LCP (Liquid Crystal Polymer) flocked dot imitating material as well as preparation method and application thereof

Abstract

The invention provides an LCP imitation flocking point material and a preparation method and application thereof.The LCP imitation flocking point material comprises an LCP resin sheet prepared from LCP resin, and the LCP resin is selected as the material, so that the obtained LCP imitation flocking point material has the advantages of being low in density, adjustable in size and shape and small in dosage; furthermore, the obtained LCP flocked dot-imitated material is added into resin, so that a relatively high flocked dot-imitated emerging rate is achieved, and the mechanical property of the resin is not influenced, and the obtained composition containing the LCP flocked dots also has excellent impact resistance on the premise of having a spot effect, and can be widely applied to the industries of automobile interior and exterior decoration, household appliances, consumer electronics and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of imitation flocking dots, and in particular relates to an LCP imitation flocking dot material and a preparation method and application thereof. Background Art

[0002] Plastic parts with spotted aesthetic effects have gradually gained attention in industries such as automotive interior and exterior decoration, home appliances and consumer electronics due to their integrated molding characteristics, and have formed a green and low-carbon trend.

[0003] The materials used for speckle effects on the current market mainly include aluminum-based onion powder, mica sheets and polyester chips; among them, aluminum-based onion powder has a higher emergence rate, but its metal effect lacks a natural feel when paired with resin. Although polyester chips have a better match with resin, their speckle aesthetic effect and emergence rate are relatively poor. Mica sheets are currently the most widely used raw materials for speckle effects. The combination of white mica sheets and plastic base colors meets the needs of aesthetic design. However, the layered structure of mica sheets is destined to be not resistant to screw shearing, resulting in a large amount of addition required during the application process (1-2wt%), which will not only increase costs, but also cause a significant decrease in the impact strength of the final plastic parts. Therefore, it is urgent to find new imitation flocking point materials.

[0004] CN113861561A discloses a flocking-like polypropylene composite material, a preparation method and an application thereof. Although the flocking-like polypropylene composite material provided by the invention has good flocking-like aesthetic effect, antibacterial and antimicrobial effect and odor removal and dust removal properties, it does not pay attention to the mechanical properties of the obtained flocking-like polypropylene composite material.

[0005] CN117183202A discloses a flocking-like plastic part and a preparation method thereof; the invention focuses more on improving the injection molding process of the flocking-like plastic part, and also does not pay attention to the mechanical properties of the obtained flocking-like plastic part.

[0006] Therefore, developing an LCP imitation flocking point material with high emergence rate, low dosage and no influence on the mechanical properties of plastic parts is still a technical problem that needs to be solved urgently in this field. Summary of the invention

[0007] In view of the shortcomings of the prior art, the purpose of the present invention is to provide an LCP imitation flocking point material and a preparation method and application thereof. The LCP imitation flocking point material has the characteristics of low density, adjustable size and shape, and small dosage. It is further added to the resin to achieve a high emergence rate at a low addition amount without affecting the mechanical properties of the plastic parts, so that the obtained imitation flocking point plastic parts can be widely used in industries such as automotive interior and exterior decoration, home appliances and consumer electronics.

[0008] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0009] In a first aspect, the present invention provides an LCP imitation flocking dot material, wherein the LCP imitation flocking dot material comprises an LCP resin sheet prepared from an LCP resin;

[0010] The melting point of the LCP resin is 280-400° C. (e.g., 280° C., 300° C., 320° C., 340° C., 360° C., 380° C., or 400° C.);

[0011] The thickness of the LCP resin sheet is 25 to 100 nm (eg, 25 nm, 30 nm, 35 nm, 40 nm, 50 nm, 60 nm, 70 nm, 80 nm, 90 nm or 100 nm, etc.).

[0012] The present invention adopts an LCP resin sheet with a thickness of 25 to 100 nm prepared from an LCP resin with a melting point of 280 to 400° C. as a flocking-like dot material, which not only has the characteristics of low density and adjustable size and shape, but also can achieve the same emergence rate under the premise of reducing the addition amount of mica sheets in the resin by 50wt% compared with conventional flocking-like dots, and the emergence rate is high, and the mechanical properties of the resin itself are not affected, so that the obtained flocking-like dot plastic part has excellent impact resistance while having a spot effect.

[0013] In the present invention, the thickness of the LCP resin sheet is directly measured by using a step profiler to measure the LCP resin film sample, specifically by using a mechanical probe to scan the step height difference between the LCP resin film and the substrate, which is the thickness of the LCP resin sheet.

