A polystyrene composition, its preparation and use

Abstract

The application relates to the technical field of modified plastics, and particularly discloses a polystyrene composition, a preparation method and application thereof. The polystyrene composition comprises the following components in parts by weight: polystyrene 60-80 parts, a toughening agent 10-25 parts, a self-cleaning agent 2-30 parts, a hydrophobic agent 0.1-0.5 parts, a hydrophobic synergist 2-10 parts and a lubricant 0.1-1 part; the self-cleaning agent is polyethylene; and the hydrophobic synergist is a two-dimensional sheet-shaped inorganic material. The four, namely the self-cleaning agent, the hydrophobic agent with the function of reducing the surface energy of the material, the hydrophobic synergist and the lubricant, are mutually synergistic, so that the contact angle of the polystyrene composition is increased, the polystyrene composition has excellent self-cleaning performance and hydrophobic performance, and oil stains are difficult to remain on the surface. In actual application, the polystyrene composition has good waterproof and dirt-proof performance, and can maintain a good appearance for a long time in use.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of modified plastics, in particular to a polystyrene composition and a preparation method and application thereof. BACKGROUND

[0002] Polystyrene is the third largest general-purpose plastic, with the English name of polystyrene and the abbreviation of PS. Polystyrene has good transparency, good formability, good rigidity, easy dyeing, low moisture absorption and low price, and has been widely used in packaging, electronics, construction, automobile household appliances, instruments, daily necessities and toys industries.

[0003] However, polystyrene is brittle and has low impact strength, so increasing its toughness has always been an important research of PS modification. In addition, with the acceleration of modern life pace and the increase of consumer demand, people also have corresponding demand for the stain resistance of materials. For example, automobile parts, the outer decoration is easy to be contaminated by dirt and rain; the inner decoration is easy to be contaminated by sweat, food oil stains, cosmetics, etc.; residual oil stains can corrode the surface of the parts, damage the surface of the plastic parts, and even destroy them; in addition, for example, toilet and bathroom products, especially the seat parts, require the material to have self-cleaning and high gloss performance. Therefore, the self-cleaning property of the material is also an important performance to be considered.

[0004] Currently, there are reports on self-cleaning polypropylene materials, but the overall mechanical properties such as rigidity and toughness of the self-cleaning polypropylene materials are low, and the size stability of the self-cleaning polypropylene materials is poor. Therefore, it is necessary to develop a self-cleaning polystyrene composition. SUMMARY

[0005] The present application aims to overcome the shortcomings of the prior art and provide a polystyrene composition and a preparation method and application thereof. The self-cleaning agent, hydrophobic agent, hydrophobic synergist and lubricant are added to the polystyrene composition, which synergize with each other to improve the self-cleaning performance and impact toughness of the polystyrene composition.

[0006] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0007] The first object of the present application provides a polystyrene composition, which comprises the following components in parts by weight:

[0008] Polystyrene 60-80 parts, toughening agent 10-25 parts, self-cleaning agent 2-30 parts, hydrophobic agent 0.1-0.5 parts, hydrophobic synergist 2-10 parts and lubricant 0.1-1 part;

[0009] The self-cleaning agent is polyethylene; the hydrophobic synergist is a two-dimensional sheet-like inorganic material.

[0010] The self-cleaning agent, the hydrophobic agent, the hydrophobic synergist and the lubricant are used in the present application to increase the contact angle of the polystyrene composition, and the lubricant helps the self-cleaning agent and the hydrophobic agent to be precipitated on the surface of the polystyrene composition together with the lubricant, so that the polystyrene composition has good water and dirt proofing performance, and the oil stain is difficult to remain on the surface, and the polystyrene composition has good water and dirt proofing performance and good appearance in practical application.

[0011] Meanwhile, the toughening agent and the self-cleaning agent are compounded to improve the impact toughness of the polystyrene composition, so that the polystyrene composition has good self-cleaning performance and mechanical properties.

