A spray-free, mottled effect polycarbonate plastic material and a method for producing the same

Abstract

The present application relates to a kind of spray-free flow effect polycarbonate (PC) plastic material and its preparation method;Its preparation process includes the following steps: (1) preparation flow effect color master batch, material includes: polyethylene terephthalate resin (PET), rubber powder, antioxidant 1#, antioxidant 2#, lubricant, weathering agent, color powder;(2) spray-free flow effect polycarbonate (PC) plastic material, material includes: polycarbonate (PC), plasticizer, toughening agent, antioxidant 1#, antioxidant 2#, lubricant, weathering agent, color powder, prepared polycarbonate (PC) plastic material is added one or more than one step (1) preparation flow effect color master batch, mechanically mixed to obtain a kind of spray-free flow effect polycarbonate (PC) plastic material, after injection molding processing, it can be made into a kind of spray-free flow effect plastic product with mechanical properties, aesthetics.

Description

Technical Field

[0001] This invention belongs to the field of paint-free plastics and relates to a paint-free polycarbonate (PC) plastic material with a flow texture effect and its preparation method. Background Technology

[0002] Paint-free plastics are aesthetically pleasing plastic products that can be injection molded in one step without the need for painting. Eliminating the need for painting shortens the production cycle, saves energy, is environmentally friendly, and reduces costs. At the same time, they can give the product surface a natural, eco-friendly aesthetic texture, enriching the consumer's visual experience. With the development of paint-free materials, various differentiated appearance effects are constantly being developed to meet the personalized requirements of different application scenarios.

[0003] The paint-free flow pattern effect has a variety of unique textures and aesthetic appearances, which can simulate marble, wood grain, amber and other effects, making it popular with consumers. The paint-free flow pattern effect is achieved by adding flow pattern masterbatch to the base material. The melting point of the flow pattern masterbatch is higher than that of the base material. By utilizing the temperature difference between the plasticizing base material and the flow pattern masterbatch, the base material melts during the injection molding process, while the flow pattern masterbatch is in a semi-molten state. This allows the flow pattern masterbatch to flow and distribute naturally on the surface of the product during the injection molding process, thus producing the flow pattern effect. Chinese invention patent CN114634636A discloses a masterbatch with fluorescent flow pattern effect, its preparation method, and its application. The base material is ABS material, and the flow pattern masterbatch components include PBT resin, PET resin, ABS resin, etc. Chinese patent CN113214566A discloses a masterbatch for injection molding of PC / ABS material, its preparation method, and its application. The base material is PC / ABS material, and the flow pattern masterbatch contains the following components: PC resin, PET resin, etc. Therefore, the necessary condition for forming flow patterns is that the injection temperature of the flow pattern masterbatch must be higher than the injection processing temperature of the base material. If the flow pattern masterbatch is lower than the injection processing temperature of the base material, the masterbatch will completely melt and the flow pattern effect cannot be formed.

[0004] Polycarbonate (PC) is one of the five major engineering plastics, possessing excellent mechanical properties, good surface gloss, and high temperature resistance. It is widely used in industries such as electronics, automobiles, and construction. However, the flow pattern effect of PC is difficult to achieve due to the high injection molding temperature of PC material, typically 280–300℃. Currently, some flow pattern masterbatches are processed at temperatures lower than the injection molding temperature of PC material. At the injection molding temperature of PC, the flow pattern masterbatch completely melts, making it impossible to form a flow pattern effect. Summary of the Invention

[0005] The purpose of this invention is to address the problems existing in the prior art by providing a paint-free polycarbonate (PC) plastic material with a flow texture effect and its preparation method.

[0006] The flow pattern effect is achieved by adding flow masterbatch, which has a processing temperature higher than the base material, to the base material. During injection molding, the base material melts, while the flow masterbatch remains in a semi-molten state. Polycarbonate (PC) is a high-temperature rigid plastic and is not suitable for creating flow patterns on conventional PC substrates. Due to its poor flowability and high injection temperature (typically 280–300°C), the flow masterbatch melts completely at this temperature. Coloring the PC with the masterbatch's color only serves as a color masterbatch and does not create the flow pattern effect. To prevent the flow masterbatch from melting completely at the PC's injection temperature, thus failing to create the flow pattern effect, this invention introduces a plasticizer during the preparation of the PC base material. The plasticizer lowers the PC's injection processing temperature and improves its flow properties, resulting in a PC base material with an injection temperature lower than the flow pattern temperature. The processing temperature of the masterbatch utilizes the temperature difference between the plasticizing base material and the flow pattern masterbatch during the injection molding process (preferably 20°C). The PC base material is completely melted while the flow pattern masterbatch is in a semi-molten state, forming a flow pattern effect. The flow pattern masterbatch of this invention uses crystalline polyethylene terephthalate resin (PET) and styrene-acrylonitrile-butadiene rubber powder, SEBS or SBS, whose flowability is less affected by temperature, to improve the stability of the flow pattern masterbatch and make the flow pattern effect more stable and natural.

