Modified pearlescent color oil, resin alloy material, preparation method and application thereof

Abstract

The application discloses a modified pearl color oil, a resin alloy material and a preparation method and application thereof. The modified pearl color oil comprises the following raw material components in percentage by weight: inorganic mineral white oil: 40-60 wt%; styrene: 10-30 wt%; pearl powder: 10-30 wt%; and silane coupling agent: 0.5-5 wt%. The modified pearl color oil is combined with a resin containing styrene monomers, so that the compatibility and flowability of the pearl powder and the resin can be obviously improved, and the impact resistance and appearance brightness of the resin alloy material obtained after the combination are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of resin material preparation technology, and in particular to a modified pearlescent color oil, a resin alloy material, its preparation method, and its application. Background Technology

[0002] Polystyrene resin is one of the five major general-purpose engineering plastics. Due to its high strength, low specific gravity, ease of processing and molding, and advantages such as transparency, low cost, rigidity, insulation, and good printability, it is widely used in the fields of household appliance casings and electronic appliances. With the development of the social economy and the continuous improvement of people's living standards, the requirements for the diversification of the appearance of electronic and household appliances are getting higher and higher. Not only is it required to have ultra-high gloss to give the surface of the product a bright and shiny metallic visual effect, but also to have high strength of the material to make the product resistant to drops during use.

[0003] During the polymerization and blending processes of existing PS resin and alloy resin materials, the shear force of the screw in the equipment is insufficient to achieve the required level of material damage. Furthermore, injection-molded parts made from this material require painting and dyeing processes to achieve a metallic visual effect, which reduces production efficiency, increases costs, and causes significant environmental pollution from these processes, thus limiting the application of this material in various fields.

[0004] Chinese patent CN201510205663.1 discloses a paint-free, weather-resistant, metallic ASA composite material and its preparation method, wherein the components are as follows: 98.0-99.5 wt% ASA resin, 0.2-1 wt% coated aluminum powder, 0.1-0.5 wt% silane coupling agent, and 0.2-0.5 wt% additives. The preparation method of the ASA composite material includes the following steps: (1) weighing each component according to the weight ratio of the formula; (2) mixing the coated aluminum powder, silane coupling agent, and additives evenly; (3) adding the ASA resin into the twin-screw extruder through the main feed port, and simultaneously adding the mixture obtained in step (1) through side feeding, followed by melt extrusion, cooling, drying, and pelletizing to obtain the product. The technology disclosed in the above patent achieves a metallic surface decoration effect by adding metal powder to the matrix resin. However, the following shortcomings still exist, affecting its use in various fields: 1. The resin used has low impact resistance and is prone to cracking; 2. The pearlescent powder resin has poor compatibility and is prone to producing metal flow marks. Summary of the Invention

[0005] In view of this, the main objective of the present invention is to provide a modified pearlescent color oil, a resin alloy material, a preparation method and application thereof. The modified pearlescent color oil and the resin containing styrene monomer can significantly improve the compatibility and flowability of pearlescent powder and resin, and at the same time greatly improve the impact resistance and gloss of the resin alloy material obtained after bonding.

[0006] To achieve the above-mentioned objective, the first aspect of this invention provides a modified pearlescent oil, comprising the following raw material components in weight percentage: inorganic mineral white oil: 40-60 wt%; styrene: 10-30 wt%; pearlescent powder: 10-30 wt%; silane coupling agent: 0.5-5 wt%.

[0007] Furthermore, the modified pearlescent oil mentioned above comprises the following raw material components in weight percentage: inorganic mineral white oil: 40-50 wt%; styrene: 20-30 wt%; pearlescent powder: 20-30 wt%; silane coupling agent: 0.5-2 wt%.

[0008] Furthermore, the inorganic mineral white oil is selected from commercially available No. 7 white oil, No. 9 white oil, and No. 10 white oil, with No. 10 white oil being preferred.

[0009] Further, the pearlescent powder comprises one or more of the following: mica-coated pearlescent powder, bismuth oxychloride crystalline pearlescent powder, silica-coated pearlescent powder, aluminum silicate-coated pearlescent powder, aluminum borate-coated pearlescent powder, and bismuth oxide-coated pearlescent powder; preferably, the surface of the pearlescent powder is at least coated with a layer of metal oxide, wherein the metal oxide is one or more of aluminum oxide, tin dioxide, titanium dioxide, iron oxide, antimony oxide, or zinc oxide; the particle size of the pearlescent powder is 5-500 μm, preferably 5-200 μm.