[0012] As a preferred embodiment of the polystyrene composition of the present application,

[0013] The polystyrene has a melt index of 3-15 g / min under the condition of a test temperature of 200℃ and a load of 5 kg.

[0014] As a preferred embodiment of the polystyrene composition of the present application, the self-cleaning agent is 10-25 parts, the hydrophobic agent is 0.2-0.4 parts, the hydrophobic synergist is 3-8 parts, and the lubricant is 0.2-0.8 parts.

[0015] When the components of the polystyrene composition are selected in the above weight ranges, the contact angle of the composition can be better increased, and the self-cleaning performance of the polystyrene composition is further improved.

[0016] As a preferred embodiment of the polystyrene composition of the present application, the density of the polyethylene is 0.922 g / cm 3 -0.957 g / cm 3 , preferably, the density of the polyethylene is 0.945 g / cm 3 -0.955 g / cm 3 .

[0017] As a preferred embodiment of the polystyrene composition of the present application, the polyethylene has a melt index of 0.4-7.6 g / 10 min under the test conditions of test standard ISO 1133-2011, a test temperature of 190°C, and a load of 2.16 kg; preferably, the melt index is 0.8-3 g / 10 min.

[0018] When the self-cleaning agent is polyethylene having the density and melt index in the above range, the flowability of the polyethylene is higher than that of the polystyrene, and there is a certain incompatibility between the two phases, which can be precipitated to the surface of the polystyrene during the processing injection molding to form a protruding structure. The addition of the self-cleaning agent can reduce the contact area between water and the polystyrene composition on the one hand, and can reduce the charge effect between water and the polystyrene composition on the other hand, thereby achieving good self-cleaning effect.

[0019] When water contacts the polystyrene composition, the protruding structure formed on the surface can lift up the water, and the water droplets will not infiltrate into the middle of the protrusion, and the middle will be filled with air, so that the contact area between water and the polystyrene composition will be greatly reduced, and the charge attraction effect will be reduced. At the same time, the distance between water and the polystyrene composition is also widened (by the distance of the protrusion). Water is a polar molecule, and the self-cleaning agent is a non-polar crystalline substance.

[0020] When the polyethylene has the above density, there is a difference in flowability and compatibility between the polyethylene and the polystyrene, and the self-cleaning agent can be precipitated to the surface of the material. Therefore, when the polyethylene has the above density, on the one hand, the contact area between water and the polystyrene composition can be better reduced, and on the other hand, the self-cleaning agent is a non-polar substance, which can reduce the charge effect between water and the polystyrene composition, and can better improve the self-cleaning performance of the polystyrene composition.

[0021] As a preferred embodiment of the polystyrene composition of the present application, the hydrophobic agent is a fluorocarbon surfactant, and the fluorocarbon surfactant includes at least one of anionic fluorocarbon surfactant, cationic fluorocarbon surfactant, non-ionic fluorocarbon surfactant, amphoteric fluorocarbon surfactant, silicon-containing fluorocarbon surfactant, hybrid surfactant, long-chain surfactant, and hydrophilic group-free fluorocarbon surfactant.

[0022] In the present application, the hydrophobic agent is selected to be a fluorocarbon surfactant, which has extremely low surface energy and water repellency. The addition of the fluorocarbon surfactant to the polystyrene composition forms a thin film on the outer surface of the polystyrene composition, and the long side chain containing fluorine can stretch and orient at the interface, so that the performance of the polystyrene composition remains stable; at the same time, the surface energy of the polystyrene composition is significantly reduced, and the hydrophobic performance is exhibited. When other low surface energy substances such as polypropylene substances are added, they are incompatible with the polystyrene system, and the product produces delamination.

[0023] As a preferred embodiment of the polystyrene composition of the present application, the inorganic material comprises talc or mica.

[0024] The purpose of adding the hydrophobic synergist is to modify the polystyrene composition. When the hydrophobic synergist is a two-dimensional sheet-like inorganic material, the two-dimensional sheet-like inorganic material has a large void ratio. When water droplets contact the surface of the polystyrene composition in a high-temperature and high-humidity environment, the air existing in the void structure is easy to form an air cushion, which is beneficial to reduce the interfacial interaction, thereby reducing the rolling angle of the surface of the polystyrene composition.

