Adsorptive gloss-enhancing masterbatch and method for its production

Abstract

The present application relates to the technical field of high polymer material, in particular to a luster master batch and a preparation method thereof, which comprises the following components in parts by mass: 10-50 parts of porous polymer carrier, 10-50 parts of metal nanowire, 10-50 parts of solvent and 1-5 parts of surfactant. The polymer substrate is first processed by a supercritical fluid pore-making process, and a porous polymer carrier with a connected three-dimensional network structure is prepared by controlling the process conditions, so that it can have sufficient internal space to adsorb the modification liquid. Then the metal nanowire is dispersed in the solvent and adsorbed and encapsulated into the carrier by capillary action to prepare an adsorption type enhanced luster master batch. The adsorption type enhanced luster master batch has high effective content, and the metal luster agent is pre-dispersed into the polymer phase, which is easier to disperse uniformly.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, specifically to a gloss masterbatch and its preparation method. Background Technology

[0002] Plastics are widely used in various fields, and people have increasingly higher requirements for the quality of plastic products. They demand not only good internal quality but also high-quality appearance. Surface gloss of plastic products has thus become quite important, especially in the home appliance industry. To achieve high gloss on plastic surfaces, spraying is commonly used. However, spraying generates VOCs, which is inconsistent with current green and environmentally friendly development trends. Furthermore, plastic surfaces prepared using spraying processes tend to peel off over time, affecting product performance. Spray-free technology achieves high gloss on plastic product surfaces by adding gloss masterbatches to polymers. Due to its green, environmentally friendly, and efficient process, it has become one of the hottest technologies being developed in the modified plastics industry.

[0003] Gloss masterbatch, as a functional masterbatch, improves the overall performance of plastics while significantly enhancing their surface gloss, resulting in high-performance, high-gloss plastic products. Currently, gloss masterbatch is prepared by surface modification of metal powder with coupling agents, followed by melt blending, extrusion, and granulation with a polymer matrix. During melt blending, the metallic gloss agent undergoes high-temperature shearing, and the surfactant adsorbed on the metal surface is prone to oxidation and other reactions, leading to a decline in the metal's gloss. Furthermore, melt blending results in a relatively low effective content of gloss agent in the masterbatch, as excessively high concentrations drastically increase the viscosity of the polymer melt, making extrusion impossible. Currently, to increase the effective concentration of gloss agent and avoid its failure due to high-temperature surface processing, the surface of the metallic powder gloss agent is directly modified before being added to the raw materials for blending. However, the significant density difference between metal powder and plastic granules leads to uneven feeding due to gravity settling during mixing. Therefore, a feasible solution for preparing high-concentration, easily dispersible gloss agent masterbatches remains unavailable. Summary of the Invention

[0004] The technical problem this invention aims to solve is that existing technologies for preparing gloss masterbatches suffer from low effective content, uneven dispersion, and poor gloss durability. This invention first uses a supercritical fluid pore-forming process to prepare a porous polymer carrier with a connected three-dimensional network structure, allowing sufficient internal space to adsorb the modified liquid. Then, metal nanowires are dispersed in a solvent and adsorbed and encapsulated within the carrier through capillary action, thus preparing an adsorbent-type gloss-enhancing masterbatch. This adsorbent-type gloss-enhancing masterbatch has a high effective content, and the pre-dispersed metallic gloss agent is more easily and evenly dispersed in the polymer phase. Furthermore, surface carboxyl and amination treatments effectively increase the loading strength of the metal nanowires in the masterbatch, thereby improving the durability of the resulting material.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an adsorption-type gloss-enhancing masterbatch, comprising the following components by weight:

[0006] 10-50 parts porous polymer carrier, 10-50 parts metal nanowires, 10-50 parts solvent and 1-5 parts surfactant;

[0007] The porous polymer carrier is prepared using a supercritical fluid pore-forming process, has a through-pore structure, a porosity greater than 90%, and a pore size of 10-200 μm; the metal nanowire has an aspect ratio of 100-30000.

[0008] Preferably, the method for preparing the porous polymer support includes the following steps:

[0009] S1: Add the polymer to the reactor and heat it to a molten state;

[0010] S2: The pore-forming agent is heated and pressurized to a supercritical fluid state, and injected into the reactor according to the mass ratio for sealed diffusion to obtain a melt blend;

[0011] S3: Cool and depressurize the reactor to obtain a porous polymer carrier.