[0010] Furthermore, the silane coupling agent is an alkyl silane, selected from one or more of hexadecyltrimethoxysilane, n-decyltrimethoxysilane, and dodecyltrimethoxysilane, preferably hexadecyltrimethoxysilane.

[0011] A second aspect of the present invention provides a method for preparing modified pearlescent pigment oil, comprising the following steps:

[0012] 1) First, mix the inorganic mineral white oil and pearlescent powder evenly, then add styrene and mix to obtain a mixture;

[0013] 2) Heat the mixture to 50-200°C, then add a silane coupling agent to react and obtain modified pearlescent oil.

[0014] A third aspect of the present invention provides the application of the above-mentioned modified pearlescent oil, wherein the modified pearlescent oil, a resin containing styrene monomer, and optionally an additive are mixed to obtain a resin alloy material; wherein the resin containing styrene monomer is selected from one or more of PS resin, SAN resin, ABS resin, MS resin, and MBS resin.

[0015] A fourth aspect of the present invention provides a resin alloy material comprising the following raw material components by weight percentage:

[0016] PS resin: 30-70 wt%; SAN resin: 10-60 wt%; modified pearlescent oil: 0.5-10 wt%; additives: 2-20 wt%.

[0017] Furthermore, the PS / SAN resin alloy material comprises the following raw material components in weight percentage:

[0018] PS resin: 50-70 wt%; SAN resin: 20-30 wt%; modified pearlescent oil: 0.5-10 wt%; additives: 2-20 wt%.

[0019] Further, the additives include: lubricant: 0.5-5 wt%; antioxidant: 0.5-5 wt%; toughening compatibilizer: 0.5-5 wt%; ultraviolet absorber: 0.5-5 wt%.

[0020] Furthermore, the PS resin is selected from commercially available HIPS H888G, H666G, and PH8520, with HIPS H888G being preferred.

[0021] Furthermore, the SAN resin is selected from commercially available SANs, such as H80F, PN-107, PN106, with H80F being preferred.

[0022] Furthermore, the lubricant is selected from amides, stearic acids, and silicones, with stearic acid EBS being preferred.

[0023] Furthermore, the antioxidant is selected from one or a combination of two hindered phenolic antioxidants or phosphite antioxidants and their copolymers, preferably 1010 or 1076.

[0024] Furthermore, the toughening compatibilizer is selected from maleic anhydride-grafted PS-g-MAH, maleic anhydride-grafted POE, and maleic anhydride-grafted ABS, with maleic anhydride-grafted PS-g-MAH being preferred, and the grafting rate is preferably 0.6-1%.

[0025] Furthermore, the ultraviolet absorber is selected from salicylates, benzophenone, or benzotriazole, preferably benzophenone UV944.

[0026] The fifth aspect of this invention provides a method for preparing the above-mentioned resin alloy material, comprising the following steps:

[0027] (1) PS resin, SAN resin and additives are mixed to obtain a premix;

[0028] (2) Add the premixed material and modified pearlescent oil to a twin-screw extruder, melt and granulate it through the twin-screw extruder, and cool it to obtain a high-gloss, paint-free PS / SAN alloy material.

[0029] Furthermore, the extrusion temperature of the twin-screw extruder is 100–260°C, preferably 200–220°C.

[0030] Further, in step (2), the premix and the modified pearlescent oil are added to the twin-screw extruder from different feed ports; preferably, the premix enters from the main feed port of the twin-screw extruder, and the modified pearlescent oil enters from the side feed port of the twin-screw extruder.

[0031] The sixth aspect of the present invention also provides the application of the above-mentioned resin alloy material for injection molding of household appliances, 3C electronic products or toy products.

[0032] Compared with the prior art, the present invention has the following advantages:

[0033] This invention uses white oil as a base material. First, the white oil and pearlescent powder are thoroughly mixed and impregnated, then styrene is added and mixed again to obtain a mixture. The mixture is then reacted with a silane coupling agent under ultrasonic conditions to obtain a modified pearlescent color oil. The white oil impregnates the pearlescent powder, improving its dispersion and lubrication. The styrene introduces benzene ring segments into the pearlescent powder, enhancing its compatibility with the resin (the resin itself contains benzene ring segments). The addition of the silane coupling agent improves the affinity between the resin and pearlescent powder interface, reducing flow marks caused by the melting of the pearlescent powder and resin. Therefore, when this modified pearlescent color oil is combined with a styrene-containing resin, it significantly improves the compatibility and flowability of the pearlescent powder and resin, while greatly enhancing the impact resistance and gloss of the resulting material. Furthermore, in the preparation of resin alloy materials, adding the premix containing resin and modified pearlescent oil to the twin-screw extruder through different feed ports can reduce the damage of the pearlescent powder to the screw shear, thereby significantly improving the pearlescent flow marks and weld marks in the material molding process. The resulting paint-free resin alloy material has a distinct metallic texture, high gloss, high impact resistance, and low cost, thus expanding the application field of this material.