[0014] In the present invention, the specific type of the LCP resin is not particularly limited, as long as its melting point meets the requirements, a fully aromatic LCP resin or a non-fully aromatic LCP resin can be selected, for example, a liquid crystal polyester or a liquid crystal polyamide can be selected.

[0015] In the present invention, there is no special limitation on the molding method of the LCP resin sheet. For example, the LCP resin can be blown into a film to obtain an LCP resin film, and then the obtained LCP resin film can be sheared to obtain an LCP flocking dot material of target size and shape.

[0016] Preferably, the melting point of the LCP resin is 290-340°C.

[0017] In the present invention, the melting point of the LCP resin can be tested by referring to the method provided in ISO 11357-1-2016 standard.

[0018] Preferably, the density of the LCP resin is 1.1 to 1.6 g / cm 3 , for example 1.1 g / cm 3 , 1.15g / cm 3 , 1.2g / cm 3 , 1.25g / cm 3 , 1.3g / cm 3 , 1.35g / cm 3 , 1.4g / cm 3 , 1.5g / cm 3 or 1.6 g / cm 3 wait.

[0019] In the present invention, the test method for the density of the LCP resin can be tested with reference to the method provided in the ISO 1183-1-2019 standard.

[0020] Preferably, the thickness of the LCP resin sheet is 35-75 nm.

[0021] In the present invention, there is no special restriction on the specific shape of the LCP resin sheet, and it can be cut into various shapes as needed. However, in order to ensure that the obtained LCP imitation flocking point material has a high flocking point emergence rate in the resin and does not affect the mechanical properties of the resin itself, it is preferred to limit the longest diameter of the LCP resin sheet to ≤5mm and ≥0.001mm, and the shortest diameter to ≥0.001mm and ≤5mm.

[0022] In the present invention, the longest diameter of the LCP resin sheet refers to the distance of the longest straight line on the LCP resin sheet, which can be obtained by testing with a vernier caliper combined with a scanning electron microscope; the shortest diameter of the LCP resin sheet refers to the distance of the shortest straight line on the LCP resin sheet, which can be obtained by testing with a vernier caliper combined with a scanning electron microscope.

[0023] Preferably, a coating is also attached to the surface of the LCP resin sheet, and the material of the coating includes a main agent and an additive;

[0024] The main agent includes luminous powder and / or pigment, and the additive includes acrylic resin, a cross-linking agent and a surfactant.

[0025] Not only can the LCP resin sheet be directly used as the LCP imitation flocking dot material, but the LCP imitation flocking dot material provided by the present invention can also use the LCP resin sheet as a substrate, set a coating on its surface, and add luminous powder and / or pigment to the coating to achieve color, luminous, temperature-sensitive and photosensitive functional stacking integration. At the same time, the additives in the coating can enhance the adhesion of the luminous powder and / or pigment on the surface of the LCP resin sheet, thereby preparing LCP imitation flocking dot materials with customized color and functionality.

[0026] Preferably, the coating has a thickness of 10 to 60 nm, for example, 10 nm, 20 nm, 25 nm, 30 nm, 35 nm, 40 nm, 45 nm, 50 nm or 60 nm.

[0027] Preferably, the mass percentage of the main agent in the material of the coating is 45-55%, for example, 45%, 47%, 49%, 51%, 53% or 55%.

[0028] Preferably, the mass percentage of the additive in the material of the coating is 45-55%, for example, 45%, 47%, 49%, 51%, 53% or 55%.

[0029] Preferably, the mass ratio of the acrylic resin, the crosslinking agent and the surfactant is 1:(0.05-0.15):(0.01-0.03), for example, 1:0.05:0.01, 1:0.06:0.012, 1:0.08:0.014, 1:0.1:0.018, 1:0.11:0.02, 1:0.13:0.024, 1:0.14:0.028 or 1:0.15:0.03, etc.

[0030] Preferably, the luminous powder comprises rare earth doped strontium aluminate long afterglow luminescent powder; illustratively, the rare earth doped strontium aluminate long afterglow luminescent powder comprises SrAl 2 O 4 :Eu,Dy.

[0031] Preferably, the pigment comprises any one of titanium dioxide, bis(p-chlorophenyl)-1,4-diketopyrrolopyrrole, phthalocyanine blue 15:3 or 2-(3-hydroxy-2-quinolyl)-1,3-indanedione, or a combination of at least two thereof.

[0032] Preferably, the number average molecular weight of the acrylic resin is 75,000 to 120,000, for example, 75,000, 80,000, 90,000, 100,000, 110,000 or 120,000.

[0033] Preferably, the cross-linking agent includes a polyamine cross-linking agent and / or an acrylate cross-linking agent, and more preferably an acrylate cross-linking agent.