[0012] Preferably, the mass ratio of the pore-forming agent to the polymer is 0.01%-10%; the pressure inside the vessel during the sealing diffusion is 5-15 MPa, and the sealing diffusion time is 3-5 hours; the final cooling temperature is 20-40℃, and the depressurization rate is 5-15 MPa / min.

[0013] Preferably, the polymer is any one or a combination of polyethylene, polypropylene, polystyrene, and EVA; and the porogen is any one of carbon dioxide, nitrogen, and ethanol.

[0014] Preferably, the polypropylene refers to carboxylated polypropylene, and its preparation method includes the following steps:

[0015] S1: Weigh polypropylene powder and nitric acid at a mass ratio of 1:2-5, and stir to react and obtain a mixture;

[0016] S2: After cooling, washing and drying the mixture, carboxylated polypropylene is obtained.

[0017] Preferably, the metal nanowires are any one of silver nanowires, copper nanowires, and titanium dioxide nanowires, wherein the copper nanowires refer to surface-aminated copper nanowires, and the preparation method includes the following steps:

[0018] S1: Weigh out nano-copper oxide, suspend it in an ethanol solution, sonicate it, and then heat it to obtain a mixture;

[0019] S2: Add ammonia and tetraethyl orthosilicate to the mixture, react, age, and wash with water to obtain CuO / SiO2 nanoparticles;

[0020] S3: The obtained CuO / SiO2 nanoparticles were dispersed in a chitosan solution, and after acoustic degradation, sodium tripolyphosphate solution was added and stirred to react.

[0021] S4: The product after stirring and reaction is separated, washed with water, and vacuum dried to obtain copper nanowires with surface amination.

[0022] Preferably, the mass percentage of the nano-copper oxide is 0.5%-5%, the ultrasonic time is 0.5-1.5 h, the final heating temperature is 50-70 °C, the heating also requires vigorous stirring and is carried out under N2 protection, the volume ratio of ammonia to tetraethyl orthosilicate is 1:1-2, the reaction time in S2 is 5-8 h, and the aging time is 1-3 h; the mass percentage of chitosan in the chitosan solution is 1-5 wt%, the ultrasonic degradation time is 10-30 min, the concentration of the sodium tripolyphosphate solution is 0.02-0.1 M, the volume is 80-120 ml, and the stirring reaction time is 10-15 h.

[0023] Preferably, the solvent is any one or a combination of water, ethanol, and isopropanol, and the surfactant is any one or a combination of sodium dodecyl sulfonate, polyvinylpyrrolidone, alkylphenol polyoxyethylene ether, and polysorbate.

[0024] Preferably, the preparation method of the adsorption-type gloss-enhancing masterbatch includes the following steps:

[0025] S1: Add the surfactant to the solvent and disperse it evenly to obtain a mixture;

[0026] S2: Add the metal nanowires to the mixture obtained in S1 and sonicate to obtain a metal nanowire dispersion;

[0027] S3: Add the metal nanowire dispersion to the porous polymer carrier and stir evenly to obtain an adsorption-type gloss-enhancing masterbatch.

[0028] Preferably, the ultrasonic oscillation time is 5-20 min and the power is 500-1000 W; the stirring time in S3 is 20-40 min.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0030] (1) The adsorption-type gloss-enhancing masterbatch of the present invention has a simple preparation process, saves energy, and is green and environmentally friendly. The masterbatch prepared by adsorption using a porous carrier has a high effective content and can achieve the effect of micro-filling high performance in application, which has good economic benefits. In addition, the masterbatch prepared by the porous carrier adsorption process does not require high-temperature shearing processing, has low energy consumption, and avoids problems such as the fading of metallic gloss caused by high-temperature shearing processing.

[0031] (2) Adsorbed gloss-enhancing masterbatch can achieve homogeneous dispersion at multiple scales, improving product performance. First, the metallic gloss agent is pre-dispersed at the nanoscale to avoid entanglement of metal nanowires due to their high surface energy, preventing uniform dispersion in the polymer phase. Second, at the mesoscale, the metallic gloss agent is adsorbed into the microporous structures of the carrier, achieving initial dispersion of the metallic gloss agent in the polymer phase and avoiding agglomeration and uneven dispersion due to the large difference in physical properties between the metallic gloss agent and the polymer. At the macroscale, the metallic gloss agent is adsorbed in a low-density porous carrier, reducing the density difference between the metallic gloss agent and the plastic particles, preventing the metal from settling to the bottom of the silo due to its high density, thus avoiding uneven mixing of raw materials.