[0034] Other features and advantages of the present invention will be described in detail through the following specific embodiments. Detailed Implementation

[0035] The following provides a detailed description of specific embodiments of the present invention. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of the invention.

[0036] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0037] Unless otherwise specified, all raw materials involved in this invention are available from commercially available sources.

[0038] The tensile strength and impact strength mentioned below were measured according to ISO 527 and ISO 178 standards, respectively.

[0039] The first aspect of this invention provides a modified pearlescent oil, comprising the following raw material components by weight percentage: inorganic mineral white oil: 40-60 wt%; styrene: 10-30 wt%; pearlescent powder: 10-30 wt%; silane coupling agent: 0.5-5 wt%.

[0040] Preferably, the modified pearlescent oil comprises the following raw material components in weight percentage: inorganic mineral white oil: 40-50 wt%; styrene: 20-30 wt%; pearlescent powder: 20-30 wt%; silane coupling agent: 0.5-2 wt%.

[0041] Preferably, the inorganic mineral white oil is selected from commercially available No. 7 white oil, No. 9 white oil, and No. 10 white oil, with No. 10 white oil being the most preferred.

[0042] Preferably, the pearlescent powder comprises one or more of the following: mica-coated pearlescent powder, bismuth oxychloride crystalline pearlescent powder, silica-coated pearlescent powder, aluminum silicate-coated pearlescent powder, aluminum borate-coated pearlescent powder, and bismuth oxide-coated pearlescent powder; preferably, the surface of the pearlescent powder is at least coated with a layer of metal oxide, wherein the metal oxide is one or more of aluminum oxide, tin dioxide, titanium dioxide, iron oxide, antimony oxide, or zinc oxide; the particle size of the pearlescent powder is 5-500 μm, preferably 5-200 μm.

[0043] Preferably, the silane coupling agent is an alkyl silane, selected from one or more of hexadecyltrimethoxysilane, n-decyltrimethoxysilane, and dodecyltrimethoxysilane, with hexadecyltrimethoxysilane being the most preferred.

[0044] In one specific embodiment, the styrene is commercially available styrene with a molecular weight of 104.15.

[0045] A second aspect of the present invention provides a method for preparing modified pearlescent pigment oil, comprising the following steps:

[0046] 1) First, mix the white oil and pearl powder evenly, then add styrene and mix again to obtain a mixture;

[0047] 2) Heat the mixture to 50-200°C, then add a silane coupling agent to react and obtain modified pearlescent oil.

[0048] In one specific embodiment, in step 1), the conditions for mixing white oil and pearlescent powder include: mixing at a low speed for 10 to 20 minutes, preferably at a low speed of 100 to 300 r / min.

[0049] In one specific embodiment, the conditions for adding styrene and mixing in step 1) include: mixing at a low speed for 10 to 20 minutes, preferably at a low speed of 100 to 300 r / min.

[0050] Preferably, to accelerate the reaction, step 2) is carried out under ultrasonic conditions.

[0051] In one specific embodiment, in step 2), the mixture is first sonicated for a period of time before reacting. The sonication time is 30-50 minutes, for example, 30 minutes, and the reaction time is 2-4 hours, for example, 4 hours. After the reaction, the mixture is cooled to obtain the modified pearlescent oil.

[0052] A third aspect of the present invention provides the application of the above-mentioned modified pearlescent oil, wherein the modified pearlescent oil, a resin containing styrene monomer, and optionally an additive are mixed to obtain a resin alloy material; wherein the resin containing styrene monomer is selected from one or more of PS resin, SAN resin, ABS resin, MS resin, and MBS resin.

[0053] A fourth aspect of the present invention provides a PS / SAN resin alloy material comprising the following raw material components by weight percentage:

[0054] PS resin: 10-70 wt%; SAN resin: 10-50 wt%; modified pearlescent oil: 0.5-10 wt%; additives: 2-20 wt%.