[0025] As a preferred embodiment of the polystyrene composition of the present application, the lubricant is one or more of paraffin, stearic acid, butyl stearate, oleamide or ethylene bis-stearamide. Preferably, the lubricant is ethylene bis-stearamide.

[0026] The addition of the lubricant in the polystyrene composition of the present application can cause the lubricant to precipitate to the surface of the polystyrene composition, further blocking moisture and reducing the pollution of the external environment to the polystyrene composition.

[0027] As a preferred embodiment of the polystyrene composition of the present application, the polystyrene is high-impact polystyrene HIPS and / or GPPS plastic.

[0028] As a preferred embodiment of the polystyrene composition of the present application, the toughening agent is a styrene-butadiene-styrene block copolymer, and the content of butadiene in the styrene-butadiene-styrene block copolymer is 50%-80%, preferably 70%.

[0029] The second object of the present application provides a preparation method of the above-mentioned polystyrene composition, comprising the following steps:

[0030] 1) The above components are weighed according to the weight parts;

[0031] 2) The polystyrene, the toughening agent, the self-cleaning agent, the hydrophobic agent, the hydrophobic synergist and the lubricant are blended and fed into the main feeding port of the twin-screw extruder, and then extruded and granulated to obtain the polystyrene composition.

[0032] The third object of the present application provides the application of the above-mentioned polystyrene composition in household appliances, OA equipment, audio-visual equipment and electric vehicle products.

[0033] Compared with the prior art, the present application has the following beneficial effects:

[0034] The present application provides a polystyrene composition and a preparation method and application thereof. The polystyrene composition is added with a self-cleaning agent. On the one hand, the self-cleaning agent can better reduce the contact surface of water and the polystyrene composition. On the other hand, the self-cleaning agent is a non-polar substance, which can reduce the charge effect of water and the polystyrene composition, and can better improve the self-cleaning performance of the polystyrene composition. The present application utilizes the mutual cooperation of the self-cleaning agent, the hydrophobic agent with the function of reducing the surface energy of the material, the hydrophobic synergist and the lubricant, so that the contact angle of the polystyrene composition is increased, thereby making the polystyrene composition have excellent self-cleaning performance and hydrophobic performance, and making it difficult for oil stains to remain on the surface. In actual application, the polystyrene composition has good waterproof and dirt-proof performance, and can maintain good appearance for a long time in use. DETAILED DESCRIPTION

[0035] For the purpose, technical solution and advantages of the present application, the present application will be further described below in combination with specific examples.

[0036] In the following examples and comparative examples, the experimental methods used are conventional methods unless otherwise specified, and the materials, reagents, etc. used are commercially available unless otherwise specified.

[0037] The raw material sources of the following examples and comparative examples are as follows:

[0038] Polystyrene: GPPS plastic, model GPPS 123P, melt index under the condition of a test temperature of 200℃ and a load of 5kg is 7g / min, and the manufacturer is Shanghai Sike;

[0039] Toughening agent: styrene-butadiene-styrene block copolymer, the content of butadiene in the styrene-butadiene-styrene block copolymer is 70%, model SBS 792E, and the manufacturer is Balin Petrochemical;

[0040] Self-cleaning agent 1: polyethylene, model Aceso PEM 2408, density 0.922g / cm 3 , melt index under the condition of a temperature of 190℃ and a load of 2.16kg is 0.4g / 10min, the test standard is ISO1133-2011, and the manufacturer is TotalEnergies company;

[0041] Self-cleaning agent 2: polyethylene, model TR-144, density 0.945g / cm 3 , melt index under the condition of a temperature of 190℃ and a load of 2.16kg is 0.8g / 10min, the test standard is ISO1133-2011, and the manufacturer is Maoming Petrochemical;