[0032] (3) Adsorption-type gloss-enhancing masterbatch can improve the modulus of plastic products. Adsorption-type reinforcing masterbatch uses metal nanowires with a certain aspect ratio, which can effectively improve the modulus of the plastic matrix. It is especially suitable for lightweight plastic products, achieving the effect of thin walls and high rigidity.

[0033] (4) Adsorption-type gloss-enhancing masterbatch can achieve a deodorizing effect during processing. The solvent boiling point in the metal nanowire dispersion adsorbed by the adsorption-type masterbatch is within the plastic processing temperature range, which can couple well with the VOC molecules generated during processing. The volatilized vapor can carry VOCs out of the exhaust port, achieving a deodorizing effect and reducing the emission of plastic products.

[0034] (5) When polypropylene modified by carboxylation and metal nanowires modified by amination are manufactured into masterbatch, the carboxyl and amino groups on the surface can undergo acylation reaction to generate acyl groups, which effectively improves the binding of metal nanowires in masterbatch and improves the gloss and durability of masterbatch material during use. Detailed Implementation

[0035] 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.

[0036] The present invention will be described in detail below with reference to specific embodiments.

[0037] The polypropylene used in the examples is B310F from SK Corporation of South Korea.

[0038] The pore-forming agents used in the examples were nitrogen and carbon dioxide from Air Liquefaction.

[0039] The silver nanowires, copper nanowires, and titanium dioxide nanowires used in the examples were purchased from Xianfeng Nanomaterials Technology Co., Ltd.

[0040] The solvents used in the examples, distilled water, ethanol, and isopropanol, were all purchased from Aladdin Chemical Reagents.

[0041] The surfactants sodium dodecyl sulfonate, alkylphenol polyoxyethylene ether OP-10, and polysorbate Tween 20 used in the examples were all purchased from Taobao.

[0042] In the examples, the matrix resins used as modified plastics are polypropylene (Sinopec's PPR-MT40-S) and high-density polyethylene (Jilin Petrochemical's JHC7260).

[0043] Example 1

[0044] Place 10 kg of polypropylene into a reactor and heat it to 180°C. Then inject 5 g of carbon dioxide into the reactor, seal and diffuse for 3-5 hours, then cool the reactor to 30°C and then depressurize it at a rate of 10 MPa / min to obtain a porous polymer carrier.

[0045] 0.5 kg of OP-10 was added to a mixture of 2.5 kg of water and 2 kg of ethanol and stirred until homogeneous. Then, 5 kg of copper nanowires with an aspect ratio of 12000 were added to the mixture and ultrasonically dispersed for 10 min to obtain a metal nanowire dispersion.

[0046] 10 kg of metal nanowire dispersion and 10 kg of porous polymer carrier were mixed and stirred for 30 min to prepare an adsorption-type gloss-enhancing masterbatch.

[0047] 0.1 kg of the above-mentioned adsorbent-type gloss-enhancing masterbatch was added to 10 kg of polypropylene and mixed evenly in a mixing machine. Then, high-gloss modified polypropylene was obtained by co-extrusion granulation. Its mechanical properties and gloss were tested, and the results are as follows:

[0048] Table 1. Material property test results of Example 1

[0049]

[0050] Example 2

[0051] Place 10 kg of polypropylene into a reactor and heat it to 170°C. Then inject 1 kg of carbon dioxide into the reactor, seal and diffuse for 3-5 hours, then cool the reactor to 30°C and then depressurize it at a rate of 10 MPa / min to obtain a porous polymer carrier.

[0052] 1 kg of polyvinylpyrrolidone was added to a mixture of 5 kg of water and 5 kg of isopropanol and stirred until homogeneous. Then, 5 kg of silver nanowires with an aspect ratio of 1000 were added to the mixture and ultrasonically dispersed for 10 min to obtain a metal nanowire dispersion.

[0053] 16 kg of metal nanowire dispersion and 10 kg of porous polymer carrier were mixed and stirred for 30 min to prepare an adsorption-type gloss-enhancing masterbatch.

[0054] 0.1 kg of the above-mentioned adsorbent-type gloss-enhancing masterbatch was added to 10 kg of high-density polyethylene and mixed evenly in a mixing machine. Then, the mixture was granulated by co-extrusion to obtain high-gloss modified polyethylene. Its mechanical properties and gloss were tested, and the results are as follows:

[0055] Table 2. Material property test results of Example 2

[0056]

[0057] Example 3

[0058] Place 10 kg of polystyrene into a reactor and heat it to 175°C. Then inject 0.5 kg of carbon dioxide into the reactor, seal and diffuse for 3-5 hours, then cool the reactor to 30°C and then depressurize it at a rate of 10 MPa / min to obtain a porous polymer carrier.