[0055] Preferably, the PS / SAN resin alloy material comprises the following raw material components by weight percentage:

[0056] PS resin: 50-70 wt%; SAN resin: 20-30 wt%; modified pearlescent oil: 0.5-10 wt%; additives: 2-20 wt%. More preferably, PS resin: 60-65 wt%; SAN resin: 23.5-28 wt%; modified pearlescent oil: 0.5-2 wt%; additives: 2-10 wt%.

[0057] Preferably, the additives include: lubricant: 0.5-5 wt%; antioxidant: 0.5-5 wt%; toughening compatibilizer: 0.5-5 wt%; ultraviolet absorber: 0.5-5 wt%.

[0058] Preferably, the PS resin is selected from commercially available HIPS H888G, H666G, and PH8520, with HIPS H888G from Chi Mei Corporation being the most preferred. This resin has a flow rate of 2–30 g / 10 min and an IZOD notched impact strength ≥10 KJ / m². 2 .

[0059] Preferably, the SAN resin is selected from commercially available SAN, H80F, PN-107, and PN106, with LG Chem's H80F being the most preferred. This resin has a flow rate of 4–30 g / 10 min and an IZOD notched impact strength ≥4 KJ / m². 2 .

[0060] Preferably, the lubricant is selected from amides, stearic acid, and silicones, with stearic acid EBS being the most preferred.

[0061] Preferably, the antioxidant is selected from one or a combination of two hindered phenolic antioxidants or phosphite antioxidants and copolymers thereof, preferably 1010 or 1076.

[0062] Preferably, the toughening compatibilizer is selected from maleic anhydride-grafted PS-g-MAH, maleic anhydride-grafted POE, and maleic anhydride-grafted ABS, with maleic anhydride-grafted PS-g-MAH being the most preferred, and the grafting rate is preferably 0.6% to 1%, for example, 1%.

[0063] Preferably, the ultraviolet absorber is selected from salicylates, benzophenone, or benzotriazole, with benzophenone UV944 being the most preferred.

[0064] The fifth aspect of this invention provides a method for preparing a PS / SAN resin alloy material, comprising the following steps:

[0065] (1) The aforementioned weight percentages of PS resin, SAN resin and additives are mixed to obtain a premix;

[0066] (2) Add the premixed material and modified pearlescent oil to a twin-screw extruder, melt and granulate it through the twin-screw extruder, and cool it to obtain a high-gloss, paint-free PS / SAN alloy material.

[0067] In one specific implementation, the mixing conditions in step (1) include mixing for 5 to 10 minutes using a high-speed mixer, preferably at a speed of 300 to 500 r / min.

[0068] In one specific embodiment, the extrusion temperature of the twin-screw extruder is 100–260°C, preferably 200–220°C.

[0069] In one specific embodiment, in step (2), the premix and modified pearlescent oil are added to the twin-screw extruder from different feed ports; preferably, the premix enters from the main feed port of the twin-screw extruder, and the modified pearlescent oil enters from the side feed port of the twin-screw extruder. Entering from the side feed port can reduce the damage of the equipment screw to the pearlescent powder effect.

[0070] In this application, the melting, granulation, and cooling steps described in step (2) above refer to conventional processes and parameters in the industry and will not be repeated here.

[0071] The sixth aspect of this invention also provides the application of PS / SAN resin alloy materials in the fields of injection molding of home appliances, 3C electronic products or toys.

[0072] The present invention will be further described below with reference to the embodiments:

[0073] Examples 1-3 and Comparative Examples 4-7

[0074] Example 1

[0075] Step 1: According to the formula ratio in Table 1, first pour 40 parts of white oil and 30 parts of pearlescent powder into the reactor and mix at 100 r / min for 15 min until fully homogeneous. The particle size of the pearlescent powder is 80 μm. Then add 29.5 parts of styrene and mix at 100 r / min for 15 min until homogeneous. Heat the reactor to 150°C and then add 0.5 parts of hexadecyltrimethoxysilane and sonicate for 40 min. React for 3 hours and then cool to obtain modified pearlescent oil for later use.

[0076] Step 2: Weigh out PS resin, SAN resin, lubricant, compatibility toughening agent, UV absorber, antioxidant, etc. according to the formula ratio and pour them into the mixer. Mix at 400r / min for 6min to obtain the premix.