[0042] Self-cleaning agent 3: polyethylene, model ACCUCOMP HD0202L, density 0.955 g / cm 3 Melt index 3 g / 10 min at 190℃, load 2.16 kg, test standard ISO1133-2011, manufacturer LyondellBasell Industries Company;

[0043] Self-cleaning agent 4: polyethylene, model HDPE FHC7260, density 0.957 g / cm 3 Melt index 7.6 g / 10 min at 190℃, load 2.16 kg, test standard ISO1133-2011, manufacturer Fushun Petrochemical;

[0044] Self-cleaning agent 5: polyethylene, model HDPE 5000S, density 0.950 g / cm 3 Melt index 1.1 g / 10 min at 190℃, load 2.16 kg, test standard ISO1133-2011, manufacturer Daqing Petrochemical;

[0045] Self-cleaning agent 6: polyethylene, model LDPE 1c7a, density 0.918 g / cm 3 Melt index 9.5 g / 10 min at 190℃, load 2.16 kg, test standard ISO1133-2011, manufacturer France Total;

[0046] Self-cleaning agent 7: polyethylene, model HDPE 2911, density 0.960 g / cm 3 Melt index 20 g / 10 min at 190℃, load 2.16 kg, test standard ISO1133-2011, manufacturer Fushun Petrochemical;

[0047] Hydrophobic agent: non-ionic fluorocarbon surfactant, Capstone FS-3100 of Ganzhou Kermel Chemical Co., Ltd., manufacturer is the United States Kermel;

[0048] Hydrophobic synergist: talc TYT-777A, manufacturer is Haicheng Tianyuan Chemical Industry Co., Ltd.;

[0049] Lubricant: ethylene bis-stearamide, purchased from Dongguan Nuojia Plastic Co., Ltd.

[0050] Examples 1-11 and Comparative Examples 1-6

[0051] Examples 1-11 and Comparative Examples 1-6 provide a polystyrene composition, the tumor fraction of the formula is shown in Table 1, and the preparation method is as follows:

[0052] 1) Add polystyrene, toughening agent, self-cleaning agent, hydrophobic agent, hydrophobic synergist and lubricant to the premixer according to the weight parts and mix for 6-8 minutes to obtain the mixture;

[0053] 2) The mixture is fed into the twin-screw extruder through the main feed port. The length-to-diameter ratio of the twin-screw extruder is 35:1. After mixing, melting, and homogenization, the mixture is extruded and granulated. The temperature settings of the twin-screw extruder are as follows: Zone 1 temperature is 80-100℃, Zones 2 to 4 temperature is 150-170℃, Zones 5 to 8 temperature is 170-190℃, Zone 9 temperature is 190-200℃, and the main engine speed is 500-700 rpm to obtain the polystyrene composition.

[0054]

[0055]

[0056] The polystyrene compositions prepared in Examples 1-11 and Comparative Examples 1-6 were subjected to performance tests, and the test methods for each performance are as follows:

[0057] 1) Notched impact strength of cantilever beam (KJ / m) 2 Tested according to ISO 180-2019;

[0058] 2) Contact angle (°): Tested according to GB / T30693-2014.

[0059] The test results are shown in Table 2.

[0060] Table 2

[0061]

[0062]

[0063] in conclusion:

[0064] As shown in Table 2, the polystyrene composition of the present invention has a contact angle of 103-115° and a notched cantilever beam impact strength of 8.5-28.3 KJ / m. 2 More preferably, the contact angle of the polystyrene composition can reach 110-115°, and the notched impact strength of the cantilever beam can reach 22.3-28.3 KJ / m. 2 .

[0065] Examples 5-9 used polyethylene with different densities and melt flow rates. The polystyrene composition prepared in Example 5 showed better mechanical and hydrophobic properties than the polystyrene compositions of Examples 7-9. The polystyrene compositions prepared in Examples 7-8 showed better performance than those prepared in Examples 6 and 9. The polystyrene compositions of Examples 5-9 had better impact properties than those of Examples 10-11, and the contact angle of the polystyrene compositions of Examples 5-9 was larger than that of Examples 10-11.