[0059] 0.5 kg of OP-10 was added to a mixture of 10 kg of water and 5 kg of isopropanol and stirred until homogeneous. Then, 5 kg of titanium dioxide nanowires with an aspect ratio of 23000 were added to the mixture and ultrasonically dispersed for 10 min to obtain a metal nanowire dispersion.

[0060] 20 kg of metal nanowire dispersion and 5 kg of porous polymer carrier were mixed and stirred for 30 min to prepare an adsorption-type gloss-enhancing masterbatch.

[0061] 0.1 kg of the above-mentioned adsorbent-type gloss-enhancing masterbatch was added to 10 kg of polypropylene and mixed evenly in a mixing machine. Then, high-gloss modified polypropylene was obtained by co-extrusion granulation. Its mechanical properties and gloss were tested, and the results are as follows:

[0062] Table 3. Material property test results of Example 3

[0063]

[0064] Example 4

[0065] Place 10 kg of EVA into a reactor and heat it to 140°C. Then inject 5 g of nitrogen into the reactor, seal and diffuse for 3-5 hours, cool the reactor to 30°C, and then depressurize at a rate of 10 MPa / min to obtain a porous polymer carrier.

[0066] 0.5 kg of Tween-20 was added to a mixture of 5 kg of water and 5 kg of isopropanol and stirred until homogeneous. Then, 8 kg of silver nanowires with an aspect ratio of 1000 were added to the mixture and ultrasonically dispersed for 10 min to obtain a metal nanowire dispersion.

[0067] An adsorption-type gloss-enhancing masterbatch was prepared by mixing 18 kg of metal nanowire dispersion and 2 kg of porous polymer carrier for 30 min.

[0068] 0.1 kg of the above-mentioned adsorbent-type gloss-enhancing masterbatch was added to 10 kg of high-density polyethylene and mixed evenly in a mixing machine. Then, the mixture was granulated by co-extrusion to obtain high-gloss modified polyethylene. Its mechanical properties and gloss were tested, and the results are as follows:

[0069] Table 4. Material property test results of Example 4

[0070]

[0071]

[0072] Example 5

[0073] The difference from Example 1 is that carboxylated polypropylene and amino-modified copper nanowires are used.

[0074] Preparation of carboxylated polypropylene: Polypropylene powder and nitric acid were weighed at a mass ratio of 1:2, and the mixture was stirred at 135℃ for 6 hours to obtain a mixed solution. After cooling, the mixture was washed with water and dried under vacuum to obtain carboxylated polypropylene.

[0075] Preparation of copper-ammoniated nanowires: Copper oxide nanoparticles were suspended in a 95% ethanol-water solution to achieve a copper oxide nanoparticle mass percentage of 2%. After sonication for 2 hours, the solution was heated to 70°C to obtain a mixture. 0.5 wt% ammonia was added to the mixture, followed by slow dropwise addition of 0.75 wt% tetraethyl orthosilicate. The reaction was carried out for 7 hours, followed by aging for 3 hours. The product was washed three times with water under an external magnetic field to obtain CuO / SiO2 nanoparticles. Chitosan was dissolved in a 2 wt% acetic acid solution to achieve a chitosan solution mass fraction of 4%. The obtained CuO / SiO2 nanoparticles were dispersed in the chitosan solution. After sonic degradation for 0.5 hours, sodium tripolyphosphate solution (0.05 M, pH 8.0) with a volume twice that of the chitosan solution was added, and the mixture was stirred for 13 hours. The product was separated under an external magnetic field and washed three times with water. After vacuum drying, copper-ammoniated nanowires were obtained.

[0076] 10 kg of carboxylated polypropylene is placed in a reactor and heated to 180 °C. Then, 5 g of carbon dioxide is injected into the reactor. After sealing and diffusion for 3-5 hours, the reactor is cooled to 30 °C and then depressurized at a rate of 10 MPa / min to obtain a porous polymer carrier.

[0077] 0.5 kg of OP-10 was added to a mixture of 2.5 kg of water and 2 kg of ethanol and stirred until homogeneous. Then, 5 kg of copper ammoniated nanowires with an aspect ratio of 12000 were added to the mixture and ultrasonically dispersed for 10 min to obtain a metal nanowire dispersion.