[0034] Preferably, the acrylate crosslinking agent includes 1,4-butylene glycol diacrylate.

[0035] Preferably, the surfactant includes a nonionic surfactant, and more preferably polyoxyethylene alcohol.

[0036] In a second aspect, the present invention provides a method for preparing the LCP flocking-like dot material as described in the first aspect, the preparation method comprising: melting the LCP resin and blowing it into a film, and then shearing the obtained LCP resin film to obtain the LCP flocking-like dot material.

[0037] Preferably, the preparation method specifically includes: melting the LCP resin, extruding it through a die to form a film bubble, introducing a gas medium into the film bubble to inflate the film bubble, cooling and shaping it through an air ring, and the film bubble is flattened and clamped after reaching the herringbone plate, and is pulled out and rolled to form an LCP resin film, and finally the obtained LCP resin film is sheared to obtain the LCP imitation flocking point material.

[0038] Preferably, the melting temperature is 290-330°C, for example, 290°C, 295°C, 300°C, 305°C, 310°C, 315°C, 320°C, 325°C or 330°C.

[0039] Preferably, the gaseous medium comprises compressed air.

[0040] Preferably, before shearing the obtained LCP resin film, the method further comprises the step of coating a coating slurry on the surface of the LCP resin film and drying the coating slurry.

[0041] Preferably, the coating slurry is obtained by mixing acrylic resin, a cross-linking agent and a surfactant in a solvent, and then adding luminous powder and / or pigment and mixing.

[0042] Preferably, the solvent includes a ketone solvent or an alcohol solvent, and butanone is further selected.

[0043] Preferably, the solid content of the mixed slurry obtained by mixing is 50-60%, for example, 50%, 52%, 54%, 56%, 58% or 60%.

[0044] In a third aspect, the present invention provides an application of the LCP imitation flocking dot material as described in the first aspect or the LCP imitation flocking dot material prepared by the preparation method as described in the second aspect in imitation flocking dots.

[0045] In a fourth aspect, the present invention provides a composition containing LCP flocking dots, which comprises the following components in parts by weight: 75 to 85 parts by weight of resin, 0 to 0.008 parts by weight of color powder, 0.0009 to 0.1 parts by weight of the LCP flocking dot material as described in the first aspect, and 0 to 30 parts by weight of filler.

[0046] Among them, the content of the resin can be 75 parts by weight, 76 parts by weight, 77 parts by weight, 78 parts by weight, 79 parts by weight, 80 parts by weight, 81 parts by weight, 82 parts by weight, 83 parts by weight, 84 parts by weight or 85 parts by weight, etc.; and the mass percentage of the resin in the composition containing LCP imitation flocking points is not less than 70%.

[0047] The content of the toner may be 0 parts by weight, 0.002 parts by weight, 0.003 parts by weight, 0.004 parts by weight, 0.005 parts by weight, 0.006 parts by weight, 0.007 parts by weight, 0.008 parts by weight, etc.

[0048] The content of the LCP imitating flocking dot material can be 0.0009 weight part, 0.0011 weight part, 0.002 weight part, 0.003 weight part, 0.004 weight part, 0.005 weight part, 0.006 weight part, 0.007 weight part, 0.008 weight part, 0.009 weight part, 0.01 weight part, 0.05 weight part, 0.1 weight part, 0.2 weight part, 0.3 weight part, 0.4 weight part, 0.5 weight part, 0.6 weight part, 0.7 weight part, 0.8 weight part or 0.9 weight part, etc. When the content of the LCP imitating flocking dot material in the composition of LCP imitating flocking dot is lower than the above-mentioned dosage range, the spot effect of the obtained composition will be reduced, and when the content of the LCP imitating flocking dot material in the composition of LCP imitating flocking dot is higher than the above-mentioned dosage range, the impact resistance of the obtained composition will be reduced.

[0049] The content of the filler can be 5 parts by weight, 10 parts by weight, 12 parts by weight, 14 parts by weight, 16 parts by weight, 18 parts by weight, 20 parts by weight, 22 parts by weight, 24 parts by weight, 26 parts by weight, 28 parts by weight or 30 parts by weight, etc.

[0050] Preferably, the resin includes any one of PP resin (polypropylene resin), ABS resin (acrylonitrile-styrene-butadiene copolymer), HIPS resin (high impact polystyrene) or PS resin (polystyrene resin) or a combination of at least two of them.

[0051] Preferably, the melt index of the resin is 1 to 1000 g / 10 min, for example, 1 g / 10 min, 5 g / 10 min, 10 g / 10 min, 20 g / 10 min, 50 g / 10 min, 100 g / 10 min, 500 g / 10 min or 1000 g / 10 min.