[0066] Comparative Example 1, which lacks a self-cleaning agent, and Comparative Example 2, which lacks a toughening agent, both showed significantly reduced impact performance. This indicates that the combination of toughening agent and self-cleaning agent helps improve the toughness of the material. Furthermore, Comparative Example 1 exhibits a small contact angle and poor hydrophobicity; while Comparative Example 2, although showing acceptable hydrophobicity, suffers from very poor impact resistance.

[0067] Comparative Examples 3-5 show that removing hydrophobic agents, fillers, or lubricants from the formulation significantly reduces the contact angle of the composition, resulting in poorer hydrophobic properties.

[0068] In Comparative Example 6, the significant increase in polyethylene led to a decrease in the compatibility of polystyrene / polyethylene, and a significant reduction in both mechanical and hydrophobic properties.

[0069] Adding a self-cleaning agent to a polystyrene composition results in a higher fluidity compared to polystyrene, and the two phases exhibit some incompatibility. This can lead to the agent precipitating onto the surface of the polystyrene composition during injection molding, forming raised structures. Therefore, this invention utilizes the synergistic effect of a self-cleaning agent, a hydrophobic agent that reduces the surface energy of the material, a hydrophobic synergist, and a lubricant to increase the contact angle of the polystyrene composition. This results in excellent self-cleaning and hydrophobic properties, making it difficult for oil stains to remain on the surface. In practical applications, this manifests as good water and dirt resistance in the polystyrene composition, maintaining a good appearance over a long period of use.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A polystyrene composition, characterized in that, The components include the following parts by weight: 60-80 parts polystyrene, 10-25 parts toughening agent, 2-30 parts self-cleaning agent, 0.1-0.5 parts hydrophobic agent, 2-10 parts hydrophobic synergist, and 0.1-1 parts lubricant; The polystyrene is high-impact polystyrene HIPS and / or GPPS plastic; The self-cleaning agent is polyethylene, and the density of the polyethylene is 0.945 g / cm³. 3 ~0.955g / cm 3 The hydrophobic agent is a fluorocarbon surfactant; the hydrophobic synergist is a two-dimensional layered inorganic material.

2. The polystyrene composition according to claim 1, characterized in that, The composition includes 10-25 parts self-cleaning agent, 0.2-0.4 parts hydrophobic agent, 3-8 parts hydrophobic synergist, and 0.2-0.8 parts lubricant.

3. The polystyrene composition according to claim 1, characterized in that, The polyethylene was tested according to ISO 1133-2011, with a melt index of 0.4 to 7.6 g / 10 min under the conditions of 190℃ and 2.16 kg load.

4. The polystyrene composition according to claim 3, characterized in that, The melt flow index of the polyethylene tested at a temperature of 190℃ and a load of 2.16kg was 0.8–3 g / 10min.

5. The polystyrene composition according to claim 1, characterized in that, The fluorocarbon surfactants include at least one of the following: anionic fluorocarbon surfactants, cationic fluorocarbon surfactants, nonionic fluorocarbon surfactants, amphoteric fluorocarbon surfactants, silicone-containing fluorocarbon surfactants, hybrid surfactants, long-chain surfactants, and hydrophilic-free fluorocarbon surfactants.

6. The polystyrene composition according to claim 1, characterized in that, The inorganic material includes talc or mica.

7. The polystyrene composition according to claim 1, characterized in that, The lubricant is one or more of paraffin wax, stearic acid, butyl stearate, oleamide, or ethylene bis-stearamide.

8. A method for preparing a polystyrene composition according to any one of claims 1 to 7, characterized in that, Includes the following steps: 1) Weigh the above components according to their weight parts; 2) Polystyrene, toughening agent, self-cleaning agent, hydrophobic agent, hydrophobic synergist and lubricant are mixed and fed into the main feed port of a twin-screw extruder, extruded and granulated to obtain a polystyrene composition.

9. The use of the polystyrene composition according to any one of claims 1 to 7 in home appliances, OA equipment, audio-visual equipment, and electric vehicle products.

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