[0077] Step 3: Add the premixed material to the corresponding loss-in-weight scale at the main feed port of the twin-screw extruder. Add the modified pearlescent oil through the side feeder via the liquid feed loss-in-weight scale. The SHJ50 twin-screw extruder is from Nanjing Koperon, and the equipment has 10 heating zones, each with a temperature of 220°C. The screw speed is 400 rpm, the melt temperature is 230°C, and the torque pressure is 30 kPa. Extrusion granulation is then performed.

[0078] Step 4: Dry the particles obtained in Step 3 at a temperature of 90°C for 40 minutes.

[0079] Step 5: The dried composite granules are processed by injection molding. The injection molding machine barrel temperature is set to 220°C, the injection back pressure is 20 bar, and the mold temperature is 80°C to obtain high-gloss, high-strength, paint-free PS / SAN alloy parts.

[0080] Example 2

[0081] Step 1: According to the formula ratio in Table 1, first pour 45 parts of white oil and 25 parts of pearlescent powder into the reaction vessel and mix at 100 r / min for 15 min until fully homogeneous. The particle size of the pearlescent powder is 80 μm. Then add 29.5 parts of styrene and mix at 100 r / min for 15 min until homogeneous. Heat the reaction vessel to 150°C, then add 1 part of hexadecyltrimethoxysilane and sonicate for 40 min. React for 3 hours, then cool to obtain modified pearlescent color oil for later use.

[0082] Step 2: Weigh out PS resin, SAN resin, lubricant, compatibility toughening agent, UV absorber, antioxidant, etc. according to the formula ratio and pour them into the mixer. Mix at 400r / min for 6min to obtain the premix.

[0083] Step 3: Add the premixed material to the corresponding loss-in-weight scale at the main feed port of the twin-screw extruder. Add the modified pearlescent oil through the side feeder via the liquid feed loss-in-weight scale. The SHJ50 twin-screw extruder is from Nanjing Koperon, and the equipment has 10 heating zones, each with a temperature of 220°C. The screw speed is 400 rpm, the melt temperature is 230°C, and the torque pressure is 30 kPa. Extrusion granulation is then performed.

[0084] Step 4: Dry the particles obtained in Step 3 at a temperature of 90°C for 40 minutes.

[0085] Step 5: The dried composite granules are processed by injection molding. The injection molding machine barrel temperature is set to 220°C, the injection back pressure is 20 bar, and the mold temperature is 80°C to obtain high-gloss, high-strength, paint-free PS / SAN alloy parts.

[0086] Example 3

[0087] Step 1: According to the formula ratio in Table 1, first pour 50 parts of white oil and 20 parts of pearlescent powder into the reactor and mix at 100 r / min for 15 min until fully homogeneous. The particle size of the pearlescent powder is 80 μm. Then add 29.5 parts of styrene and mix at 100 r / min for 15 min until homogeneous. Heat the reactor to 150°C, then add 2 parts of hexadecyltrimethoxysilane and sonicate for 40 min. React for 3 hours, then cool to obtain modified pearlescent oil for later use.

[0088] Step 2: Weigh out PS resin, SAN resin, lubricant, compatibility toughening agent, UV absorber, antioxidant, etc. according to the formula ratio and pour them into the mixer. Mix at 400r / min for 6min to obtain the premix.

[0089] Step 3: Add the premixed material to the corresponding loss-in-weight scale at the main feed port of the twin-screw extruder. Add the modified pearlescent oil through the side feeder via the liquid feed loss-in-weight scale. The SHJ50 twin-screw extruder is from Nanjing Koperon, and the equipment has 10 heating zones, each with a temperature of 220°C. The screw speed is 400 rpm, the melt temperature is 230°C, and the torque pressure is 30 kPa. Extrusion granulation is then performed.

[0090] Step 4: Dry the particles obtained in Step 3 at a temperature of 90°C for 40 minutes.

[0091] Step 5: The dried composite granules are processed by injection molding. The injection molding machine barrel temperature is set to 220°C, the injection back pressure is 20 bar, and the mold temperature is 80°C to obtain high-gloss, high-strength, paint-free PS / SAN alloy parts.

[0092] Comparative Example 4

[0093] Step 1: According to the formula ratio in Table 1, first pour 40 parts of white oil and 30 parts of pearlescent powder into the reaction vessel and mix at 100 r / min for 15 min until fully homogeneous. Then add 29.5 parts of acrylic acid and mix at a low speed of 100 r / min for 15 min until homogeneous. Heat the reaction vessel to 150℃, then add 0.5 parts of hexadecyltrimethoxysilane and sonicate for 40 min. React for 3 hours, then cool to obtain modified pearlescent oil for later use.