[0007] The objective of this invention can be achieved through the following methods:

[0008] This invention provides a paint-free polycarbonate (PC) plastic material with a flowing texture effect. The paint-free polycarbonate (PC) plastic material with a flowing texture effect includes a polycarbonate (PC) base material and a flowing texture effect color masterbatch; it can be mechanically mixed. The addition ratio of the flowing texture effect color masterbatch is 0.5% to 10% of the weight of the polycarbonate (PC) base material, depending on the appearance requirements of the client.

[0009] The polycarbonate (PC) base material comprises the following components in parts by weight:

[0010]

[0011] The flow-texture effect masterbatch comprises the following components in parts by weight:

[0012]

[0013]

[0014] The masterbatch base material of this invention is suitable for PC with high processing temperatures, while PBT has a lower processing temperature and is more suitable for base materials with lower processing temperatures, forming a flow pattern masterbatch. If this flow pattern masterbatch is added to conventional PC to reduce the temperature difference, a significant flow pattern effect cannot be formed. This invention selects crystalline material PET, which can form a semi-molten state at injection molding temperature. PC is a non-crystalline material, and at higher temperatures, the color of the masterbatch is more likely to melt into the PC base material, resulting in poor stability of the flow pattern.

[0015] As one embodiment of the present invention, the polycarbonate resin (PC) has a melt index of 10 to 303 / 10min when tested at 300°C and 31.233°C.

[0016] In one embodiment of the present invention, the plasticizer includes one or more of triphenyl phosphate, tricresyl phosphate, resorcinol bis(diphenyl phosphate), bisphenol A bis(diphenyl phosphate), and bisphenol A diphosphate. Compared to phosphates, the phosphate esters of the present invention have less impact on toughness and can lower the injection molding temperature of PC. Furthermore, a toughening agent is added to compensate for the impact of phosphate esters on toughness.

[0017] In one embodiment of the present invention, the toughening agent is methyl methacrylate-butadiene-styrene terpolymer (MBS); the polybutadiene content is 50% to 70%.

[0018] As one embodiment of the present invention, antioxidant 1# includes one of antioxidant 1010 or antioxidant 1076.

[0019] In one embodiment of the present invention, antioxidant 2# includes either antioxidant 168 or antioxidant 300. The two antioxidants have different mechanisms of action, resulting in higher efficiency when combined.

[0020] In one embodiment of the present invention, the lubricant is high heat-resistant PETS.

[0021] In one embodiment of the present invention, the weathering agent is a hydroxyphenylbenzotriazole.

[0022] As one embodiment of the present invention, the color powder includes one or more of pigments and effect powders; the effect powder includes one or more of metals, pearlescent materials, glass, and mica. The color powder is not limited to conventional pigments, but also includes effect powders such as metals, pearlescent materials, glass, and mica, depending on the actual color matching requirements.

[0023] As one embodiment of the present invention, the intrinsic viscosity of the polyethylene terephthalate resin (PET) is 0.8 dl / 3 to 1.2 dl / 3.

[0024] As one embodiment of the present invention, the rubber powder includes one or more of styrene-acrylonitrile-butadiene rubber, SEBS, and SBS.

[0025] The present invention also provides a method for preparing the aforementioned paint-free flow textured polycarbonate (PC) plastic material, comprising the following steps:

[0026] (1) Preparation of flow-textured color masterbatch

[0027] Polyethylene terephthalate resin (PET), rubber powder, antioxidant 1#, antioxidant 2#, lubricant, weather resistant agent, and color powder are mixed and then added to a twin-screw extruder. After melt extrusion and granulation, the resulting flow-textured color masterbatch is ready for use.