[0052] In the present invention, the test method of the melt index of the resin can be tested according to the method provided in ISO 1133-1:2022 standard.

[0053] In the present invention, there is no special requirement for the type of the toner, which can be selected according to the color required by the product. For example, the toner includes carbon black, iron oxide, zinc oxide, etc.

[0054] In the present invention, there is no special requirement for the type of the filler, and conventional fillers in the art can be selected, for example, the filler includes talc, silicon oxide, calcium carbonate, etc.

[0055] Preferably, the composition containing LCP imitation flocking dots also includes an antioxidant.

[0056] Preferably, the content of antioxidant in the composition containing LCP imitation flocking dots is 0.0005-0.002 parts by weight, for example, 0.0005 parts by weight, 0.0007 parts by weight, 0.0009 parts by weight, 0.0011 parts by weight, 0.0013 parts by weight, 0.0015 parts by weight, 0.0017 parts by weight, 0.0019 parts by weight or 0.002 parts by weight.

[0057] In a fifth aspect, the present invention provides a method for preparing the composition containing LCP flocking-like dots as described in the third aspect, the preparation method comprising: mixing the components, and extruding to obtain the composition containing LCP flocking-like dots.

[0058] In the present invention, there is no special requirement for the above-mentioned mixing and extrusion molding methods, and the conventional mixing and molding methods in the art can be used. However, in order to ensure that the various components are mixed more evenly, the final obtained composition containing LCP imitation flocking points has better mechanical properties and a higher flocking point emergence rate, it is preferably prepared according to the following steps:

[0059] (A1) mixing part of the resin, the color powder, the filler and optionally the antioxidant to obtain a mixture A;

[0060] Mixing the remaining resin with the LCP imitation flocking point material as described in the first aspect to obtain a mixture B;

[0061] (A2) The mixture A obtained in step (A1) is mainly fed, and the mixture B obtained is side fed, and extrusion molding is performed using a twin-screw extruder to obtain the composition containing the LCP imitation flocking dots.

[0062] Preferably, the partial resin in step (A1) accounts for 70-80% of the total mass of all resins, such as 70%, 72%, 74%, 76%, 78% or 80%.

[0063] Preferably, the mixing time of mixing part of the resin, color powder, filler and optionally antioxidant in step (A1) is 3 to 5 minutes, for example, 3 minutes, 3.2 minutes, 3.4 minutes, 3.6 minutes, 3.8 minutes, 4 minutes, 4.2 minutes, 4.4 minutes, 4.6 minutes, 4.8 minutes or 5 minutes.

[0064] Preferably, the mixing time of the remaining resin and the LCP imitation flocking point material as described in the first aspect in step (A2) is 2 to 3 minutes, for example, 2 minutes, 2.2 minutes, 2.4 minutes, 2.6 minutes, 2.8 minutes or 3 minutes.

[0065] Preferably, the extrusion molding temperature in step (A2) is 200-230°C, for example, 200°C, 205°C, 210°C, 215°C, 225°C or 230°C.

[0066] In a sixth aspect, the present invention provides an application of a composition containing LCP flocking dots as described in the fourth aspect or a composition containing LCP flocking dots prepared by the preparation method as described in the fifth aspect in automotive interior and exterior decoration, consumer electronic appearance parts or household appliance appearance parts.

[0067] Compared with the prior art, the present invention has the following beneficial effects:

[0068] The LCP imitation flocking dot material provided by the present invention comprises an LCP resin sheet prepared from an LCP resin. By selecting the LCP resin as the material, the obtained LCP imitation flocking dot material has the characteristics of low density, adjustable size and shape, and small amount. The LCP imitation flocking dot material is further added to the resin, which has a high flocking dot emergence rate and does not affect the mechanical properties of the resin itself, so that the obtained composition containing the LCP imitation flocking dots has excellent impact resistance while having a spot effect, and can be widely used in industries such as automotive interior and exterior decoration, home appliances and consumer electronics. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1 This is a physical picture of the composition containing LCP imitation flocking dots provided in Application Example 1;

[0070] Figure 2 This is a physical picture of the composition containing LCP imitation flocking dots provided in Comparative Application Example 1. DETAILED DESCRIPTION

[0071] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0072] The detailed information of some raw materials involved in the following specific implementation is as follows:

[0073] (1) LCP resin

[0074] LCP resin A: melting point 300°C, density 1.38 g / m 3 , purchased from Zhuhai Wantong Chemical Co., Ltd., brand name ViFLEX;

[0075] LCP resin B: melting point 330°C, density 1.40 g / m 3 , purchased from Zhuhai Wantong Chemical Co., Ltd., brand KFLC41-D;

[0076] LCP resin C: melting point 320°C, density 1.38 g / m 3 , purchased from Zhuhai Wantong Chemical Co., Ltd.), brand Vicryst R8400 NC001;

[0077] LCP resin D: melting point 285°C, density 1.40 g / m 3 , purchased from Sichuan Dongcai Technology Group Co., Ltd., brand A950RX;

[0078] LCP resin E: melting point 350°C, density 1.40 g / m 3 , purchased from Zhuhai Wantong Chemical Co., Ltd., brand KFLC12-D.