[0094] Step 2: Weigh out PS resin, SAN resin, lubricant, compatibility toughening agent, UV absorber, antioxidant, etc. according to the formula ratio and pour them into the mixer. Mix at 400r / min for 6min to obtain the premix.

[0095] Step 3: Add the premixed material to the corresponding loss-in-weight scale at the main feed port of the twin-screw extruder. Add the modified pearlescent oil through the side feeder via the liquid feed loss-in-weight scale. The SHJ50 twin-screw extruder is from Nanjing Koperon, and the equipment has 10 heating zones, each with a temperature of 220°C. The screw speed is 400 rpm, the melt temperature is 230°C, and the torque pressure is 30 kPa. Extrusion granulation is then performed.

[0096] Step 4: Dry the particles obtained in Step 3 at a temperature of 90°C for 40 minutes.

[0097] Step 5: The dried composite granules are processed by injection molding. The injection molding machine barrel temperature is set to 220°C, the injection back pressure is 20 bar, and the mold temperature is 80°C to obtain high-gloss, high-strength, paint-free PS / SAN alloy parts.

[0098] Comparative Example 5

[0099] Step 1: According to the formula ratio in Table 1, first pour 40 parts of white oil and 30 parts of pearlescent powder into the reactor and mix at 100 r / min for 15 min until fully homogeneous. Then add 29.5 parts of styrene and mix at 100 r / min for 15 min until homogeneous. Heat the reactor to 150℃, then add 0.5 parts of aluminate coupling agent and sonicate for 40 min. React for 3 hours, then cool to obtain modified pearlescent oil for later use.

[0100] Step 2: Weigh out PS resin, SAN resin, lubricant, compatibility toughening agent, UV absorber, antioxidant, etc. according to the formula ratio and pour them into the mixer. Mix at 400r / min for 6min to obtain the premix.

[0101] Step 3: Add the premixed material to the corresponding loss-in-weight scale at the main feed port of the twin-screw extruder. Add the modified pearlescent oil through the side feeder via the liquid feed loss-in-weight scale. The SHJ50 twin-screw extruder is from Nanjing Koperon, and the equipment has 10 heating zones, each with a temperature of 220°C. The screw speed is 400 rpm, the melt temperature is 230°C, and the torque pressure is 30 kPa. Extrusion granulation is then performed.

[0102] Step 4: Dry the particles obtained in Step 3 at a temperature of 90°C for 40 minutes.

[0103] Step 5: The dried composite granules are processed by injection molding. The injection molding machine barrel temperature is set to 220°C, the injection back pressure is 20 bar, and the mold temperature is 80°C to obtain high-gloss, high-strength, paint-free PS / SAN alloy parts.

[0104] Comparative Example 6

[0105] Step 1: According to the formula ratio in Table 1, first pour 45 parts of white oil and 25 parts of pearlescent powder into the reactor and mix at 100 r / min for 15 min until fully homogeneous. Then add 29 parts of styrene and mix at 100 r / min for 15 min until homogeneous. Heat the reactor to 150°C and then add 1 part of hexadecyltrimethoxysilane and sonicate for 40 min. React for 3 hours and then cool to obtain modified pearlescent oil for later use.

[0106] Step 2: Weigh out PS resin, SAN resin, lubricant, compatibility toughening agent, UV absorber, antioxidant, etc. according to the formula ratio and pour them into the mixer. Mix at 400r / min for 6min to obtain the premix.

[0107] Step 3: Add the premixed material to the corresponding loss-in-weight scale at the main feed port of the twin-screw extruder. Add the modified pearlescent oil through the side feeder via the liquid feed loss-in-weight scale. The SHJ50 twin-screw extruder is from Nanjing Koperon, and the equipment has 10 heating zones, each with a temperature of 220°C. The screw speed is 400 rpm, the melt temperature is 230°C, and the torque pressure is 30 kPa. Extrusion granulation is then performed.

[0108] Step 4: Dry the particles obtained in Step 3 at a temperature of 90°C for 40 minutes.

[0109] Step 5: The dried composite granules are processed by injection molding. The injection molding machine barrel temperature is set to 220°C, the injection back pressure is 20 bar, and the mold temperature is 80°C to obtain high-gloss, high-strength, paint-free PS / SAN alloy parts.

[0110] Comparative Example 7

[0111] Step 1: Weigh the PS resin, SAN resin, lubricant, compatibility toughening agent, UV absorber, antioxidant, etc. according to the formula ratio in Table 1, pour them into the mixer, mix at 400r / min for 6min to obtain the premix.