[0078] 10 kg of metal nanowire dispersion and 10 kg of porous polymer carrier were mixed and stirred for 30 min to prepare an adsorption-type gloss-enhancing masterbatch.

[0079] Add 0.1 kg of the above-mentioned adsorption-type gloss-enhancing masterbatch to 10 kg of polypropylene, mix evenly in a mixing machine, and then granulate by blending extrusion to obtain high-gloss modified polypropylene.

[0080] Example 6

[0081] The difference from Example 1 is that carboxylated polypropylene and amino-modified copper nanowires are used.

[0082] Preparation of carboxylated polypropylene: Polypropylene powder and nitric acid were weighed at a mass ratio of 1:3, and stirred at 130℃ for 5 hours to obtain a mixed solution. After cooling, the solution was washed with water and dried under vacuum to obtain carboxylated polypropylene.

[0083] Preparation of copper-ammoniated nanowires: Copper oxide nanoparticles were suspended in a 95% ethanol-water solution to achieve a copper oxide nanoparticle mass percentage of 3%. After sonication for 1.5 h, the solution was heated to 75 °C to obtain a mixture. 0.5 wt% ammonia was added to the mixture, followed by slow dropwise addition of 0.75 wt% tetraethyl orthosilicate. The reaction was carried out for 6 h, followed by aging for 2 h. The product was washed three times with water under an external magnetic field to obtain CuO / SiO2 nanoparticles. Chitosan was dissolved in a 2 wt% acetic acid solution to achieve a chitosan solution mass fraction of 4%. The obtained CuO / SiO2 nanoparticles were dispersed in the chitosan solution. After acoustic degradation for 0.4 h, sodium tripolyphosphate solution (0.05 M, pH 8.0) with a volume twice that of the chitosan solution was added, and the mixture was stirred for 12 h. The product was separated under an external magnetic field and washed three times with water. After vacuum drying, copper-ammoniated nanowires were obtained.

[0084] 10 kg of carboxylated polypropylene is placed in a reactor and heated to 180 °C. Then, 5 g of carbon dioxide is injected into the reactor. After sealing and diffusion for 3-5 hours, the reactor is cooled to 30 °C and then depressurized at a rate of 10 MPa / min to obtain a porous polymer carrier.

[0085] 0.5 kg of OP-10 was added to a mixture of 2.5 kg of water and 2 kg of ethanol and stirred until homogeneous. Then, 5 kg of copper ammoniated nanowires with an aspect ratio of 12000 were added to the mixture and ultrasonically dispersed for 10 min to obtain a metal nanowire dispersion.

[0086] 10 kg of metal nanowire dispersion and 10 kg of porous polymer carrier were mixed and stirred for 30 min to prepare an adsorption-type gloss-enhancing masterbatch.

[0087] Add 0.1 kg of the above-mentioned adsorption-type gloss-enhancing masterbatch to 10 kg of polypropylene, mix evenly in a mixing machine, and then granulate by blending extrusion to obtain high-gloss modified polypropylene.

[0088] Comparative Example 1

[0089] Copper nanowires and surfactants in different proportions were added to polypropylene and mixed and dispersed in a mixer for 30 minutes. The mixture was then fed into a twin-screw extruder for melt blending, extrusion, and granulation. The twin-screw spindle speed was adjusted according to the melt viscosity, and the processing temperature was set as follows:

[0090] Table 5 Processing Temperature Settings

[0091] Temperature zone 1 2 3 4 5 6 7 8 Temperature / °C 140 180 200 230 230 230 220 200

[0092] Table 6 Production status of blend systems with different proportions

[0093] formula Polypropylene / Kg Copper nanowires / Kg OP-10 / kg Production status 1 9 10 1 The viscosity is too high, and the screw cannot extrude the product. 2 9.7 3 0.3 High viscosity, low screw extrusion efficiency 3 8.35 1.5 0.15 It can be extruded normally.

[0094] The above experiments show that an excessively high effective content of metallic luster agent renders the polypropylene unprocessable. Therefore, a luster masterbatch with an effective content of 15% was used to modify the polypropylene. Two dosages were selected for modification, and their effects on the polypropylene properties were investigated. The performance comparison with the examples is as follows:

[0095] Table 7 Comparison of the effects of two dosages on polypropylene properties

[0096]

[0097] Analysis of Comparative Example 1: The comparative examples above show that preparing high-concentration gloss masterbatches using the traditional blending extrusion granulation method is not feasible. Furthermore, under the same dosage, the gloss performance of modified polypropylene prepared using traditional granulation and adsorbent-type gloss-enhancing masterbatches is significantly lower than that of polypropylene modified using adsorbent-type gloss-enhancing masterbatches. This is mainly because the effective gloss agent content in traditionally granulated gloss masterbatches is low. To increase the effective gloss agent content in the blend system, the amount of masterbatch needs to be increased. While increasing the amount of granulated gloss masterbatch improves the gloss of the modified polypropylene, it is still inferior to the modification effect using adsorbent-type gloss-enhancing masterbatch. This is primarily because masterbatches prepared using traditional granulation methods suffer from performance loss during primary thermal processing and uneven dispersion during secondary thermal processing.