[0079] (2) Luminous powder

[0080] Rare earth doped strontium aluminate long afterglow luminescent powder: SrAl 2 O 4 :Eu, Dy, from Zhejiang Minghui Luminescent Technology Co., Ltd., brand MHG-4G.

[0081] (3) Pigments

[0082] Titanium dioxide: purchased from Guangzhou Yantai Industrial Co., Ltd., brand R210+;

[0083] Bis(p-chlorophenyl)-1,4-diketopyrrolopyrrole: purchased from BASF, brand: Red K3840SQ;

[0084] Phthalocyanine blue 15:3: purchased from Anhui Hesheng New Materials Co., Ltd., brand number BF1535.

[0085] (4) Additives

[0086] Acrylic resin: purchased from DIC, brand name ACRYDIWML-350;

[0087] Cross-linking agent: 1,4-butylene glycol diacrylate, purchased from Inokane;

[0088] Surfactant: polyoxyethylene alcohol, purchased from Inokane.

[0089] (5) Resin

[0090] PP resin: purchased from Borealis LyondellBasell Petrochemical Co., Ltd., brand PP EP548R;

[0091] ABS resin: purchased from Liaoning Jinfa Technology Co., Ltd., brand ABS KF-730;

[0092] HIPS resin: purchased from Guangzhou North Chemical Co., Ltd., the brand is HIPS 825 Panjin.

[0093] (6) Toner

[0094] Carbon black: purchased from Cabot, brand number M717.

[0095] (7) Filling

[0096] Talc: purchased from Haicheng Tianyuan Chemical Co., Ltd., brand name TYT-777A.

[0097] (8) Antioxidants

[0098] Antioxidant 1098: Hindered phenol antioxidant, purchased from Jinlianlong New Materials Co., Ltd., brand RIANOX 1098.

[0099] (9) Others

[0100] PET fiber dots: purchased from Changjin New Materials Co., Ltd., brand number C6241.

[0101] Example 1

[0102] An LCP imitation flocking dot material, comprising an LCP resin sheet made of LCP resin A, wherein the LCP resin sheet has a thickness of 50 nm, an irregular shape, a longest diameter of 1.5 mm, and a shortest diameter of 0.01 mm;

[0103] The preparation method of the LCP imitation flocking point material provided in this embodiment comprises the following steps:

[0104] LCP resin A is placed in an extruder, melted and plasticized at 320°C, extruded through a die to form a film bubble, compressed air is introduced into the film bubble to inflate the film bubble, and the film bubble is cooled and shaped by an air ring. After the film bubble reaches the herringbone plate, it is flattened and clamped, and is pulled out and rolled by a guide roller to obtain an LCP resin film, and then the obtained LCP resin film is sheared to obtain the LCP imitation flocking point material.

[0105] Example 2

[0106] An LCP imitation flocking dot material, comprising an LCP resin sheet made of LCP resin A, wherein the LCP resin sheet has a thickness of 65 nm, an irregular shape, a longest diameter of 2 mm, and a shortest diameter of 0.05 mm;

[0107] The preparation method of the LCP imitation flocking point material provided in this embodiment comprises the following steps:

[0108] LCP resin A is placed in an extruder, melted and plasticized at 320°C, extruded through a die to form a film bubble, compressed air is introduced into the film bubble to inflate the film bubble, and the film bubble is cooled and shaped by an air ring. After the film bubble reaches the herringbone plate, it is flattened and clamped, and is pulled out and rolled by a guide roller to obtain an LCP resin film, and then the obtained LCP resin film is sheared to obtain the LCP imitation flocking point material.

[0109] Example 3

[0110] An LCP imitation flocking dot material, comprising an LCP resin sheet made of LCP resin A, wherein the LCP resin sheet has a thickness of 40 nm, an irregular shape, a longest diameter of 1 mm, and a shortest diameter of 0.01 mm;

[0111] The preparation method of the LCP imitation flocking point material provided in this embodiment comprises the following steps:

[0112] LCP resin A is placed in an extruder, melted and plasticized at 320°C, extruded through a die to form a film bubble, compressed air is introduced into the film bubble to inflate the film bubble, and the film bubble is cooled and shaped by an air ring. After the film bubble reaches the herringbone plate, it is flattened and clamped, and is pulled out and rolled by a guide roller to obtain an LCP resin film, and then the obtained LCP resin film is sheared to obtain the LCP imitation flocking point material.