[0112] Step 2: Add the premixed material to the corresponding loss-in-weight scale at the main feed port of the twin-screw extruder, and add the pearl powder to the corresponding loss-in-weight scale at the side feed port of the twin-screw extruder. The pearl powder has a particle size of 80μm. The SHJ50 twin-screw extruder is from Nanjing Koperon, and the equipment has 10 heating zones, each with a temperature of 220℃, a screw speed of 400rpm, a melt temperature of 230℃, and a torque pressure of 30kPa. Extrusion granulation is then performed.

[0113] Step 4: Dry the particles obtained in Step 3 at a temperature of 90°C for 40 minutes.

[0114] Step 5: The dried composite granules are processed by injection molding. The injection molding machine barrel temperature is set to 220°C, the injection back pressure is 20 bar, and the mold temperature is 80°C to obtain high-gloss, high-strength, paint-free PS / SAN alloy parts.

[0115] Materials used in the examples and comparative examples:

[0116] 1. The white oil is Total G232H Industrial 10# White Oil.

[0117] 2. The pearlescent powder is from Merck, specifically Iriodin 163 pearlescent pigment.

[0118] 3. Silane coupling agent, Nanjing Xuanhao Company, KH550

[0119] 4. The aluminate coupling agent is Hubei Yamed Company, DL411.

[0120] 5. Acrylic acid is produced by Wanhua Chemical, with a molecular weight of 72.063.

[0121] 6. Styrene is produced by Wanhua Chemical, with a molecular weight of 104.15.

[0122] 7. The PS resin is commercially available HIPS H888G from Chi Mei Industrial Co., Ltd.

[0123] 8. The SAN resin is commercially available LG Chem H80F.

[0124] Table 1. Formulation, appearance, and performance test results of Examples 1-3 and Comparative Examples 4-6

[0125]

[0126]

[0127] Note: Color paint-free effect and paint-free flow marks are divided into: obvious, moderately obvious, slightly obvious, none, and poor dispersion.

[0128] Therefore, it can be seen that the high-gloss, high-strength, paint-free PS / SAN alloy materials prepared in Examples 1-3 of this invention, compared with Comparative Examples 4, 5, 6, and 7, exhibit better compatibility and dispersibility with resin materials due to the inorganic mineral white oil used to impregnate and coat the pearlescent powder, while simultaneously adding styrene monomer and silane coupling agent for modification. This solves the problem of traditional pearlescent flow marks during product processing and significantly improves the material's gloss and impact strength, thereby expanding its application areas. Furthermore, the acrylic polymer used in Comparative Example 4 has a different molecular structure from the styrene monomer resin, resulting in poor compatibility. The aluminate coupling agent in Comparative Example 5 is suitable for surface coupling of inorganic filler materials, but the aluminate monomer itself has certain side effects on the material, thus degrading its performance. Comparative Example 6 uses excessive modified pearlescent oil; the optimal addition amount is 0.5-2%. Excessive addition can lead to agglomeration and poor dispersion of the pearlescent powder within the material. Comparative Example 7 uses unmodified pearlescent powder, resulting in significantly deteriorated performance in all aspects.

[0129] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is impossible to exhaustively list all embodiments here. All obvious variations or modifications derived from the technical solutions of the present invention are within the spirit and scope of the present invention.

Claims

1. A modified pearlescent pigment for resin alloy materials, characterized in that, The resin alloy material comprises modified pearlescent oil, styrene monomer-containing resin, and additives. The modified pearlescent oil accounts for 0.5-2 wt% of the mass of the resin alloy material. The modified pearlescent oil is composed of the following raw material components by weight percentage: inorganic mineral white oil: 40-60 wt%; styrene: 10-30 wt%; pearlescent powder: 10-30 wt%; silane coupling agent: 0.5-5 wt%.

2. The modified pearlescent pigment according to claim 1, characterized in that, The raw materials are composed of the following weight percentages: inorganic mineral white oil: 40~50wt%; styrene: 20~30wt%; pearl powder: 20~30wt%; silane coupling agent: 0.5~2wt%.