[0028] (2) Preparation of polycarbonate (PC) base material

[0029] Polycarbonate (PC), plasticizer, toughening agent, antioxidant 1#, antioxidant 2#, lubricant, weather resistant agent, and color powder are mixed and then fed into a twin-screw extruder. The mixture is then melt-extruded and granulated to obtain a polycarbonate (PC) base material.

[0030] (3) Preparation of spray-free flow textured polycarbonate (PC) plastic materials

[0031] By mechanically mixing the masterbatch with the flow-textured effect and the polycarbonate (PC) base material, a paint-free flow-textured polycarbonate (PC) plastic material can be obtained.

[0032] In one embodiment of the present invention, in step (1), the temperatures of zones one through five of the twin-screw extruder are 215-225℃, 235-245℃, 245-255℃, 245-255℃, and 255-265℃ respectively, and the twin-screw speed is 400-500 r / min. Preferably, the temperatures are 220℃, 240℃, 250℃, 250℃, and 260℃.

[0033] In one embodiment of the present invention, in step (2), the temperatures of zones one through five of the twin-screw extruder are 215-225℃, 235-245℃, 245-255℃, 255-265℃, and 265-275℃ respectively, and the twin-screw speed is 400-500 r / min. Preferably, the temperatures are 220℃, 240℃, 250℃, 260℃, and 270℃.

[0034] The present invention also provides a plastic part prepared using the aforementioned paint-free flow-textured polycarbonate (PC) plastic material, which is prepared by the following method: the paint-free flow-textured polycarbonate (PC) plastic material is injection molded, the injection molding machine is set to 215-225℃, 240-250℃, 240-250℃, 260-270℃, the plasticizing back pressure is 0.2-0.4 MPa, the injection pressure is 18-22 MPa for the first stage, 28-32 MPa for the second stage, and 38-42 MPa for the third stage, and the holding pressure and cooling time is 7-9 seconds. After injection molding, a paint-free flow-textured polycarbonate (PC) plastic part can be obtained. Preferably, the injection molding machine is set to 220℃, 245℃, 245℃, and 265℃; the plasticizing back pressure is 0.3 MPa; the injection pressure is 20 MPa for the first stage, 30 MPa for the second stage, and 40 MPa for the third stage; and the holding pressure and cooling time is 8 seconds.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] (1) In order to prevent the flow pattern masterbatch from melting completely at the injection temperature of PC and thus failing to form the flow pattern effect, the present invention introduces a plasticizer when preparing the PC base material. The introduction of the plasticizer can reduce the processing temperature of PC. The prepared PC base material can be processed at a temperature lower than that of the flow pattern masterbatch, thereby utilizing the temperature difference between the plasticization of the base material and the flow pattern masterbatch to form the flow pattern effect.

[0037] (2) The flow pattern masterbatch uses crystalline polyethylene terephthalate resin (PET) and styrene-acrylonitrile-butadiene rubber powder with low flowability affected by temperature, SEBS or SBS, to improve the stability of the flow pattern masterbatch and make the flow pattern effect more stable and natural. Detailed Implementation

[0038] The present invention will be described in detail below with reference to embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several adjustments and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0039] The following describes a spray-free flow textured polycarbonate (PC) plastic material and its preparation method, both following the steps described in the embodiments:

[0040] (1) To prepare the flow-textured effect color masterbatch, polyethylene terephthalate resin (PET), rubber powder, antioxidant 1#, antioxidant 2#, lubricant, weathering agent and color powder were mixed and then added to a twin-screw extruder. The temperatures of the first to fifth zones of the twin-screw extruder were 220℃, 240℃, 250℃, 250℃ and 260℃ respectively. The twin screw speed was 500r / min. The masterbatch was melt extruded and granulated to obtain the flow-textured effect color masterbatch, which was ready for use.

[0041] (2) Spray-free flow texture effect polycarbonate (PC) plastic material: after mixing polycarbonate (PC), plasticizer, toughening agent, antioxidant 1#, antioxidant 2#, lubricant, weathering agent and color powder, it is added to a twin-screw extruder. The temperature of the first to fifth zones of the twin-screw extruder is 220℃, 240℃, 250℃, 260℃ and 270℃ respectively. The twin screw speed is 500r / min. After melt extrusion and granulation, the polycarbonate (PC) plastic material is obtained.

[0042] (3) Adding polycarbonate (PC) plastic material The flow effect masterbatch prepared in step (1) is mechanically mixed and added at a ratio of 1% of the weight of the polycarbonate (PC) plastic material, thus obtaining a non-spraying flow effect polycarbonate (PC) plastic material.