[0113] Example 4

[0114] A LCP imitation flocking dot material, which is different from Example 1 only in that LCP resin B is used to replace LCP resin A, and other substances, amounts and preparation methods are the same as those in Example 1.

[0115] Example 5

[0116] A LCP imitation flocking dot material, which is different from Example 1 only in that LCP resin C is used to replace LCP resin A, and other substances, amounts and preparation methods are the same as those in Example 1.

[0117] Example 6

[0118] A LCP imitation flocking dot material, which is different from Example 1 only in that LCP resin D is used to replace LCP resin A, and other substances, amounts and preparation methods are the same as those in Example 1.

[0119] Example 7

[0120] A LCP imitation flocking dot material, which is different from Example 1 only in that LCP resin E is used to replace LCP resin A, and other substances, amounts and preparation methods are the same as those in Example 1.

[0121] Example 8

[0122] A LCP imitation flocking dot material, which is different from Example 1 only in that the thickness of the LCP resin sheet is 40nm, and other substances, amounts and preparation methods are the same as those in Example 1.

[0123] Example 9

[0124] A LCP imitation flocking dot material, which is different from Example 1 only in that the thickness of the LCP resin sheet is 70nm, and other substances, amounts and preparation methods are the same as those in Example 1.

[0125] Example 10

[0126] A LCP imitation flocking dot material, which is different from Example 1 only in that the thickness of the LCP resin sheet is 25 nm, and other substances, amounts and preparation methods are the same as those in Example 1.

[0127] Embodiment 11

[0128] A LCP imitation flocking dot material, which is different from Example 1 only in that the thickness of the LCP resin sheet is 100 nm, and other substances, amounts and preparation methods are the same as those in Example 1.

[0129] Example 12

[0130] An LCP imitation flocking dot material, comprising an LCP resin sheet made of LCP resin A, and a coating attached to the surface of the LCP resin sheet;

[0131] Among them, the thickness of the LCP resin sheet is 50nm, and it is an irregular shape with a longest diameter of 1.5mm and a shortest diameter of 0.01mm;

[0132] The coating has a thickness of 35 nm, and the coating material includes 50% by mass of titanium dioxide and 50% by mass of an additive (composed of acrylic resin, a crosslinking agent and a surfactant in a mass ratio of 1:0.1:0.02);

[0133] The preparation method of the LCP imitation flocking point material provided in this embodiment comprises the following steps:

[0134] (1) dissolving an acrylic resin, a crosslinking agent and a surfactant in butanone to obtain a mixed slurry with a solid content of 55%, and then adding titanium dioxide to the obtained mixed slurry and mixing them to obtain a coating slurry;

[0135] The LCP resin A is placed in an extruder, melted and plasticized at 320°C, extruded through a die to form a film bubble, compressed air is introduced into the film bubble to inflate the film bubble, cooled and shaped by an air ring, and the film bubble is flattened and clamped after reaching the herringbone plate, and is pulled out and rolled up by a guide roller to obtain an LCP resin film;

[0136] (3) The coating slurry obtained in step (1) is uniformly coated on the surface of the LCP resin film obtained in step (1) by a screen printing machine, and the LCP flocking-like dot material is obtained after drying and shearing.

[0137] Application Examples 1 to 13

[0138] Application Examples 1 to 13 respectively provide a composition containing LCP imitation flocking dots, and the components and amounts of the components are shown in Table 1. In Table 1, the units of the amounts of the components are all "parts by weight";

[0139] Table 1

[0140]

[0141]

[0142] Among them, " / " means not added;

[0143] The preparation method of the composition containing LCP imitation flocking dots provided in Application Examples 1 to 13 comprises the following steps:

[0144] (1) Mixing 75% of the total mass of the resin, the color powder, the filler and the antioxidant for 4 minutes to obtain a mixture A;

[0145] The remaining 25% of the total mass of the resin and the LCP imitation flocking point material were mixed for 3 minutes to obtain a mixture B;

[0146] (2) The mixture A obtained in step (1) is mainly fed, and the mixture B obtained is side fed, and extrusion molding is performed at 220° C. using a twin-screw extruder to obtain the composition containing LCP imitation flocking points.

[0147] Comparative application example 1

[0148] A flocking dot composition is disclosed, which differs from Application Example 1 only in that mica sheets are used to replace the LCP flocking dot material provided in Example 1, and other substances, amounts used and preparation methods are the same as those in Application Example 1.