[0098] Comparative Example 2

[0099] The difference from Example 5 is that only carboxylated polypropylene was used, and aminated copper nanowires were not used;

[0100] Preparation of carboxylated polypropylene: Polypropylene powder and nitric acid were weighed at a mass ratio of 1:2, and the mixture was stirred at 135℃ for 6 hours to obtain a mixed solution. After cooling, the mixture was washed with water and dried under vacuum to obtain carboxylated polypropylene.

[0101] 10 kg of carboxylated polypropylene is placed in a reactor and heated to 180 °C. Then, 5 g of carbon dioxide is injected into the reactor. After sealing and diffusion for 3-5 hours, the reactor is cooled to 30 °C and then depressurized at a rate of 10 MPa / min to obtain a porous polymer carrier.

[0102] 0.5 kg of OP-10 was added to a mixture of 2.5 kg of water and 2 kg of ethanol and stirred until homogeneous. Then, 5 kg of copper nanowires with an aspect ratio of 12000 were added to the mixture and ultrasonically dispersed for 10 min to obtain a metal nanowire dispersion.

[0103] 10 kg of metal nanowire dispersion and 10 kg of porous polymer carrier were mixed and stirred for 30 min to prepare an adsorption-type gloss-enhancing masterbatch.

[0104] 0.1 kg of the above-mentioned adsorption-type gloss-enhancing masterbatch was added to 10 kg of polypropylene and mixed evenly in a mixing machine. Then, high-gloss modified polypropylene was obtained by co-extrusion granulation, and its mechanical properties and gloss were tested.

[0105] Durability test

[0106] Test method: The materials obtained in Examples 1, 5, 6, and Comparative Example 2 were sequentially suspended in ethanol-water and stirred at 200 rpm for 0.5 hours. After the reaction was completed, the mixture was filtered out. This process was repeated 10 times, and then the materials were characterized. The results are as follows:

[0107] Table 8 Characterization Tests of Materials

[0108] Testing items unit Example 1 Example 5 Example 6 Comparative Example 2 Masterbatch addition amount ％ 1 1 1 1 Effective content of gloss agent ％ 0.5 0.5 0.5 0.5 Tensile strength MPa 30.1 33 34 32 Impact strength <![CDATA[KJ / m 2 ]]> 3.75 4.13 4.09 4.05 Bending strength MPa 33.6 35.9 36.2 35.8 Surface gloss ％ 88.6 97.1 96.5 90.2

[0109] As shown in Table 8, the surface carboxyl and amination treatments effectively improved the loading strength of metal nanowires in the masterbatch, thus enhancing the durability of the obtained material and maintaining good luster during cyclic testing.

[0110] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No markings in the claims should be construed as limiting the scope of the claims.

Claims

1. A method for preparing an adsorption-type gloss-enhancing masterbatch, characterized in that, The process includes the following steps: 10 kg of polypropylene is placed in a reactor and heated to 170°C. Then, 1 kg of carbon dioxide is injected into the reactor, and after sealing and diffusion for 3-5 hours, the reactor is cooled to 30°C. Then, the pressure is released at a rate of 10 MPa / min to obtain a porous polymer carrier. 1 kg of polyvinylpyrrolidone is added to a mixture of 5 kg of water and 5 kg of isopropanol and stirred until homogeneous. Then, 5 kg of silver nanowires with an aspect ratio of 1000 are added to the mixture and ultrasonically dispersed for 10 min to obtain a metal nanowire dispersion. 16 kg of the metal nanowire dispersion and 10 kg of the porous polymer carrier are mixed and stirred for 30 min to prepare an adsorption-enhanced gloss masterbatch. 0.1 kg of the above adsorption-enhanced gloss masterbatch is added to 10 kg of high-density polyethylene and mixed evenly in a mixing machine. Then, the mixture is granulated by co-extrusion to obtain an adsorption-enhanced gloss masterbatch.

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