[0043] The composition of the flow-textured polycarbonate (PC) plastic material with spray-free flow texture effect and its preparation method in the embodiments are shown in Tables 1 and 2.

[0044] Table 1. Formulation ratio of flow-textured masterbatch for a paint-free polycarbonate (PC) plastic material.

[0045]

[0046]

[0047] Table 2. Proportioning of PC base material for a paint-free polycarbonate (PC) plastic material with a flowing texture effect.

[0048]

[0049] The masterbatch with flow pattern in Table 1 has a PET resin viscosity of 0.80 dl / 3;

[0050] The rubber powder is styrene-acrylonitrile-butadiene rubber;

[0051] Antioxidant #1 is Antioxidant 1010;

[0052] Antioxidant #2 is Antioxidant 168;

[0053] The lubricant is high heat-resistant PETS;

[0054] The weathering agent is UV-P;

[0055] The pigment is carbon black;

[0056] In Table 2, the PC base material, polycarbonate resin (PC), has a melt index of 203 / 10min when tested at 300℃ and 31.233℃.

[0057] The plasticizer is triphenyl phosphate;

[0058] The toughening agent is methyl methacrylate-butadiene-styrene terpolymer (MBS); its polybutadiene content is 50%;

[0059] The antioxidant 1# is antioxidant 1010;

[0060] The antioxidant 2# is antioxidant 168;

[0061] The lubricant is high heat-resistant PETS;

[0062] The weathering agent is UV-P;

[0063] The pigment is titanium dioxide;

[0064] Examples 1-16

[0065] A paint-free polycarbonate (PC) plastic material with a flow texture effect and its preparation method are disclosed in Table 3.

[0066] Table 3. Components of a paint-free polycarbonate (PC) plastic material with a flowing texture effect.

[0067] Example Flow pattern masterbatch PC base material Example 1 1-1 2-4 Example 2 1-2 2-4 Example 3 1-3 2-4 Example 4 1-4 2-4 Example 5 1-5 2-4 Example 6 1-6 2-4 Example 7 1-7 2-4 Example 8 1-2 2-1 Example 9 1-2 2-2 Example 10 1-2 2-3 Example 11 1-2 2-4 Example 12 1-2 2-5 Example 13 1-2 2-6 Example 14 1-2 2-7 Example 15 1-2 2-8 Example 16 1-2 2-9

[0068] Example 17

[0069] The difference from Example 1 is that the viscosity of the PET resin is 1.2 dl / 3;

[0070] Example 18

[0071] The difference from Example 3 is that the rubber powder is SEBS;

[0072] Example 19

[0073] The difference from Example 3 is that the rubber powder is SBS;

[0074] Example 20

[0075] The difference from Example 3 is that the polycarbonate resin (PC) tested at 300°C and 31.233°C had a melt index of 303 / 10min;

[0076] Example 21

[0077] The difference from Example 3 is that the plasticizer is bisphenol A diphosphate;

[0078] Comparative Example 1

[0079] The difference from Example 1 is that no plasticizer is used.

[0080] Comparative Example 2

[0081] The difference from Example 1 is that the prepared flow pattern masterbatch contains only 100 parts of PET, 0.2 parts of antioxidant 1#, 0.2 parts of antioxidant 2#, 0.3 parts of lubricant, 0.3 parts of weathering agent, and 1 part of color powder.

[0082] Comparative Example 3

[0083] The difference from Example 1 is that 100 parts of PET resin are replaced with 60 parts of PET resin and 40 parts of PC resin.

[0084] Comparative Example 4

[0085] The difference from Example 1 is that 100 parts of PET resin are replaced with 60 parts of PET resin and 40 parts of PBT resin.

[0086] Both the examples and comparative examples were prepared using the following methods, and their appearance was inspected:

[0087] The paint-free flow-textured polycarbonate (PC) plastic material is injection molded. The injection molding machine is set to 220℃, 245℃, 245℃, and 265℃. The plasticizing back pressure is 0.3 MPa, and the injection pressure is 20 MPa for the first stage, 30 MPa for the second stage, and 40 MPa for the third stage. The holding pressure and cooling time is 8 seconds. After injection molding, paint-free flow-textured polycarbonate (PC) plastic parts can be obtained.