3. The modified pearlescent pigment according to claim 1 or 2, characterized in that, The inorganic mineral white oil is selected from commercially available No. 7 white oil, No. 9 white oil, and No. 10 white oil; and / or, The pearlescent powder comprises one or more of the following: mica-coated pearlescent powder, bismuth oxychloride crystalline pearlescent powder, silica-coated pearlescent powder, aluminum silicate-coated pearlescent powder, aluminum borate-coated pearlescent powder, and bismuth oxide-coated pearlescent powder; the particle size of the pearlescent powder is 5-500 μm; and / or, The silane coupling agent is an alkyl silane, selected from one or more of hexadecyltrimethoxysilane, n-decyltrimethoxysilane, and dodecyltrimethoxysilane.

4. The modified pearlescent pigment according to claim 3, characterized in that, The inorganic mineral white oil is No. 10 white oil; and / or, The pearlescent powder is coated with at least one layer of metal oxide, which is one or more of aluminum oxide, tin dioxide, titanium dioxide, iron oxide, antimony oxide, or zinc oxide; the pearlescent powder has a particle size of 5-200 μm; and / or, The silane coupling agent is hexadecyltrimethoxysilane.

5. The method for preparing the modified pearlescent pigment as described in any one of claims 1-4, characterized in that, Includes the following steps: 1) First, mix the inorganic mineral white oil and pearlescent powder evenly, then add styrene and mix to obtain a mixture; 2) Heat the mixture to 50~200℃, then add a silane coupling agent to react and obtain modified pearlescent oil.

6. The application of the modified pearlescent oil according to any one of claims 1-4 or the modified pearlescent oil prepared by the method of claim 5, characterized in that, The modified pearlescent oil, the styrene monomer-containing resin, and optionally the additives are mixed to obtain a resin alloy material; the styrene monomer-containing resin is selected from one or more of PS resin, SAN resin, ABS resin, MS resin, and MBS resin.

7. A resin alloy material, characterized in that, The raw material components include the following weight percentages: PS resin: 30~70wt%; SAN resin: 10~60wt%; Modified pearlescent oil: 0.5~2wt%; Additives: 2~20wt%; The modified pearlescent oil is the modified pearlescent oil according to any one of claims 1-4, or the modified pearlescent oil prepared by the method of claim 5.

8. The resin alloy material according to claim 7, characterized in that, The raw material components include the following weight percentages: PS resin: 50~70wt%; SAN resin: 20~30wt%; modified pearlescent pigment: 0.5~2wt%; additives: 2~20wt%.

9. The resin alloy material according to claim 7, characterized in that, The additives include: lubricant: 0.5~5wt%; antioxidant: 0.5~5wt%; toughening compatibilizer: 0.5~5wt%; ultraviolet absorber: 0.5~5wt%; and / or, The PS resin is selected from commercially available HIPS H888G, H666G, and PH8520; and / or, The SAN resin is selected from commercially available H80F, PN-107, and PN106; and / or, The lubricant is selected from amides, stearic acid, silicones; and / or, The antioxidant is selected from one or a combination of two of hindered phenolic antioxidants or phosphite antioxidants and their copolymers; The toughening compatibilizer is selected from maleic anhydride-grafted PS-g-MAH, maleic anhydride-grafted POE, and maleic anhydride-grafted ABS. The ultraviolet absorber is selected from salicylates, benzophenone, or benzotriazole.

10. The resin alloy material according to claim 9, characterized in that, The PS resin is HIPS H888G; and / or, The SAN resin is H80F; and / or, The lubricant is stearic acid-based EBS; and / or... The antioxidants are 1010 and 1076; The toughening compatibilizer is maleic anhydride grafted PS-g-MAH; The ultraviolet absorber is benzophenone UV944.

11. The method for preparing the resin alloy material according to any one of claims 7-10, characterized in that, Includes the following steps: (1) Mix PS resin, SAN resin and additives to obtain a premix; (2) Add the premixed material and modified pearlescent oil to a twin-screw extruder, melt and granulate it through the twin-screw extruder, and cool it to obtain a high-gloss, paint-free PS / SAN alloy material.

12. The method for preparing the resin alloy material according to claim 11, characterized in that, The extrusion temperature of the twin-screw extruder is 100~260℃; and / or, In step (2), the premix and modified pearlescent oil are added to the twin-screw extruder through different feed ports.

13. The method for preparing the resin alloy material according to claim 12, characterized in that, The extrusion temperature of the twin-screw extruder is 200~220℃; and / or, In step (2), the premixed material enters from the main feed port of the twin-screw extruder, and the modified pearlescent oil enters from the side feed port of the twin-screw extruder.

14. The application of the resin alloy material as described in any one of claims 7-10 or the resin alloy material prepared by any one of claims 11-13, for injection molding of household appliances, 3C electronic products or toy products.

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