[0149] Comparative Application Example 2

[0150] A flocking-like dot composition, which differs from Application Example 1 only in that PET fiber dots are used to replace the LCP flocking-like dot material provided in Example 1, and other substances, amounts and preparation methods are the same as those in Application Example 1.

[0151] Appearance:

[0152] Visually observe the composition containing LCP flocking dots obtained in Application Example 1 and Comparative Application Example 1, and obtain the physical picture of the composition containing LCP flocking dots provided in Application Example 1 as shown in the figure. Figure 1 As shown, the physical picture of the composition containing LCP imitation flocking points provided in Comparative Application Example 1 is as shown Figure 2 As shown;

[0153] from Figure 1 and Figure 2 It can be seen from the comparison that the emergence rate of LCP imitation flocking points in the composition containing LCP imitation flocking points provided in Application Example 1 is significantly higher, and the surface distribution is very uniform, indicating that the contrast between the resin substrate and the LCP imitation flocking points is high, and even carbon black cannot cover the LCP imitation flocking points.

[0154] Performance Testing:

[0155] (1) Imitation flocking point emergence rate: Use Leica microscope V2rayN for analysis and testing; the specific testing method includes: first place the imitation flocking point under the microscope, take a photo with 6 times magnification, open the photo with IamgeJ software, and calculate the area S of a single imitation flocking point 单个 ; Then place the plastic part with imitation flocking dots to be tested under a microscope, adjust the magnification to 6 times, take a photo of the plastic part with imitation flocking dots to be tested, open the photo with ImageJ software, and calculate the number of imitation flocking dots n and the total area S of the imitation flocking dots contained by the software. 总 , the average area S of a single flocking point on the tested flocking point plastic part 浮现平均 =S 总 / n, then the flocking point emergence rate (%) Sd = 1 / n × SQRT [(S 浮现平均 -S 单个 ) 2 ]×100%.

[0156] (2) Deviation of average particle size of flocking dots: Place the tested flocking dots plastic part under a Leica microscope and adjust the magnification to 6 times. Take a photo of the tested flocking dots plastic part. Open the photo with ImageJ software and count the particle size of the flocking dots in the photo. The particle size of each flocking dot is D 1 , D 2 ...D n, and the particle size D of the original flocking point 0 Compare and use the formula Calculation is performed to obtain the average particle size deviation of the simulated flocking points in the simulated flocking point plastic part to be tested.

[0157] (3) Charpy notched impact strength: tested in accordance with ISO 179-1:2010, injection molding A-notch.

[0158] According to the above test method, the compositions containing LCP imitation flocking dots provided in Examples 1 to 13 and Comparative Application Example 1 were tested, and the test results are shown in Table 2;

[0159] Table 2

[0160]

[0161] From the data in Table 2, we can see that:

[0162] (1) The flocking point emergence rate of the LCP imitation flocking point composition provided in Application Examples 1 to 13 is ≥50%, the average particle size deviation of the imitation flocking point is ≤35%, and the impact strength is ≥16 kJ / m 2 , with both high flocking point emergence rate and high impact strength; in particular, the flocking point emergence rate of the composition containing LCP flocking points provided in Application Examples 1 to 5, Application Examples 8 to 9 and Application Examples 12 to 13 is ≥80%, the average particle size deviation of the flocking points is ≤12%, and the impact strength is ≥17.5 kJ / m 2 , the flocking point emergence rate and impact strength have reached the optimal level.

[0163] (2) From the data of comparative application examples 1 to 14 and comparative application examples 1 to 2, it can be seen that the emergence rate of the simulated flocking dots of the compositions made of mica flakes and PET fiber dots is very low, and the average particle size deviation of the simulated flocking dots is very large.

[0164] (3) By comparing the data between application examples 1 to 13, we can also find that:

[0165] ① When the melting point of the LCP flocking point is too low (Application Example 6), the flocking point emergence rate of the obtained composition containing the LCP flocking point is reduced and the average particle size deviation is deteriorated;

[0166] ② When the melting point of the LCP flocking point is too high (Application Example 7), although it has little effect on the flocking point emergence rate and average particle size deviation of the obtained composition containing LCP flocking points, it will lead to a slight decrease in impact resistance.

[0167] ③ If the thickness of the LCP resin sheet in the LCP imitation flocking dots is too low (Application Example 10), the imitation flocking dots will be soft as a whole, and the flocking dot emergence rate of the final composition containing LCP imitation flocking dots will be reduced, and the average particle size deviation will be worse.