[0088] The performance of the two processing temperatures in the above embodiments and comparative examples was evaluated and compared using three dimensions: "masterbatch not melting, masterbatch completely melting and penetrating the substrate, and flow pattern effect." As shown in Table 4:

[0089] Table 4 Flow Pattern Effect

[0090]

[0091]

[0092] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A paint-free polycarbonate plastic material with a flow pattern effect, characterized in that, The paint-free polycarbonate plastic material with a flowing texture effect includes a polycarbonate base material and a flowing texture effect masterbatch, wherein the addition ratio of the flowing texture effect masterbatch is 0.5% to 10% of the weight of the polycarbonate base material. The polycarbonate base material consists of the following components in parts by weight. composition: 100 parts of polycarbonate resin 10-15 parts plasticizer Toughening agent 2-8 parts, Antioxidant 1# 0.1-0.3 parts, Antioxidant #2, 0.1-0.3 parts. Lubricant 0.5-3 parts, Weather resistant agent 0.3-1.2 parts, Color powder 0.1 to 1 part; The flow-texture effect masterbatch consists of the following components in parts by weight. composition: 100 parts of polyethylene terephthalate resin, 5-12 parts of rubber powder, Antioxidant 1# 0.2-0.5 parts, Antioxidant #2, 0.2-0.5 parts. Lubricant 0.3 to 1 part, Weather resistant agent 0.3-1.2 parts, 1-3 parts of color powder; The rubber powder is styrene-acrylonitrile-butadiene rubber.

2. The paint-free flow texture polycarbonate plastic material according to claim 1, characterized in that, The polycarbonate resin, when tested at 300℃*1.2kg, has a melt index of 10~30g / 10min.

3. The paint-free flow texture polycarbonate plastic material according to claim 1, characterized in that, The plasticizer includes one or more of triphenyl phosphate, tricresyl phosphate, resorcinol bis(diphenyl phosphate), and bisphenol A bis(diphenyl phosphate).

4. The paint-free flow texture polycarbonate plastic material according to claim 1, characterized in that, The toughening agent is a methyl methacrylate-butadiene-styrene terpolymer; its polybutadiene content is 50% to 70%.

5. The paint-free flow texture polycarbonate plastic material according to claim 1, characterized in that, The antioxidant 1# includes antioxidant 1010 or antioxidant 1076; the antioxidant 2# includes antioxidant 168 or antioxidant 300.

6. The paint-free flow texture polycarbonate plastic material according to claim 1, characterized in that, The lubricant is high heat-resistant PETS; the weather-resistant agent is hydroxyphenylbenzotriazole; the colorant includes effect powder; the effect powder includes one or more of metal, pearl, glass, and mica.

7. The paint-free flow texture polycarbonate plastic material according to claim 1, characterized in that, The intrinsic viscosity of the polyethylene terephthalate resin is 0.8 dl / g to 1.2 dl / g.

8. A method for preparing a spray-free flow textured polycarbonate plastic material as described in claim 1, characterized in that, Includes the following steps: (1) Preparation of flow texture effect masterbatch Polyethylene terephthalate resin, rubber powder, antioxidant 1#, antioxidant 2#, lubricant, weather resistant agent, and color powder are mixed and then added to a twin-screw extruder. After melt extrusion granulation, the resulting flow-textured color masterbatch is ready for use. (2) Preparation of polycarbonate base material Polycarbonate, plasticizer, toughening agent, antioxidant 1#, antioxidant 2#, lubricant, weathering agent, and color powder are mixed and then added to a twin-screw extruder. The mixture is then melt-extruded and granulated to obtain a polycarbonate base material. (3) Preparation of polycarbonate plastic material with flow texture effect without spraying By mechanically mixing the masterbatch with the flow-textured effect and the polycarbonate base material, a paint-free flow-textured polycarbonate plastic material can be obtained.

9. A plastic part prepared using the paint-free flow texture effect polycarbonate plastic material as described in claim 1, characterized in that, The plastic parts are prepared by the following method: the paint-free flow texture effect polycarbonate plastic material is injection molded, the injection temperature is set to 215-225℃, 240-250℃, 240-250℃, 260-270℃, the plasticizing back pressure is 0.2-0.4Mpa, the injection pressure is 18-22Mpa for the first stage, 28-32Mpa for the second stage, and 38-42Mpa for the third stage, and the holding pressure and cooling time is 7-9s. After injection molding, the paint-free flow texture effect polycarbonate plastic parts are obtained.

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