available from Korea Dall company.
TABLE 2 test results for high transmittance, hydrolysis resistance, antibacterial, and anti-mold polypropylene composites
From the material test data of each example and comparative example in table 2, since polypropylene and polyethylene as the base material do not have antibacterial property, the key factor of the antibacterial modification effect of the material is also the kind and dispersion distribution of the antibacterial agent used. Compared with the antibacterial and mildewproof properties under the conventional conditions and in a short period (24h), the differences between the examples and the comparative examples 1 and 2 are not obvious, although the antibacterial rates of the examples 2 to 6 are generally kept to be more than 95%, the data of the comparative examples 1 and 2 are basically similar, the mildewproof effect is on the mildewproof grade, and the strong mildewproof effect (grade 0) of the comparative example 1 is kept to be the same as that of the examples 1, 4 and 6; then, along with the change of the test environment conditions, in an extreme high-temperature and high-humidity environment (95 ℃, 100% RH), due to the lack of a necessary protective structure, the migration and failure phenomena of the antibacterial agents in the comparative examples 1 and 2 are very serious, the antibacterial rate is reduced to below 85%, and the anti-mildew grade is further reduced to a level 2 without anti-mildew effect after long-term (1000h) water immersion; in contrast, in each embodiment, the molecules of the antibacterial agent are well protected due to the adsorption and solidification effects of the modified two-dimensional layered inorganic filler, so that excessive migration, hydrolysis and failure are avoided, especially in embodiments 4 and 6, due to the good width-thickness ratio of the graphene microchip structure and the large interlayer pores, the adsorption and solidification effects are more and more obvious, the antibacterial rate of the obtained material on escherichia coli and staphylococcus aureus is still maintained above 90% after the obtained material is subjected to a severe test environment, and the long-term anti-mildew grade is still maintained at a level of 0.
It is worth noting that such improvement of the antibacterial and mildewproof properties does not excessively reduce the self light transmittance of the obtained polypropylene composite material, the light transmittance of the material in example 6 is still at a higher level of 80%, which is similar to that of comparative examples 1 and 2, and due to the addition of a certain proportion of inorganic filler, the rigidity (flexural modulus) and the heat resistance (thermal deformation temperature) of the material are improved to different degrees, which indicates that the modified polypropylene composite material obtained by the scheme of the present invention has excellent balance in three aspects of high light transmittance, hydrolysis resistance, antibacterial and mildewproof properties, etc., and the synergistic improvement of the above properties is achieved, so that the application field and the practical value of the obtained modified material are greatly expanded.
Claims (7)
1. A polypropylene composite material with high light transmittance, hydrolysis resistance, antibiosis and mildew resistance is characterized in that: the feed comprises the following raw materials in parts by weight:
2. the high optical transparency, hydrolysis resistant, antibacterial and anti-mildew polypropylene composite material as claimed in claim 1, wherein: the metallocene polypropylene resin is elastic stereoblock polypropylene which takes metallocene as a polymerization catalyst and has isotactic/atactic two blocks, the melt flow rate MFR is 2-30g/10min when the metallocene polypropylene resin is tested under the conditions of 230 ℃ and 2.16kg, and the light transmittance is more than or equal to 80 percent when the metallocene polypropylene resin is tested according to an ISO13468 method.
3. The high optical transparency, hydrolysis resistant, antibacterial and anti-mildew polypropylene composite material as claimed in claim 1, wherein: the bimodal polyethylene has high-performance polyethylene resin with high molecular weight and low molecular weight, the melt flow rate MFR of the bimodal polyethylene is 0.2-2g/10min when the bimodal polyethylene is tested at 190 ℃ under the condition of 2.16kg, and the light transmittance is more than or equal to 70% when the bimodal polyethylene is tested according to the method of ISO 13468.
4. The high optical transparency, hydrolysis resistant, antibacterial and anti-mildew polypropylene composite material as claimed in claim 1, wherein: the high-efficiency antibacterial agent is one or more of an organic antibacterial agent, a metal ion antibacterial agent and the like.
5. The high optical transparency, hydrolysis resistant, antibacterial and anti-mildew polypropylene composite material as claimed in claim 1, wherein: the modification method of the two-dimensional layered inorganic filler comprises the following steps: weighing 2-15 parts of two-dimensional layered inorganic filler, and immersing inorganic powder into 500ml of 1mol.L under the protection of nitrogen-1And (2) performing magnetic stirring reaction on the isobutyl lithium in a cyclohexane solution for 48 hours, precipitating, washing and drying a reaction product, then putting the product into an aqueous solution of sodium octadecyl toluenesulfonate with the solid content of 55-65% under the action of ultrasonic dispersion, wherein the ultrasonic power is 52w, the ultrasonic time is 60min, and the frequency is 50Hz to obtain an amphiphilic two-dimensional layered inorganic filler stable suspension, and filtering, washing and drying the suspension after stopping ultrasonic treatment to obtain the modified two-dimensional layered inorganic filler.
6. The polypropylene composite material with high light transmittance, hydrolysis resistance, bacteria resistance and mildew resistance as claimed in claim 5 and the preparation method thereof, characterized in that: the two-dimensional layered inorganic filler is one or more of nano kaolin, nano montmorillonite, nano graphene microchip and the like.
7. A process for preparing a high optical transparency, hydrolysis resistant, antibacterial and anti-mildew polypropylene composite as claimed in any one of claims 1 to 6, characterized in that it comprises the following steps:
(1) weighing metallocene polypropylene resin and bimodal polyethylene resin according to the weight parts, and uniformly mixing to obtain a mixed raw material A; weighing the modified two-dimensional layered inorganic filler and the high-efficiency antibacterial agent according to the weight parts, and uniformly mixing to obtain a mixed raw material B;
(2) placing the dried mixed raw material A into a main feeding bin of a double-screw extruder which is tightly meshed and rotates in the same direction, adding the dried mixed raw material A into a machine barrel of the extruder through a feeding screw, placing the dried mixed raw material B into a side feeding bin, adding the dried mixed raw material B into the extruder from a side feeding port through the feeding screw, wherein the diameter of a screw rod of the extruder is 35mm, the length-diameter ratio L/D is 48, and the temperature of each subarea of the main machine barrel from the feeding port to a machine head outlet is set as follows: 120 ℃, 160 ℃, 170 ℃, 185 ℃, 190 ℃, 180 ℃ and the rotation speed of a main engine is 250 revolutions per minute, and the product is obtained after the processes of melt extrusion, cooling, granulation, drying treatment and the like.
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