[0168] ④ If the thickness of the LCP resin sheet in the LCP imitation flocking dots is too high (Application Example 11), the impact resistance of the final composition containing the LCP imitation flocking dots will decrease.

[0169] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A LCP imitation flocking point material, characterized in that: The LCP imitation flocking point material comprises an LCP resin sheet prepared from LCP resin; The melting point of the LCP resin is 280-400°C; The thickness of the LCP resin sheet is 25-100 nm.

2. The LCP imitation flocking point material according to claim 1, characterized in that: The melting point of the LCP resin is 290-340°C; Preferably, the thickness of the LCP resin sheet is 35-75 nm.

3. The LCP imitation flocking point material according to claim 1 or 2, characterized in that: The surface of the LCP resin sheet is also attached with a coating, and the material of the coating includes a main agent and an additive; The main agent includes luminous powder and / or pigment, and the additives include acrylic resin, cross-linking agent and surfactant; Preferably, the thickness of the coating is 10 to 60 nm; Preferably, the mass percentage of the main agent in the material of the coating is 45-55%; Preferably, the mass percentage of the additive in the coating material is 45-55%; Preferably, the mass ratio of the acrylic resin, the crosslinking agent and the surfactant is 1:(0.05-0.15):(0.01-0.03); Preferably, the luminous powder comprises rare earth doped strontium aluminate long afterglow luminescent powder; Preferably, the pigment comprises any one or a combination of at least two of titanium dioxide, bis(p-chlorophenyl)-1,4-diketopyrrolopyrrole, phthalocyanine blue 15:3 or 2-(3-hydroxy-2-quinolyl)-1,3-indanedione; Preferably, the cross-linking agent includes a polyamine cross-linking agent and / or an acrylate cross-linking agent, and more preferably an acrylate cross-linking agent; Preferably, the acrylate crosslinking agent includes 1,4-butylene glycol diacrylate; Preferably, the surfactant includes a nonionic surfactant, and more preferably polyoxyethylene alcohol.

4. A method for preparing the LCP imitation flocking dot material according to any one of claims 1 to 3, characterized in that: The preparation method comprises: melting LCP resin and blowing it into a film, and then shearing the obtained LCP resin film to obtain the LCP imitation flocking dot material.

5. The preparation method according to claim 4, characterized in that: The preparation method specifically comprises: firstly melting the LCP resin, and then extruding it through a die to form a film bubble, then introducing a gas medium into the film bubble to inflate the film bubble, and then cooling and shaping it through an air ring, and the film bubble is flattened and clamped after reaching the herringbone plate, and then pulled out and rolled to form an LCP resin film, and finally the obtained LCP resin film is sheared to obtain the LCP imitation flocking point material; Preferably, the melting temperature is 290-330°C; Preferably, the gaseous medium comprises compressed air; Preferably, before shearing the obtained LCP resin film, the method further comprises the step of coating a coating slurry on the surface of the LCP resin film and drying the coating slurry; Preferably, the coating slurry is obtained by mixing acrylic resin, a cross-linking agent and a surfactant in a solvent, and then adding luminous powder and / or pigment and mixing; Preferably, the solvent comprises a ketone solvent or an alcohol solvent, and butanone is further selected; Preferably, the solid content of the mixed slurry obtained by mixing is 50-60%.

6. Use of the LCP imitation flocking dot material as claimed in any one of claims 1 to 3 or the LCP imitation flocking dot material prepared by the preparation method as claimed in any one of claims 4 to 5 in imitation flocking dots.

7. A composition containing LCP imitation flocking dots, characterized in that: The composition containing LCP flocking dots comprises the following components in parts by weight: 75-85 parts by weight of resin, 0-0.008 parts by weight of color powder, 0.0009-0.1 parts by weight of the LCP flocking dot material according to any one of claims 1 to 3, and 0-30 parts by weight of filler.

8. The composition containing LCP imitation flocking dots according to claim 7, characterized in that: The resin includes any one of PP resin, ABS resin, GPPS resin or HIPS resin, or a combination of at least two thereof; Preferably, the composition containing LCP imitation flocking dots also includes an antioxidant; Preferably, the content of the antioxidant in the composition containing LCP imitation flocking dots is 0.0005 to 0.002 parts by weight.

9. A method for preparing a composition containing LCP imitation flocking dots as claimed in claim 7 or 8, characterized in that: The preparation method comprises: mixing the components and extruding them to obtain the composition containing LCP flocking dots.

10. Use of the composition containing LCP flocking dots as claimed in claim 7 or 8, or the composition containing LCP flocking dots obtained by the preparation method as claimed in claim 9 in automobile interior and exterior decoration, consumer electronic appearance parts or household appliance appearance parts.

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